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GB/T 23612-2017: PDF in English (GBT 23612-2017)
GB/T 23612-2017
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.220.01
H 61
Replacing GB/T 23612-2009
Technical Specification for Process of Anodizing and
Electrodeposition Painting on Aluminum Alloy
Extruded Profiles for Architecture
ISSUED ON: JULY 12, 2017
IMPLEMENTED ON: APRIL 1, 2018
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of
China.
Table of Contents
Foreword ... 3 
1 Scope ... 6 
2 Normative References ... 6 
3 Terms and Definitions ... 7 
4 Typical Process Flow Chart ... 7 
5 Equipment Requirements ... 8 
6 Quality Requirement of Mill Finish Profiles ... 13 
7 Manufacturing Process Requirements ... 13 
8 Monitoring of Process Parameters ... 22 
9 Product Quality Control ... 23 
Foreword
This Standard was drafted in accordance with the rules in GB/T 1.1-2009.
This Standard serves as a replacement of GB/T 23612-2009 Anodizing and
Electrophoretic Painting Technical Specification on Wrought Aluminum Alloy Extruded
Profiles for Architecture. In comparison with GB/T 23612-2009, except from editorial
modifications, there are several main technical changes as follows:
---The typical process flow chart is transferred to the space prior to equipment
requirements (please refer to Chapter 4; 6.1.5 in Version 2009);
---In the typical process flow chart on anodizing (Figure 1), a rinsing process is
added between neutralization and dyeing; a rinsing process is added between
hole sealing and cold sealing post-treatment. Direct connection to water rinsing
1 after electrolytic coloring through the process of anodizing without electrolytic
coloring is modified into direct connection to the process of hole sealing through
water rinsing 2 after the process of anodizing (please refer to Chapter 4; 6.1.5
in Version 2009);
---In the typical process flow chart on anodizing electrophoretic painting (Figure 2),
direct connection to water rinsing 1 after electrolytic coloring through the
process of anodizing without the process of electrolytic coloring is modified into
direct connection to hot water rising before electrophoretic painting through
water rinsing 2 after the process of anodizing (please refer to Chapter 4; 6.1.5
in Version 2009);
---The stipulations regarding the processing of groove materials are modified
(please refer to 5.1.1.2; 4.1.1.1 in Version 2009);
---The requirements towards anodizing electrolyte agitation equipment are
modified (please refer to 5.1.3; 4.1.3 in Version 2009);
---The requirements towards anodizing power supply are modified (please refer to
5.1.5.2; 4.1.5.2 in Version 2009);
---The requirements towards automatic fault diagnosis and protection system for
anodizing power supply unit are added (please refer to 5.1.5.3);
---The process of installing recovery unit is modified (please refer to 5.1.6.1;
4.1.6.1 in Version 2009);
---Recovery unit, which is recommended to be installed by the recyclable process,
is modified (please refer to 5.1.6.2; 4.1.6.2 in Version 2009);
---The stipulations of devices that waste-water treatment equipment shall be
equipped with are modified (please refer to 5.1.6.3; 4.1.6.3 in Version 2009);
---The requirements towards the cross-sectional area of aluminum hanger are
added (please refer to 5.1.7.2);
---The requirements towards hanger design are modified (please refer to 5.1.7.3;
4.1.7.2 in Version 2009);
---The requirements towards curing oven are modified (please refer to 5.1.8; 4.1.8
in Version 2009);
---The requirements towards suitable materials for conductive cathode plate are
modified (please refer to 5.1.9.1; 4.1.9.1 in Version 2009);
---The stipulations regarding workshop air cleaning unit are modified (please refer
to 5.1.10; 4.1.10 in Version 2009);
---The inspection equipment used for the inspection item “abrasive resistance” in
Table 1 is modified (please refer to 5.2; 4.2 in Version 2009);
---The requirement that water rinsing tank should consider the cyclic utilization of
water is added (please refer to 7.1.4);
---The requirement of water rinsing treatment before anodizing is added (please
refer to 7.1.5);
---The requirement of water rinsing treatment after anodizing is added (please
refer to 7.1.6);
---The stipulations of Ni2+ treatment in nickel-containing waste-water are added
(please refer to 7.1.8);
---Some process parameters in Table 2 are modified (please refer to 7.1.8; 6.1.5
in Version 2009);
---The stipulation that ash-removal solution should not contain fluorine-containing
ions, hexavalent chromium ions or other detrimental heavy metal ions is added
(please refer to 7.2.3.3);
---The stipulation that “the process of electrolytic coloring should adopt mono-
nickel salt coloring process, which is equipped with nickel recovery unit” is
added (please refer to 7.4.2);
---The stipulation that “the hole-sealing process should gradually develop from
nickel-containing and fluorine-containing cold hole-sealing process or medium-
temperature hole-sealing process into nickel-free and fluorine-free cold hole-
sealing process or medium-temperature hole-sealing process; it may also
develop into thermal hole-sealing process” is added (please refer to 7.5.1.2);
---The stipulation of medium-temperature hole-sealing process is modified (please
refer to 7.5.3; 6.5.3 in Version 2009);
---The stipulation of the influence of excessive solid fraction on painting is modified
(please refer to 7.6.2; 6.6.1 in Version 2009);
---The stipulation of the influence of electrophoresis voltage on painting is modified
(please refer to 7.6.5; 6.6.4 in Version 2009);
---The influence when the cathode-anode area ratio is inappropriate is modified
(please refer to 7.6.7; 6.6.6 in Version 2009).
This Standard was proposed by China Nonferrous Metals Industry Association.
This Standard shall be under the jurisdiction of National Technical Committee 243 on
Nonferrous Metals of Standardization Administration of China (SAC/TC 243).
The drafting organizations of this Standard: Guangdong JMA Aluminum Profile Factory
(Group) Co., Ltd., Fine Chemicals Group Co., Ltd., China Nonferrous Metals Techno-
Economic Research Institute, Tianjin New AL-ONE Tech Co., Ltd., Guangdong
HAOMEI Aluminum Co., Ltd., Guangdong FENGLU Aluminum Co., Ltd., Fujian MINFA
Aluminum Inc., Fujian Nanping Aluminum Co., Ltd., Guangdong XINGFA Aluminum
Holdings Limited, Guangdong Xinhe Aluminum Co., Ltd., Foshan Nanhai Huahao
Aluminum Profile Co., Ltd., Guangdong Huachang Aluminum Factory Co., Ltd.
The main drafters of this Standard: Dai Yuexing, Jin Honghai, Ge Lixin, Shi Hongwei,
Xiang Shengqian, Chenhui, Zhu Yaohui, Xie Zhijun, Chen Wensi, Xiang Wenhua, Zhu
Shuiming, Tang Xingyu.
The issuance of the previous versions of the standard being replaced by this Standard
is as follows:
---GB/T 23612-2009.
Technical Specification for Process of Anodizing and
Electrophoretic Painting on Aluminum Alloy Extruded
Profiles for Architecture
1 Scope
This Standard stipulates the terms, definitions, typical process flow chart, equipment
requirements, quality requirement of mill finish profiles, manufacturing process
requirements, process parameter control and product quality control of the technical
specification for process of anodizing and electrophoretic painting on aluminum alloy
extruded profiles for architecture.
This Standard is applicable to the manufacturing process for the processing of
anodizing or anodizing electrophoretic painting (water-soluble varnish or colored
painting) on the surface of aluminum alloy extruded profiles for architecture.
2 Normative References
The following documents are indispensable to the application of this document. In
terms of references with a specific date, only versions with a specific date are
applicable to this document. In terms of references without a specific date, the latest
versions (including all the modification lists) are applicable to this document.
GB/T 4957 Non-conductive Coatings on Non-magnetic Basis Metals - Measurement
of Coating Thickness - Eddy Current
GB/T 5237.1 Wrought Aluminum Alloy Extruded Profiles for Architecture - Part 1: Mill
Finish Profiles
GB/T 5237.2 Wrought Aluminum Alloy Extruded Profiles for Architecture - Part 2:
Anodized Colored Profiles
GB/T 5237.3 Wrought Aluminum Alloy Extruded Profiles for Architecture - Part 3:
Electrophoretic Coating Profiles
GB/T 8005.3 Aluminum and Aluminum Alloys - Terms and Definitions - Part 3: Surface
Treatment
GB/T 9286 Paints and Varnishes - Cross Cut Test for Films
3 Terms and Definitions
Terms and definitions defined in GB/T 8005.3 are applicable to this document.
4 Typical Process Flow Chart
Typical process flow chart on anodizing is shown in Figure 1. Typical process flow chart
on anodizing electrophoretic painting is shown in Figure 2.
Figure 1 -- Typical Process Flow Chart on Anodizing
Water
Rinsing 7
Water
Rinsing 8
Water
Rinsing 1
Water
Rinsing 2
Water
Rinsing 3
Water
Rinsing 4
Water
Rinsing 5
Water
Rinsing 6
Water
Rinsing 9
Water
Rinsing 10
Water
Rinsing 14
Water
Rinsing 15
Water
Rinsing 12
Water
Rinsing 11
Water
Rinsing 13
Hole-
sealing
Ash-
removal
Post-cold-hole-
sealing Treatment
Dyeing
Anodizing
Degreasing
Electrolytic
Coloring
Neutralizati
on
Load Mill
Finish Profile
Unload Profile
Alkali
Rinsing
Figure 2 -- Typical Process Flow Chart on Anodizing Electrophoretic Painting
5 Equipment Requirements
5.1 Manufacturing Equipment
5.1.1 Processing tank
5.1.1.1 Type of processing tank
Processing tank includes pretreatment tank (including degreasing tank, alkali rinsing
tank and dust-removal tank), anodizing tank, electrolytic coloring tank, neutralization
tank, dyeing tank, hole-sealing tank, post-cold-hole-sealing processing tank,
electrophoretic painting tank and water rinsing tank, etc.
5.1.1.2 Materials and layout of processing tank
The lining material that the processing tank adopts shall not be corroded or
contaminated by tank solution. The layout of the processing tank shall be reasonable.
It shall prevent tank solution from being contaminated.
5.1.1.3 Capacity of processing tank
The capacity of the processing tank shall satisfy the requirements of manufacturing. In
addition, it shall guarantee that the requirements of process parameters (such as
Water
Rinsing 7
Water
Rinsing 8
Water
Rinsing 1
Water
Rinsing 2
Water
Rinsing 3
Water
Rinsing 4
Water
Rinsing 9
Water
Rinsing 5
Water
Rinsing 6
Water
Rinsing 10
Water
Rinsing 11
Water
Rinsing 12 Cooling
Alkali
Rinsing
Ash-
removal
Hot Water
Rinsing
Anodizing
Load Mill
Finish Profile
Unload Profile
Degreasing
Pure Water
Rinsing
Curing Drip-dry Electrophoretic Painting
Electrolytic
Coloring
electric current density and temperature) are satisfied.
5.1.2 Cooling equipment of anodizing electrolyte
Cooling equipment shall be able to absorb the heat generated during the electrolytic
process and guarantee that the requirements of process temperature are satisfied.
Under the circumstance of normal manufacturing, the equipment’s cooling capacity
should reach the requirement in Formula (1):
Where,
K---cooling capacity, expressed in (J/h);
I---maximum current, expressed in (A);
V---maximum voltage, expressed in (V).
5.1.3 Agitation equipment of anodizing electrolyte
Anodizing electrolyte shall be properly agitated, so as to reach the effect of heat
dissipation, and guarantee that the temperature of the electrolyte maintains uniformly
stable. Generally speaking, the mode of agitation shall adopt Roots blower air agitation,
circulating pump agitation, or a combination of Roots blower air agitation and
circulating pump agitation. When air agitation is adopted, the air for agitation shall
contain no grease; the amount of air agitation for each square meter of electrolyte
surface area shall be not less than 5 m3/h, and preferably 12 m3/h. When circulating
pump agitation is adopted, the circulating capability of the circulatory system shall be
2.5 ~ 4.0 times of the volume of the electrolyte per hour.
5.1.4 Heating equipment
In order to guarantee that the tank solution’s manufacturing temperature reaches the
process requirements, heating equipment shall be installed on processing tank which
needs to be heated. In addition, the heating capability of the heating equipment is
requested to guarantee that the tank solution’s temperature is controlled within the
range of the process requirements.
5.1.5 Power supply equipment
5.1.5.1 Power supply equipment shall satisfy the manufacturing requirements. Power
supply equipment shall install corresponding voltmeter and ampere meter. The
minimum scale of the voltmeter shall be not more than 2% of the nominal value; the
minimum scale of the ampere meter shall be not more than 5% of the nominal value.
Furthermore, the voltmeter and ampere meter need to be validated and calibrated in
accordance with the stipulated cycle of validation and calibration; the level of accuracy
shall reach Level-1.5.
5.1.5.2 Generally speaking, anodizing power supply shall adopt direct current (DC)
oxidizing power supply. Under general circumstances, silicon-controlled rectifier (SCR)
or rectifier controlled by sliding brush automatic transformer is adopted to provide direct
current in industry. The voltage drop from the anodizing power supply to tank-side
busbar shall be not more than 0.3 V. The temperature rise at the conductive contact
between the anode beam and the conductive seat shall be not more than 30 °C.
5.1.5.3 Anodizing power supply unit shall be equipped with an automatic fault
diagnosis and protection system against overcurrent, default phase, output short circuit
and equipment overtemperature, so as to guarantee equipment’s safe operation.
5.1.5.4 Electrophoretic painting’s DC power supply unit shall be equipped with an
automatic fault diagnosis and protection system against overcurrent, default phase,
output short circuit and equipment overtemperature, so as to guarantee equipment’s
safe operation. The ripple coefficient shall be less than 5%.
5.1.6 Recovery unit and waste-water treatment unit
5.1.6.1 Electrophoretic painting process and mono-nickel salt coloring process shall
install recovery unit.
5.1.6.2 Processes that implement recycling, such as anodizing pretreatment process
and anodizing process, should install recovery unit (such as sulfuric acid recovery unit,
alkali recovery unit and secondary water utilization unit, etc.).
5.1.6.3 When waste-water is handled by manufacturers, anodizing profile
manufacturers shall be equipped with corresponding waste-water treatment equipment
(treatment devices like acid-base neutralization, flocculation, sedimentation and filter
pressing). Anodizing electrophoretic painting profile manufacturers shall also be
equipped with COD treatment unit (for example, elimination of COD through ozone or
biological algae).
5.1.7 Hanger
5.1.7.1 Hanger shall have favorable electrical conductivity, so as to guarantee the
satisfying and uniform conduction of working current to each aluminum alloy profile for
architecture.
5.1.7.2 The cross-sectional area of aluminum hanger, which is soaked into the
anodizing tank solution, shall be sufficiently large, so as to guarantee that in normal
operation, the aluminum hanger’s electric current density shall be not more than 5
A/mm2.
5.1.7.3 In the design of hanger, cross contamination among tank solutions shall be
prevented.
5.1.8 Curing oven
5.1.8.1 Curing oven shall install temperature controller. The temperature controller
shall be able to directly display temperature data inside the oven. The heating zone of
the curing oven shall install an overtemperature alarming system.
5.1.8.2 Under normal operation, the temperature difference of the curing oven should
not be higher than 20 °C.
5.1.8.3 Curing oven’s operating temperature range shall satisfy the requirement of
painting curing temperature.
5.1.9 Conductive cathode plate
5.1.9.1 Conductive cathode plate shall select suitable materials. For instance,
anodizing cathode plate may select pure aluminum plate; electrolytic coloring cathode
plate may select pure nickel plate or stainless-steel plate; electrophoretic cathode plate
may select stainless-steel plate.
5.1.9.2 The surface area of the conductive cathode plate shall match with the designed
and processed profile area, and the rated processing capacity of the rectifier.
5.1.9.3 The conductive cathode plate shall be reasonably arranged, so as to guarantee
that electric current is uniformly distributed.
5.1.9.4 Anodizing and electrophoretic cathode plate shall be equipped with an
electrode cover.
5.1.10 Workshop air cleaning unit
In zones of pretreatment process, anodizing treatment process, electrophoretic
painting process and curing process, air ventilation and purification facilities shall be
installed, so as to guarantee the internal environment in the workshop and avoid
contamination of air.
5.2 Inspection Equipment
In accordance with different inspection items, inspection equipment shall be divided
into instruments and equipment for daily inspection, and instruments and equipment
for periodical inspection. Please refer to Table 1 for details.
Table 1 -- Instruments and Equipment for Daily Inspection; Instruments and
Equipment for Periodical Inspection
Classification
of Instruments
and Equipment
Inspection
Items
Analytical Instruments
and Inspection
Equipment
Remarks
Instruments
and Equipment
for Daily
Tank Solution
Analysis
Analytical balance,
constant-temperature
drying oven, acid
The division value of analytical
balance is 0.0001 g.
Inspection burette, alkali burette,
transfer pipette,
volumetric flask,
acidimeter, ion meter
and conductometer, etc.
Film Thickness Eddy current thickness meter
1. The measurement range of eddy
current thickness meter shall be not
less than the range of coating
thickness;
2. The accuracy requirement of
eddy current thickness meter shall
reach the stipulations in GB/T 4957.
Hole-sealing
Quality
Constant-temperature
water bath kettle or
constant-temperature
kettle, analytical
balance, constant-
temperature drying oven
The temperature-control sensitivity
of constant-temperature drying
oven, constant-temperature water
bath kettle or constant-temperature
kettle shall be  1 °C.
Painting
Hardness
High-grade drawing
pencil
This is a requisite inspection
equipment for anodizing
electrophoretic painting factories. It
is unnecessary in factories with
merely anodizing treatment.
Painting
Adhesiveness
Cross cutter, adhesive
tape
1. Cross cutter and adhesive tape
shall comply with the stipulations in
GB/T 9286; blade spacing of the
cross cutter shall be 1 mm;
2. Cross cutter is a requisite
inspection equipment for anodizing
electrophoretic painting factories. It
is unnecessary in factories with
merely anodizing treatment.
Instruments
and Equipment
for Periodical
Inspection
Weather
Resistance
Fluorescent UV lamp
artificially accelerated
weather resistance
meter and (or) xenon
lamp artificially
accelerated weather
resistance meter
Abrasive
Resistance
Falling sand tester or
abrasive blasting tester 
Salt Spray
Corrosion
Resistance
Salt spray test chamber 
Curing Oven
Temperature
Curve
Oven temperature
tracker
1. The measurement range of oven
temperature tracker shall be more
than the range of coating curing
temperature;
2. Generally speaking, oven
temperature tracker needs at least 4
temperature measurement lines: 1
of them measures air temperature;
the other 3 lines measure the actual
temperature of profile in 3 parts
inside the oven: the top, the middle
and the bottom.
6 Quality Requirement of Mill Finish Profiles
The quality of mill finish profiles shall comply with the stipulations in GB/T 5237.1.
7 Manufacturing Process Requirements
7.1 General Requirements
7.1.1 When loading mill finish profiles, there shall be an appropriate spacing among
the mill finish profiles, so as to guarantee that the anodizing oxide film is homogeneous.
7.1.2 When loading mill finish profiles in horizontal production lines, there shall be a
certain inclination, which should be controlled at around 5°.
7.1.3 After each processing (pretreatment, anodizing treatment, coloring processing,
hole-sealing processing and electrophoretic painting processing), water rinsing shall
be conducted at least once. Some processing steps shall receive several times of
water rinsing, for example, after alkali rinsing, anodizing treatment and electrolytic
coloring treatment, water rinsing shall be conducted at least twice. Some water rinsing
processes shall adopt deionized water. For example, before electrophoretic painting,
deionized water, whose conductivity measured at 20 °C is less than, or equals to 30
μs/cm, should be adopted for rinsing. When condition allows, water in the water rinsing
tank shall be filtered.
7.1.4 Cyclic utilization of water in the water rinsing tank should be taken into
consideration.
7.1.5 Before anodizing treatment, the retention time of profiles, which have finished
pretreatment, in the water rinsing tank should not be more than 30 min.
7.1.6 After anodizing treatment is finished, the profiles shall be placed into the water
rinsing tank for water rinsing in time. After water rinsing is finished, the profiles shall be
placed into the coloring tank for coloring treatment, so as to guarantee the uniformity
of the applied colors.
7.1.7 When profiles in the horizontal production line are hanged into and hanged out
of the tank solution, they shall be in a certain inclination. The degree of inclination
should be controlled at around 30°.
7.1.8 In terms of water rinsing tank after nickel salt-containing coloring treatment and
nickel-containing hole-sealing treatment, an exclusive drainage pipe shall be set up.
After collection, Ni2+ in the waste-water shall be separately handled.
7.1.9 Please refer to Table 2 for the typical process of anodizing and anodizing
electrophoretic painting.
Table 2 -- Typical Process of Anodizing and Anodizing Electrophoretic Painting
No. Process Treatment Time
Tank Solution
Composition
Temperatur
e Remarks
1 Degreasing
Determine in
accordance
with surface
requirements
Stipulate in
accordance with
degreasing agent
suppliers’
requirements
Room
temperature
Anodized
“waste acid”
may be
adopted
2 Water Rinsing 1 0.5 min ~ 2 min Tap water
Room
temperature pH > 2
3 Water Rinsing 2 0.5 min ~ 2 min Tap water
Room
temperature pH > 4
4 Alkali Rinsing
Determine in
accordance
with surface
requirements
30 g/L ~ 60 g/L
sodium hydroxide
40 °C ~
60 °C 
5 Water Rinsing 1 0.5 min ~ 2 min Tap water
Room
temperature 
6 Water Rinsing 2 0.5 min ~ 2 min Tap water
Room
temperature 
7 Ash-removal
2 min ~ 5 min
130 g/L ~ 225 g/L
sulfuric acid (free
sulfuric acid)
Room
temperature
Anodized
“waste acid”
may be
adopted
1 min ~ 5 min
5 g/L ~ 20 g/L nitric
acid, 130 g/L ~ 225
g/L sulfuric acid
(free sulfuric acid)
Room
temperature 
8 Water Rinsing 1 0.5 min ~ 2 min Tap water
Room
temperature 
9 Water Rinsing 2 0.5 min ~ 2 Tap water Room pH > 4
min temperature
10 Anodizing
Determine in
accordance
with film
thickness,
generally: 20
min ~ 60 min
130 g/L ~ 200 g/L
sulfuric acid (free
sulfuric acid),
aluminum ion
concentration is 5
g/L ~ 20 g/L
20 °C 
2 °C
Anodizing
voltage: 10
V ~ 20 V;
Electric
current
density: 100
A/m2 ~ 200
A/m2
11 Water Rinsing 1 0.5 min ~ 2 min Tap water
Room
temperature 
12 Water Rinsing 2 0.5 min ~ 2 min Tap water
Room
temperature pH > 4
13 Neutralization 3 min ~ 5 min 20 g/L sodium bicarbonate
Room
temperature
Exclusively
set up for
dyeing. If it
is
electrolytic
coloring,
this process
may be
cancelled
14 Water Rinsing 0.5 min ~ 2 min Tap water
Room
temperature 
15 Coloring
Dyeing
Determine in
accordance
with color,
generally: 1
min ~ 10 min
10 g/L ~ 20 g/L
dyeing into golden
yellow with ferric
ammonium oxalate
or ferric sodium
oxalate, or
determine in
accordance with the
suppliers’ technical
requirements
40 °C ~
55 °C
pH value:
4.0 ~ 5.5
Electrolytic
Coloring
Determine in
accordance
with color
depth
150 g/L  5 g/L
nickel sulfate, 40
g/L  5 g/L boric
acid
25 °C 
3 °C
pH value:
3.8 ~ 4.2
50 g/L  5 g/L nickel
sulfate, 30 g/L  5
g/L boric acid
25 °C 
3 °C
pH value:
3.8 ~ 4.2
16 Water Rinsing 1 0.5 min ~ 2 min Tap water
Room
temperature 
17 Water Rinsing 2 0.5 min ~ 2 Deionized water Room 
min temperature
18 Hole-sealing
Therm
al
Hole-
sealing
Boiling
Water
Sealing
Calculate by 2
min/μm ~ 3
min/μm
Deionized water Above 96 °C
pH value: 5
~ 8
High-
temper
ature
Vapor
Sealing
10 min ~ 15
min Deionized water
100 °C ~
110 °C
Vapor
pressure
81,060 Pa ~
101,325 Pa
Medium-
temperature
Sealing
Determine in
accordance
with sealant
suppliers’
technical
requirements
Determine in
accordance with
sealant suppliers’
technical
requirements
40 °C ~
80 °C 
Cold Sealing
Calculate by
0.8 min/μm ~
1.2 min/μm
Nickel ion
concentration is 0.8
g/L ~ 2.0 g/L;
fluorine ion
concentration is 0.3
g/L ~ 0.8 g/L
18 °C ~
32 °C
pH value:
5.5 ~ 6.5
19 Post-cold-hole-sealing Treatment
Calculate by
0.8 min/μm ~
1.2 min/μm
Deionized water 60 °C ~ 80 °C
Before
post-cold
hole-
sealing,
hole-sealing
solution
attached to
profiles
shall be
thoroughly
rinsed
Calculate by
0.8 min/μm ~
1.2 min/μm
Nickel sulfate
concentration is 5
g/L ~ 10 g/L
Not lower
than 60 °C
20 Hot Water Rinsing 1 3 min ~ 6 min Deionized water 70 °C ~ 80 °C
pH value: 4
~ 6
21 Pure Water Rinsing 2 2 min ~ 4 min Deionized water Room temperature
pH value: 5
~ 6
22 Electrophoretic Painting 2 min ~ 4 min
Acrylic acid series
of electrophoretic
painting solid
fraction: 3% ~ 12%
18 °C ~
25 °C
pH value:
7.0 ~ 8.5,
interelectro
de distance,
500 mm ~
700 mm,
electrode
ratio: 0.5 ~
1.0
23 Water Rinsing 1 0.5 min ~ 3 min Deionized water
Room
temperature 
24 Water Rinsing 2 0.5 min ~ 3 min Deionized water
Room
temperature 
25 Drip-dry Determine in accordance with electrophoretic painting suppliers’ requirements
26 Curing Determine in accordance with electrophoretic painting suppliers’ requirements
7.2 Anodizing Pretreatment
7.2.1 Degreasing
7.2.1.1 Before anodizing treatment, degreasing treatment shall be conducted. The
objective of degreasing is to eliminate grease on the surface of aluminum, so as to
guarantee uniform effect on the surface of the profiles after alkali rinsing; reduce
greasy dirt’s contamination of the alkali rinsing tank solution. Thus, the quality of
anodizing will be enhanced.
7.2.1.2 Degreasing treatment may select appropriate degreasing agent (for example,
sulfuric acid solution).
7.2.1.3 Degreasing treatment may adopt the method of spraying or impregnation.
7.2.1.4 The concentration of tank solution shall comply with the technical requirements
provided by degreasing agent suppliers. Please refer to Table 2 for the typical process
of degreasing treatment.
7.2.2 Alkali rinsing
7.2.2.1 The objective of alkali rinsing is to eliminate natural oxide film on the surface of
aluminum and further eliminate greasy dirt. Alkali rinsing is a critical process which
affects the surfac......

BASIC DATA
Standard ID GB/T 23612-2017 (GB/T23612-2017)
Description (Translated English) Technical specification for process of anodizing and electrodeposition painting on aluminium alloy extruded profiles for architecture
Sector / Industry National Standard (Recommended)
Classification of Chinese Standard H61
Classification of International Standard 25.220.01
Word Count Estimation 14,188
Date of Issue 2017-07-12
Date of Implementation 2018-04-01
Older Standard (superseded by this standard) GB/T 23612-2009
Quoted Standard GB/T 4957; GB/T 5237.1; GB/T 5237.2; GB/T 5237.3; GB/T 8005.3; GB/T 9286
Drafting Organization Guangdong Jianmei Aluminum Industry Co., Ltd., Fine Chemicals Group Co., Ltd., Nonferrous Metals Technology and Economic Research Institute, Tianjin Development Zone Alon Chemical Technology Co., Ltd., Guangdong Hao Mei Aluminum Co., Ltd., Guangdong Feng Aluminum Aluminum Co., Ltd. Fujian Minfa Aluminum Industry Co., Ltd., Fujian Nanping Aluminum Industry Co., Ltd., Guangdong Hing Fat Aluminum Co., Ltd., Guangdong Xinhe Aluminum Industry Emerging Co., Ltd., Foshan Nanhai Huahao Aluminum Co., Ltd., Guangdong Huachang Aluminum Co., Ltd
Administrative Organization National Standardization Technical Committee for Nonferrous Metals (SAC / TC 243)
Proposing organization China Nonferrous Metals Industry Association
Issuing agency(ies) General Administration of Quality Supervision, Inspection and Quarantine of the People Republic of China, China National Standardization Administration Committee
Summary This standard specifies the terms and definitions of the technical specifications of anodic oxidation and anodic electrodeposition of aluminum alloy building profiles, typical process flow chart, equipment requirements, substrate quality requirements, production process requirements, process parameter control and product quality control. This standard applies to the aluminum alloy construction profiles by anodizing or anodizing electrophoretic paint (water-soluble varnish or paint) treatment of the production process.