HG/T 3952-2007 PDF English
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| HG/T 3952-2007 | English | 150 |
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HG/T 3952-2007: Cathodic Electrodeposition Coatings---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/HGT3952-2007
HG
CHEMICAL INDUSTRY STANDARD
OF THE PEOPLE’S REPUBLIC OF CHINA
ICS 87.040
G 51
Record No.. 21393-2007
Cathodic Electrodeposition Coatings
Issued on: JULY 20, 2007
Implemented on: JANUARY 01, 2008
Issued by. National Development and Reform Commission of PRC
3. No action is required - Full-copy of this standard will be automatically &
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Table of Contents
Foreword ... 3
1 Scope .. 4
2 Normative References ... 4
3 Product Classification ... 5
4 Requirements ... 6
5 Test Methods .. 7
6 Inspection Rules ... 19
7 Marking, Package and Storage ... 19
Appendix A (Normative) Determination of the Throwing Power (Ford Box
Method) ... 21
Appendix B (Normative) Determination of the Solvent Content ... 24
Bibliography ... 28
Foreword
The Appendix A and Appendix B of this Standard are normative.
This Standard was proposed by China Petroleum and Chemical Industry Federation.
This Standard shall be under the jurisdiction of National Technical Committee of Paints
& Pigments for Standardization.
Drafting organizations of this Standard. Paint & Coating Chemical Industry Research
Institute of CNCCC, China FAW Group Corporation R&D Center, PPG Coatings
(Tianjin) Co., Ltd., Hunan Kansai Automotive Coatings Co., Ltd., Jiangsu Hongye
Coatings Science-Technology Industry Co., Ltd., Nippon Paint (China) Co., Ltd.,
Wuhan Twin-Tigers Coatings Group Co., Ltd., Jiujiang Plant of Changhe Automobile
Co., Ltd., Hangzhou Youli Chemical Co., Ltd., and Kunshan Shiming Technical
Development Co., Ltd.
Chief drafting staffs of this Standard. Tang Ying, Song Hua, Wang Hua, Li Jian, Fang
Jixiang, Liang Yabin, Fang Liming, Liu Jing, Peng Songhe, Wang Songxian, Shi Yilei,
and Yu Bin.
This Standard was first-time published.
This Standard was entrusted to National Technical Committee of Paints & Pigments
for interpretation.
Cathodic Electrodeposition Coatings
1 Scope
This Standard specifies the classification requirements, test methods, inspection rules,
marking, package and storage, etc. of the cathodic electrodeposition coatings.
This Standard is applicable to the cathodic electrodeposition coatings with epoxy resin
as the main film former.
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments
(excluding corrigendum) or revisions do not apply to this Standard, however, parties
who reach an agreement based on this Standard are encouraged to study if the latest
versions of these documents are applicable. For undated references, the latest edition
of the referenced document applies.
GB/T 1250 Rules for Expression and Judgement of Limiting Values
GB/T 1724 Methods of Test for Fineness of Grind of Paints
GB/T 1731-1993 Determination of Flexibility of Films
GB/T 1732-1993 Determination of Impact Resistance of Film
GB/T 1740 Determination of Resistance to Heat and Humidity of Paint Films
GB/T 1766 Paints and Varnishes – Rating Schemes of Degradation of Coats
GB/T 1771 Paints and Varnishes – Determination of Resistance to Neutral Salt
Spray (GB/T 1771-1991, eqv ISO 7253.1984)
GB/T 6751 Paints and Varnishes – Determination of Volatile and Non-Volatile
Matter (GB/T 6751-1986, eqv ISO 1515.1973)
GB/T 9271 Paints and Varnishes – Standard Panels for Testing (GB/T 9271-1988,
eqv ISO 1514.1984)
GB/T 9274-1988 Paints and Varnishes – Determination of Resistance to Liquids
(eqv ISO 2812.1974)
GB 9278 Temperature and Humidity for Conditioning and Testing of Paint
Specimens (GB 9278-1988, eqv ISO 3270.1984, Pains and Varnishes and Their
Raw Materials – Temperature and humidity for Conditioning and Testing)
GB/T 9286-1998 Pains and Varnishes – Cross Cut Test for Films (eqv ISO
2409.1992)
GB/T 9750 Marks for Package of Coating Products
GB/T 9753 Paints and Varnishes – Cupping Test (GB/T 9753-1988, eqv ISO
1520.1973)
GB/T 13452.1-1992 Paints and Varnishes - Determination of Total Lead - Flame
Atomic Absorption Spectrometric Method (eqv ISO 6503.1984)
GB/T 13491 General Rule for Packing of Coatings
GB 17930 Unleaded Petrol (Gasoline) for Motor Vehicles
HG/T 3792-2005 Crosslinking Fluorocarbon Resin Coatings
ISO 15184.1998 Paints and Varnishes – Determination of Film Hardness by Pencil
Test
ISO 15528.2000 Paints, Varnishes and Raw Materials for Paints and Varnishes –
Sampling
ISO 15580.2000 Paints, Varnishes and Binders – Determination of MEQ Value of
Water-Based Coating Materials and Binders
ASTM D1654-2005 Standard Test Method for Evaluation of Painted and Coated
Specimens Subjected to Corrosive Environments
3 Product Classification
The cathodic electrodeposition coatings can be divided into 4 classes according to the
main application areas in this Standard. Class-A is the cathodic electrodeposition
coatings for commercial vehicles (buses, trucks); Class-B is the cathodic
electrodeposition coatings for passenger cars (small cars with less than 9 seats);
Class-C is cathodic electrodeposition coatings for automotive parts; Class-D is
cathodic electrodeposition coatings for motorcycle, household appliances hardware
and light industrial products, etc. The cathodic electrodeposition coatings for
agricultural vehicles, construction machinery and the like vehicles can refer to Class-
A.
requirements.
5.2 Test environment
The test board conditioning and test temperature shall conform to the provisions of GB
9278.
5.3 Preparation of test template
5.3.1 Substrate and substrate treatment
The items of flexibility and impact resistance use tin plate; the remaining items use
steel plate. The tin plate and steel plate shall conform to the provisions of GB/T 9271;
substrate treatment. use 200# water sandpaper to dip into water and polish the tin
plate, so that to remove the tin layer; the steel plate used for throwing power,
breakdown voltage, coulomb efficiency, salt spray resistance, cycle corrosion
alternating test must be phosphating; the phosphating solution and other pre-treatment
reagents shall be agreed by both parties; cupping item shall not be phosphating; the
steel plate used for the remaining items without special provisions shall not be
phosphating; use 200# water sandpaper to dip into water to polish, and remove the
oxide layer. After the tin plate is polished or steel plate is phosphate, it shall be
electroplated as soon as possible, so that prevent the template rusted or phosphating
film damaged.
NOTE. the substrate material and treatment mode can be agreed. The arbitration test
phosphating plate is recommended to adopt BONDER plate (cold-rolled steel plate) with brand
of RB0 26S/NL60/0 or the standard phosphating plate agreed by both parties (during the test,
it shall be noted that generally the standard phosphating plate has positive side and negative
side).
5.3.2 Specimen preparation
Prepare as per the product provisions; prepare the plate after curing.
5.3.3 Requirements for preparing-plate
5.3.3.1 Equipment and material requirements
a) DC power supply. 0V~350V, the voltage ripple rate is less than 5%; the current
reading can be displayed.
b) Stainless steel plate. long strip shape, the area of each block (single-side) shall
be 1/5~1/3 of the coated template; the stainless-steel plate with brand of 316 is
recommended to be used.
c) Electrophoresis groove. volume is about 10L, material is plastic.
d) Adjustable speed electric mixer. mixing head is made of stainless steel or glass.
5.4.1.2 Fineness
It shall be performed as per the provisions of GB/T 1724. The double-component paint
only checks the color paste; while if the single-component paint is too viscous and
difficult to test, then diluent can be added according to the product provisions to adjust.
5.4.1.3 Storage stability
Place about 1L of sample (the double-component paint shall check each component)
into the appropriate plastic or glass container; 10% space shall be left in the container;
after sealing, place it into (50±2)°C constant temperature drying oven; take it out after
10d, place for 3h at (23±2)°C; check the “state in the container” according to the
method in 5.4.1.1, if stirring, it can be mixed evenly; prepare the plate as per 5.3; check
the coating film appearance (5.4.3.1); if the appearance is normal, then it is considered
“no abnormality”.
5.4.1.4 Solid content
It shall be performed as per GB/T 6751. The emulsion and color paste of double-
component paint shall be tested respectively.
5.4.2 Working fluid performance operation method
5.4.2.1 pH value
The accuracy of pH meter to determine the pH value shall be at least ±0.01. The total
amount of test solution is 100mL; adjust the temperature into the range of (25±1) °C,
then test as per the instrument requirement. Repeat for twice, take the average value.
The difference between the parallel determinations shall be no greater than 0.3;
otherwise repeat the determination.
5.4.2.2 Conductivity
The accuracy of conductivity meter to determine the conductivity shall be at least ±1%.
The total amount of test solution is 100mL; adjust the temperature into the range of
(25±1) °C, then test as per the instrument requirement. Repeat for twice, take the
average value. The difference between each measurement value and the average
value shall be no greater than 3%; otherwise repeat the determination.
5.4.2.3 Solid content
It shall be performed as per the provisions of GB/T 6751.
5.4.2.4 Ash content
5.4.2.4.1 Instrument and material
a) Analytical balance. sensitivity of 0.0001g.
tests.
5.4.2.9 Re-solubility
Electrophorese plate as per the requirements in 5.3.3; after washing with water,
immediately immerse 1/2 template into the working fluid; the stirring speed and working
fluid temperature shall be the same as the plate preparation; take out the template
after 10min; dry it as per the requirements in 5.3.3. The immersed coating film shall be
even and flat, free of pinhole, shrinkage, pits and other paint film defects; the part
contacting with the liquid surface is allowed to have slight line mark.
5.4.2.10 Breakdown voltage
5.4.2.10.1 Material
a) Phosphating steel plate.
b) 2000 mL beaker.
5.4.2.10.2 Operation procedures
This item shall be performed after the completion of other performances (after the
completion of this item, the working fluid may be damaged). Prepare the template,
working fluid and device, etc. as per the 5.3.2; electrophorese according to the product
specified voltage plus 50V (do not need gradual-voltage-rise process); if the current
value decreases as the electrophoresis time is increased, then improve 30V; repeat
such operation; when reaching such voltage, the current value shall increase rather
than decrease as the time goes on, immediately cut off the power supply; reduce the
above voltage by 20V; increase-decrease 10V according to the current decline or rise
as time goes on, until reaching the maximum voltage when the current does not rise
any more, which is called breakdown voltage.
NOTE. each electrophoresis shall be finished within 30s; if the coating film is found breakdown
during the test process (no evaluation shall be performed within 5cm on the upper part of
coating film), immediately cut off the power supply; if necessary, stir the working fluid for 20min,
then filter it.
5.4.2.11 Coulomb efficiency
5.4.2.11.1 Instrument and material
a) Coulometer.
b) Analytical balance. sensitivity of 0.0001g.
c) Electric hot blower oven. accuracy of ±2°C.
d) Phosphating steel plate.
Continuo...
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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