GB/T 8753.1-2017 PDF English
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| Standard ID | Contents [version] | USD | STEP2 | [PDF] delivery | Name of Chinese Standard | Status |
| GB/T 8753.1-2017 | English | 110 |
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Anodizing of aluminum and its alloys - Assessment of quality of sealed anodic oxidation coatings - Part 1: Measurement of the loss of mass after immersion in acid solution(s)
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| GB/T 8753.1-2005 | English | 239 |
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Anodizing of aluminium and aluminium alloys -- Assessment of quality of sealed anodic oxide coatings -- Part 1: Phosphoric acid/chromic acid test
| Obsolete |
| GB/T 8753-1988 | English | 199 |
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Anodizing of aluminium and aluminium alloys--Estimationof loss of absorptive power of anodic oxide coatings after sealing--Dye spot test with prior acid treatment
| Obsolete |
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GB/T 8753.1-2017: Anodizing of aluminum and its alloys - Assessment of quality of sealed anodic oxidation coatings - Part 1: Measurement of the loss of mass after immersion in acid solution(s)
---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/GBT8753.1-2017
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.220.20
H 21
Replacing GB/T 8753.1-2005, GB/T 8753.2-2005
Anodizing of aluminum and its alloys - Assessment of
quality of sealed anodic oxidation coatings - Part 1.
Measurement of the loss of mass after immersion in
acid solution(s)
Issued on. MAY 31, 2017
Implemented on. DECEMBER 01, 2017
Issued by. General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword... 3
1 Scope... 6
2 Normative references... 6
3 Overview of method... 7
4 Reagents... 7
5 Instruments... 8
6 Specimens... 8
7 Test procedure... 9
8 Test report... 12
Foreword
GB/T 8753 "Anodizing of aluminum and its alloys - Assessment of quality of
sealed anodic oxidation coatings" is divided into 3 parts.
- Part 1.Measurement of the loss of mass after immersion in acid solution(s);
- Part 3.Admittance test;
- Part 4.Dye spot test with prior acid treatment.
This part is Part 1 of GB/T 8753.
This part was drafted in accordance with the rules given in GB/T 1.1-2009.
This part replaces GB/T 8753.1-2005 " Anodizing of aluminum and aluminum
alloys - Assessment of quality of sealed anodic oxide coatings - Part 1.
Phosphoric acid/chromic acid test without nitric acid predip" and GB/T 8753.2-
2005 " Anodizing of aluminum and aluminum alloys - Assessment of quality of
sealed anodic oxide coatings - Part 2.Phosphoric acid/chromic acid test with
nitric acid predip". This part is based on GB/T 8753.1-2005 and integrates part
of the content of GB/T 8753.2-2005.Compared with GB/T 8753.1-2005, except
for editorial changes, the main technical changes are as follows.
- MODIFY the scope of the assessment method of this part (see Chapter 1;
Chapter 1 of the 2005 edition);
- MODIFY the scope of application of the assessment method (see Chapter
1; Chapter 1 of the 2005 edition);
- ADD the arbitration test method (see Chapter 1);
- DELETE the description that "this method is a destructive test" (see Chapter
1 of the 2005 edition);
- ADD the normative references (see Chapter 2);
- MODIFY the principle of the method to the overview of the method (see
Chapter 3; Chapter 2 of the 2005 edition);
- MODIFY the reagent representation and preparation method (see Chapter
4; Chapter 3 of the 2005 edition);
- ADD the requirements of constant temperature water bath (see 5.2);
- ADD the requirements for vernier calipers (see 5.3);
- MODIFY the requirements of the specimen (see Chapter 6; Chapter 5 of
the 2005 edition);
- MODIFY the measurement of the anodic oxidation area of the specimen
(see 7.1; 6.1 of the 2005 edition);
- MODIFY the presentation of results (see 7.5.3; Chapter 7 of the 2005
edition);
- ADD a reminder that hexavalent chromium is toxic (see 7.5.4);
- ADD the reminder and emission requirements of hexavalent chromium
pollution to environment (see 7.5.5);
- ADD the phosphoric acid method without nitric acid predip (see 7.7);
- ADD the phosphoric acid method with nitric acid predip (see 7.8);
- ADD the phosphoric acid / sodium molybdate method with nitric acid predip
(see 7.9);
- ADD the requirement for the total mass of dissolved materials in the test
solution (see 7.10.2);
- MODIFY the information required in the test report (see Chapter 8; Chapter
8 of the 2005 edition);
- DELETE the Appendix A (see Appendix A of the 2005 edition).
This part was proposed by the China Nonferrous Metals Industry Association.
This part shall be under the jurisdiction of the National Non-ferrous Metals
Standardization Technical Committee (SAC/TC 243).
Drafting organizations of this part. National Nonferrous Metals Quality
Supervision and Inspection Center, Guangdong Xingfa Aluminum Co., Ltd.,
Guangdong Jianmei Aluminum Profile Factory (Group) Co., Ltd., Sichuan
Sanxing New Material Technology Co., Ltd., Guangdong Fenglv Aluminum Co.,
Ltd., Fujian Minfa Aluminum Co., Ltd., Fujian Nanping Aluminum Co., Ltd.,
Guangdong Industrial Analysis and Testing Center, Guangdong Xinhe
Aluminum Xinxing Co., Ltd., Guangdong Haomei Aluminum Co., Ltd.,
Shandong Nanshan Aluminum Co., Ltd., Guangdong Huachang Aluminum
Factory Co., Ltd.
The main drafters of this part. Fan Zhigang, Xia Xiuqun, Dai Yuexing, Wang
Zheng, Yang Hui, Zhu Yaohui, Liu Quanquan, Li Yang, Guo Shijin, Lian Zixiong,
Yang Jingjun, Zang Wei, Tang Xingyu.
This part replaces GB/T 8753.1-2005 and GB/T 8753.2-2005.
The previous releases of GB/T 8753.1-2005 are as follows.
- GB/T 14952.1-1994.
The previous releases of GB/T 8753.2-2005 are as follows.
- GB/T 14952.2-1994.
Anodizing of aluminum and its alloys - Assessment of
quality of sealed anodic oxidation coatings - Part 1.
Measurement of the loss of mass after immersion in
acid solution(s)
1 Scope
This part of GB/T 8753 specifies a method, for assessing the quality of sealed
anodic oxidation coatings of aluminum and aluminum alloy, through the loss of
mass, after they are etched in an acid solution.
This part applies to the assessment of the quality of the sealed anodic oxidation
coating, which is exposed to the atmosphere, for the purpose of decoration and
protection, has the ability to resist pollution, can resist environmental corrosion.
Among them, the acid etching method without nitric acid predip is suitable for
the assessment of the quality of the sealed anodic oxidation coatings for indoor
use; the acid etching method with nitric acid predip is suitable for the
assessment of the quality of the sealed anodic oxidation coatings for outdoor
use. When the test result is disputed, the phosphoric acid/chromic acid test with
nitric acid predip can be used as an arbitration test.
This part does not apply to the anodic oxidation coating, which is treated by the
following processes.
a) Hard anodic oxidation coating that is usually not sealed;
b) Anodic oxidation coating that has been sealed in a dichromate solution;
c) Anodic oxidation coating that is formed in chromic acid solution;
d) Anodic oxidation coating after hydrophobic treatment.
2 Normative references
The following documents are essential to the application of this document. For
the dated documents, only the versions with the dates indicated are applicable
to this document; for the undated documents, only the latest version (including
all the amendments) are applicable to this standard.
GB/T 6682 Water for analytical laboratory use - Specification and test
methods
GB/T 8170 Rules of rounding off for numerical values & expression and
judgement of limiting values
GB 8978 Integrated waste water discharge standard
3 Overview of method
3.1 Phosphoric chromic acid method. The specimen is pre-dipped in nitric acid
(or not), etched in a phosphoric chromic acid solution. The mass loss of the
specimen is measured, to assess the quality of the sealed anodic oxidation
coating. Phosphoric chromic acid solution dissolves the anodic oxidation
coating, prevents the corrosion of the non-anodic oxidation surface through
passivation. The nitric acid predip will increase the mass loss of poorly sealed
specimens. The phosphoric chromic acid method is a classic and stable test
method.
3.2 Phosphoric acid method. The specimen is (or is not) pre-dipped in nitric acid,
etched in a phosphoric acid solution. The mass loss of the specimen is
measured, to assess the quality of the sealed anodic oxidation coating.
3.3 Sodium molybdate phosphate method. The specimen is pre-dipped in nitric
acid, etched in a sodium molybdate phosphate solution. The mass loss of the
specimen is measured, to assess the quality of sealed anodic oxidation coating.
4 Reagents
4.1 Unless otherwise stated, the reagents used in this part are all analytical
reagents, that comply with national standards or industry standards. The water
used is distilled water or deionized water of grade 3 or higher, which is specified
in GB/T 6682.
4.2 Nitric acid [ρ20 = 1.40 g/mL, HNO3 content (mass fraction). 65.0% ~ 68.0%].
4.3 Phosphoric acid [ρ20 =1.7 g/mL, H3PO4 content (mass fraction). not less
than 85.0%].
4.4 Chromium trioxide (CrO3).
4.7 Phosphoric chromic acid solution. Dissolve 20 g of chromium trioxide (4.4)
and 35 mL of phosphoric acid (4.3), in 500 mL of water. Transfer to a 1000 mL
volumetric flask. Use water to dilute to the mark. Mix it uniformly.
4.8 Phosphoric acid solution. Dissolve 35 mL of phosphoric acid (4.3) in 500
mL of water. Transfer to a 1000 mL volumetric flask. Use water to dilute to the
mark. Mix it uniformly.
4.9 Sodium molybdate phosphate solution. Dissolve 1 g of sodium molybdate
(4.5) and 35 mL of phosphoric acid (4.3), in 500 mL of water.
5 Instruments
5.1 Analytical balance, which has a sensitivity of 0.1 mg.
5.2 Constant temperature water bath, which has a temperature fluctuation of
not more than ±1 °C.
6 Specimens
6.1 For hot-sealed materials, they can be sampled at any time after sealing. For
medium-temperature and cold-sealed materials, they shall be placed for more
than 24 hours before sampling.
6.2 Cut a specimen from the material to be tested. Its anodic oxidation area is
about 1 dm2 (minimum 0.5 dm2). The mass of the specimen usually does not
exceed 200 g.
6.4 After cutting the specimen, it shall remove the burrs from the cutting edge
of the specimen.
7 Test procedure
7.1 Measurement of the anodic oxidation area of specimen
Use a vernier caliper (5.3) to measure the size of the specimen. Calculate the
anodic oxidation area A of the specimen (which retains 2 decimal places).
7.2 Degreasing
At room temperature, stir the specimen in a suitable organic solvent (such as
acetone or ethanol) for 30 s; OR wipe off the grease. When using chlorinated
solvents, such as perchloroethylene, for degreasing, the pre-drying shall be
carried out in a well-ventilated fume hood, to prevent inhalation of solvent
vapors.
7.4 Weighing
Weigh the specimen mass (m1) immediately, accurate to 0.1 mg.
7.5 Phosphoric chromic acid method without nitric acid predip
7.5.1 Place the specimen upright; completely immerse it in the pre-heated
phosphoric chromic acid solution (4.7), to soak for 15 min. The test temperature
is (38 ± 1) °C.
7.5.4 Hexavalent chromium is toxic, so it shall pay attention to skin protection
during operation.
7.5.5 Hexavalent chromium pollutes the environment. After the test, the
hexavalent chromium solution shall be collected uniformly. It is discharged
according to the requirements of GB 8978, after treatment.
7.5.6 Phosphoric chromic acid solution does not etch the non-anodized surface
of the specimen.
7.6 Phosphoric chromic acid method with nitric acid predip
7.6.1 Put the specimen upright; completely immerse it in the predip solution (4.6)
at a temperature of (19 ± 1) °C. Keep it for 10 min. Then take the specimen out
of the predip solution. First use tap water AND then deionized water or distilled
water, to wash it thoroughly clean.
7.7 Phosphoric acid method without nitric acid predip
7.7.1 Put the specimen upright; completely immerse it in the pre-heated
phosphoric acid solution (4.8). Soak it for 13 min. The test temperature is (38 ±
1) °C.
7.7.2 Remove the specimen from the test solution. First use tap water, then
deionized water or distilled water to wash it. After drying according to 7.3,
immediately weigh the mass of the specimen (m2), accurate to 0.1 mg.
7.7.3 Result calculation. Calculate in accordance with the provisions of 7.5.3.
7.7.4 Phosphoric acid solution will etch the non-anodized surface of the
specimen. When the mass loss, during the test of non-anodized surface, does
not exceed 10 mg/dm2, meanwhile the non-anodized surface does not exceed
20% of the total area of specimen, the non-anodized area may not be
considered. If the above conditions are not met, the non-anodized surface of
the specimen shall be shielded. The mass loss of the shielding material, during
operation, shall not exceed 1.0 mg/dm2.For the mass loss of the non-anodized
surface, it can be determined using the alloy specimen, which is same as the
specimen.
7.8 Phosphoric acid method with nitric acid predip
7.8.1 Put the specimen upright; completely immerse it in the predip solution
(4.6), at a temperature of (19 ± 1) °C. Keep it for 10 min. Then take the specimen
out of the predip solution. First use tap water, then deionized water or distilled
water, to wash it thoroughly clean.
8 Test report
The test report shall include the following.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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