GB/T 8753.4-2005 PDF English
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Anodizing of aluminium and aluminium alloys -- Assessment of quality of sealed anodic oxide coatings -- Part 4: Dye spot test with prior acid treatment
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GB/T 8753.4-2005: Anodizing of aluminium and aluminium alloys -- Assessment of quality of sealed anodic oxide coatings -- Part 4: Dye spot test with prior acid treatment
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GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.220.20
H 21
Replacing GB/T 8753-1988
Anodizing of aluminum and its alloys - Assessment of
quality of sealed anodic oxidation coatings - Part 4:
Dye spot test with prior acid treatment
(ISO 2143:1981, Anodizing of aluminum and its alloys - Estimation of loss of
absorptive power of anodic oxide coating after sealing - Dye spot test with prior acid
treatment, MOD)
ISSUED ON: JULY 04, 2005
IMPLEMENTED ON: DECEMBER 01, 2005
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine of PRC;
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
1 Scope ... 5
2 Principle of method ... 5
3 Solution ... 6
4 Specimen ... 6
5 Test procedure ... 6
6 Presentation of results ... 7
7 Test report ... 7
Appendix A (Informative) Comparison of clause numbers between this part and
ISO 2143:1981 ... 9
Foreword
GB/T 8753 "Anodizing of aluminum and its alloys - Assessment of quality of
sealed anodic oxidation coatings" is divided into 4 parts:
- GB/T 8753.1-2005 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);
- GB/T 8753.2-2005 Anodizing of aluminum and its alloys - Assessment of
quality of sealed anodic oxidation coatings - Part 2: Phosphoric
acid/chromic acid test with nitric acid predip;
- GB/T 8753.3-2005 Anodizing of aluminum and its alloys - Assessment of
quality of sealed anodic oxidation coatings - Part 3: Admittance method;
- GB/T 8753.4-2005 Anodizing of aluminum and its alloys - Assessment of
quality of sealed anodic oxidation coatings - Part 4: Dye spot test with prior
acid treatment.
This part is Part 4 of GB/T 8753.
This part modifies and adopts ISO 2143:1981 "Anodizing of aluminum and its
alloys - Estimation of loss of absorptive power of anodic oxide coatings after
sealing - Dye spot test with prior acid treatment" (English version). It is re-
drafted according to ISO 2143:1981. The difference between this part and ISO
2143:1981 is reflected in the compilation format. For the convenience of
comparison, a comparison of clause numbers BETWEEN this part AND the
corresponding international standard, is listed in the informative Appendix A.
This part replaces GB/T 8753-1988 "Anodizing of aluminum and aluminum
alloys - Estimation of loss of absorptive power of anodic oxide coatings after
sealing - Dye spot test with prior acid treatment". The difference between this
part and GB/T 8753-1988 is mainly reflected in the compilation format.
This part is suitable for the production control inspection of anodic oxidation,
which is a non-destructive testing method.
For the the methods specified in this part, although they can be graded based
on dye spots, the quantitative data is not accurate. It is not suitable to be an
arbitration test.
Appendix A of this part is an informative Appendix.
This part was proposed by the China Nonferrous Metals Industry Association.
Anodizing of aluminum and its alloys - Assessment of
quality of sealed anodic oxidation coatings - Part 4:
Dye spot test with prior acid treatment
1 Scope
This part specifies the method for assessing the quality of sealed anodic
oxidation coatings, by the anti-dying adsorption ability, after acid treatment.
This part is applicable to the production control inspection of anodic oxidation
coating, with anti-pollution ability, which is subject to atmospheric sun-exposure
or corrosive environment.
This part does not apply to the anodic oxidation coating, which is produced by
the following aluminum alloys:
a) Anodic oxidation coating, which has a copper content > 2% AND silicon
content > 4%;
b) Oxidation coating which is sealed by potassium dichromate;
c) Oxidation coating which is treated by oiling, waxing, painting;
d) Dark oxidation coating;
e) Oxidation coating, which has a thickness of less than 3 µm.
When the sealing solution contains nickel, cobalt or other organic additives, this
method is not effective enough.
2 Principle of method
In this method, the degreased surface of the specimen is first subject to acid
treatment; then it is colored by a dye, to observe the dyeing condition. According
to the loss of the dyeing adsorption capacity of the oxidation coating, assess
the anti-dyeing absorption capacity of the anodic oxidation coating.
The anti-dyeing adsorption capacity of the anodic oxidation coating is one of
the methods to assess the sealing quality. Under normal circumstances, the
strong anti-dyeing adsorption capacity indicates good sealing quality. However,
a slight decrease in the anti-dyeing adsorption capacity, does not mean that the
sealing quality of the oxidation coating is deteriorated, because the anti-dyeing
adsorption capacity is sometimes related to other factors.
3 Solution
The test solution shall be prepared by analytical reagents and distilled water (or
deionized water). The acid solutions, which are listed in 3.1 and 3.2, can be
equivalently applied to any kind of dye spot test. However, the solution which is
specified in 3.4 is safer. When using the container, which is made of anti-fluoric
acid material, to store the acid solution, it must be careful during operation.
3.1 Acid solution A: Pipette 25 mL of sulfuric acid (ρ20 1.84 g/mL). Weigh 10 g
of potassium fluoride into a 1000 mL volumetric flask. Slowly add water to dilute
it to the mark.
3.2 Acid solution B: Pipette 25 mL of fluorosilicic acid (H2SiF6) (ρ20 1.29 g/mL)
into a 1000 mL volumetric flask. Slowly add water, to dilute it to the mark.
3.3 Dyeing solution A: Pipette 5 g of Aluminum Blue 2LW solution (blue dye
which has an international color number 69), into a 1000 mL volumetric flask.
Use diluted sulfuric acid or diluted sodium hydroxide solution to adjust the pH
of the solution to 5.0 ± 0.5 (the temperature is about 23 °C).
3.4 Dyeing solution B: Pipette 10 g of Sanodal Red B3LW solution (acid red
which has an international color number 331), OR aluminum red GLW solution,
into a 1000 mL volumetric flask. Use diluted sulfuric acid or diluted sodium
hydroxide solution to adjust the pH of the solution to 5.0 ± 0.5 (the temperature
is about 23 °C).
4 Specimen
The specimen is generally cut directly from the product. If a specially prepared
specimen is used, even if its production process is the same as the product, it
will produce some erroneous results.
5 Test procedure
5.1 Use a cotton ball, which is dipped in acetone or ethanol, to wipe the surface
place it levelly.
5.2 Apply a drop of acid solution A or acid solution B (3.1 or 3.2), on the surface
of the specimen; keep it for exactly 1 minute (the temperature of the test solution
is about 23 °C).
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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