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GB/T 10119-2008Determination of dezincification corrosion resistance of brass (English PDF)

黄铜耐脱锌腐蚀性能的测定

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Issued by

SAMR; SAC

Level / Type

National · Recommended

Issue date

March 31, 2008

Implementation date

September 1, 2008

Scope

GB/T 10119-2008 is the English-translated version of 黄铜耐脱锌腐蚀性能的测定.

GB/T 10119-2008 is the Chinese standard "Determination of dezincification corrosion resistance of brass". Its scope clause reads: This standard specifies the method for determining the dezincification corrosion resistance of brass materials.

This standard applies to the determination of dezincification corrosion resistance of brass materials. Its clauses include principle of methods; reagents and materials; test instrument and equipment; specimen preparation and requirements; test conditions and procedures; microscopic observation and measurement; test report.

It was issued by the General Administration of Quality Supervision, Inspection and Quarantine on MARCH 31, 2008 and took effect on SEPTEMBER 01, 2008.

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Document preview — GB/T 10119-2008

National Standard of the People's Republic of China

ICS: 77.120.99

Foreword3
1 Scope5
2 Principle of methods5
3 Reagents and materials5
4 Test instrument and equipment5
5 Specimen preparation and requirements6
6 Test conditions and procedures6
7 Microscopic observation and measurement8
8 Test report9
Appendix A (Informative) Comparison of clause numbers between this standard and ISO 6509:198111
Appendix B (Informative) Technical differences between this standard and ISO 6509:1981, as well as their reasons12

1 Scope

This standard specifies the method for determining the dezincification corrosion resistance of brass materials.

This standard applies to the determination of dezincification corrosion resistance of brass materials.

2 Principle of methods

Because different brass materials have different dezincification corrosion rates, the use of copper chloride solution can accelerate the dezincification corrosion of brass, thereby producing different depths of dezincification layers, the depth of which is measured by a metallurgical microscope.

3 Reagents and materials

3.1 Copper chloride solution (10 g/L): Dissolve 12.7 g of copper chloride (CuCl2 . 2H2O) in distilled water or deionized water. Dilute it to 1000 mL (prepare it before use).

3.2 Epoxy resin or other non-conducting materials, which have similar properties.

3.3 Anhydrous ethanol.

4 Test instrument and equipment

4.1 Test device: Constant temperature water bath or oil bath.

4.2 Metallurgical microscope (with micrometer eyepiece).

4.3 Glass beaker (1000 mL).

4.4 Hair dryer.

4.5 Polishing machine.

4.6 Dryer.

5 Specimen preparation and requirements

5.1 Sampling

5.1.1 Forgings and castings specimens shall be taken at the thinnest and thickest part of the cross-section, respectively. The specimens of extruded, drawn or rolled products shall be taken, parallel and perpendicular to the processing direction.

5.1.2 Take at least 3 parallel specimens each time.

5.1.3 The size of the specimen shall be as close as possible to 10 mm x 10 mm x 10 mm. The exposed area of the specimen shall be about 100 mm2. If this requirement is not met, it shall take the largest area.

5.1.4 When sampling, it shall keep the original state of the specimen, to avoid deformation of the specimen, due to clamping or sawing, OR other changes that affect the test results.

5.2 Preparation of specimen

5.2.1 It is embedded by epoxy resin or other non-conducting materials (3.2).

5.2.2 The exposed surface of the specimen is ground by metallographic sandpaper; finally polished by No.500 water sandpaper.

5.2.3 Use water to wash the ground specimen. Use absolute ethanol to wipe it. Use hair dryer (4.4) to blow it dry. If the corrosion test cannot be performed in time, it shall be stored in a desiccator (4.6).

6 Test conditions and procedures

6.1 Test conditions

6.1.1 Temperature of test solution: 75 °C ± 2 °C

6.1.2 Volume of test solution: mL of copper chloride solution (3.1) is required, for every 100 mm2 of the actual exposed area of the specimen.

6.1.3 Test time: 24 h continuously

6.1.4 Only parallel specimens of the same alloy material can be placed in each test beaker (4.3). […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 12 pages — is available in the English PDF.

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