GB/T 7998-2023 in English
VALIDMethod for evaluating the susceptibility to intergranular corrosion of aluminum alloys
- Issued on:2023-05-23
- Implemented on:2023-12-01
- File Format:PDF
- Delivery:Via email within 5 business days
$330.00
《GB/T 7998-2023铝合金晶间腐蚀敏感性评价方法》由TC243（全国有色金属标准化技术委员会）归口，TC243SC1（全国有色金属标准化技术委员会轻金属分会）执行，主管部门为中国有色金属工业协会。
Introduction
1. Standard background and technological evolution
GB/T7998-2023 replaces the old versions of GB/T7998-2005 and GB/T26491-2011. The main updates include:
- Refinement of the test conditions
- Added warning clauses and etchant usage specifications
- Added sample sampling diagram and intergranular corrosion characteristic pictures
- Optimized the test parameters and operating procedures of the mass loss method and corrosion depth method.
2. Comparison of standard frameworks
| Standard version | Scope of application | Main updates |
|---|---|---|
| GB/T7998-2005 | $2×××$, $5×××$, $6×××$, $7×××$ series aluminum alloys | - Basic framework of corrosion test methods - Does not include detailed specimen preparation and placement requirements |
| GB/T26491-2011 | $5×××$ series aluminum alloys | - Special provisions for mass loss method - Lack of support for other alloy systems |
| GB/T7998-2023 | $2×××$, $5×××$, $6×××$, $7×××$ series aluminum alloys | - Unified and optimized the two test methods - Added the configuration and usage instructions of the etchant - Detailed provisions on the requirements for sample preparation and placement |
3. Implementation Suggestions
Suggestions for the implementation of GB/T7998-2023 in laboratories:
- Equipped with a conduction constant temperature device and an electronic balance that meet the accuracy requirements
- Prepare the etchant and test solution in strict accordance with the standard requirements
- Provide detailed training for test personnel, especially for operations involving hazardous reagents
- It is recommended to establish an intergranular corrosion feature library to assist in quick judgment
4. Explanation of professional terms and practical application cases
Keywords:Intergranular corrosion, mass loss method, corrosion depth method
Example: In the mass loss method test of a $5×××$ aluminum alloy, the mass loss per unit area is 18mg/cm². According to the standard requirements, it is necessary to further use a metallographic microscope to examine the longitudinal section to confirm whether intergranular corrosion characteristics appear.
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