ASTM G67
Standard Test Method for Determining the Susceptibility to Intergranular Corrosion of 5XXX Series Aluminum Alloys by Mass Loss After Exposure to Nitric Acid (NAMLT Test)
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Language: English
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About This Item
ASTM G67 is the ASTM standard for determining the susceptibility of 5XXX series aluminum alloys to intergranular corrosion by mass loss after exposure to nitric acid. It is commonly used to help assess how these alloys perform when corrosion resistance is a concern. By providing a defined NAMLT test approach, the standard supports more consistent evaluation, clearer product acceptance decisions, and better alignment between material performance claims and test results.
ASTM G67 standard overview
The ASTM G67 standard describes a test method focused on 5XXX series aluminum alloys and their tendency toward intergranular corrosion as measured through mass loss after nitric acid exposure. Its technical context is specific: it is not a general corrosion guide, but a targeted method for comparing material response under a defined chemical exposure. This makes it useful for standardized testing, material qualification, and documentation where repeatable evaluation of corrosion susceptibility is needed.
Where is ASTM G67 used?
ASTM G67 is commonly used in laboratories, quality control programs, and materials evaluation workflows involving 5XXX series aluminum alloys. It is relevant wherever these alloys are selected for applications that depend on corrosion resistance and consistent material behavior. The method is typically used by testing organizations, manufacturers, and purchasers who need a standard way to verify performance using the NAMLT test and compare results across lots, suppliers, or production runs.
Practical importance of ASTM G67
ASTM G67 matters because it gives organizations a recognized way to check susceptibility to intergranular corrosion using a mass-loss based test. That helps improve consistency in procurement, acceptance testing, and internal quality control. For users of 5XXX series aluminum alloys, the standard can support more reliable product evaluation and reduce uncertainty when comparing materials. It also helps teams document compliance with a clear, repeatable technical method rather than relying on informal or inconsistent testing practices.
- 5XXX series aluminum alloy testing
- Nitric acid exposure and mass loss measurement
- Intergranular corrosion susceptibility assessment
- Quality control and material qualification
- Standardized NAMLT test documentation
- Publication Date: 2024-11-08
- Publisher: ASTM
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