Corrosion tests in artificial atmospheres — Salt spray tests AMENDMENT 1: Footnote of Warning
1Key Takeaways
This document specifies the salt spray test for assessing the corrosion resistance of metal and coated specimens.
2Expert Interpretation
In-depth analysis of the updated requirements for CAS trademark declaration in the first amendment to ISO 9227:2022, including the technical background of the salt spray test standard, comparison of the revised content, and laboratory implementation suggestions. Professional interpretation of the latest developments in international corrosion testing standards.
Standard Amendment Background and Technology Evolution
The ISO 9227:2022/Amd.1:2024 amendment, released in June 2024, made normative revisions to the footnote declaration of the CAS Registry Number® trademark in the fifth edition of the salt spray test standard. This amendment reflects the ISO standard's rigorous requirements for intellectual property declarations while maintaining the scientific equivalence of the test methods.
Detailed comparison of revised contents
| Comparison dimensions | Original standard (2022) | Amendment (2024) |
|---|---|---|
| Trademark ownership statement | Trademark ownership is not clearly stated | Explicitly stated as a trademark of the American Chemical Society (ACS) |
| Equivalency clause | Alternative products are not explicitly allowed | New conditions for the use of equivalent products |
| Disclaimer | General disclaimer of standard text | Specially emphasizes that it does not constitute ISO endorsement |
Key Terms Explanation and Application Cases
CAS Registry Number®: A unique identification system for chemical substances developed by the Chemical Abstracts Service (CAS) of the United States, used to accurately identify the composition of the test solution in corrosion testing. For example, when preparing a 5% NaCl solution, sodium chloride marked with CAS 7647-14-5 must be used.
Equivalent Product Terms: If a laboratory uses chemical reagents that are not certified by ACS, it must prove that their purity is consistent with that of the standard substance through ICP-MS component analysis, and retain at least 3 batches of comparison data.
Laboratory Implementation Recommendations
- Update the reagent procurement terms in the standard operating procedure (SOP) to indicate the declaration requirements of the ACS trademark
- Establish an alternative chemical verification process, including:
- Supplier qualification review
- Batch test report retention
- Parallel comparison test
- Add a standard version statement on the front page of the test report: "Implemented in accordance with ISO 9227:2022/Amd.1:2024"
Relevance to the standard system
This amendment is coordinated with mainstream salt spray test standards such as ASTM B117-19 and JIS Z 2371, but is more stringent in terms of intellectual property declarations. Special attention should be paid to the following during implementation:
- Compatibility with ISO 9223 corrosivity classification standard
- Connection with ISO 8407 corrosion product removal method