Overview
EN ISO 8407:2021/A1:2025 is a CEN-endorsed amendment to ISO 8407:2021, the international standard that specifies procedures for the removal of corrosion products from corrosion test specimens. This Amendment 1 (approved February 2025 and published March–May 2025) makes targeted changes to informative material (Table A.1) used by corrosion testing laboratories and materials engineers to ensure consistent, reproducible cleaning of test samples prior to analysis.
Key topics and technical changes
- The standard continues to address methods for cleaning and preparing corrosion test specimens so that measurements (for example mass loss or surface analysis) are accurate and comparable.
- Amendment 1 specific changes (ISO 8407:2021/Amd 1:2025):
- In Table A.1, the reagent name "sulfonic acid" is replaced with "sulfamic acid".
- A table layout change: a blank line between entries C.7.7 and C.7.8 is deleted so that C.7.8 and C.7.9 are included with the stainless steels entries.
- The document is produced under ISO/TC 156 (Corrosion of metals and alloys) in collaboration with CEN/TC 262, and is to be adopted as a national standard in CEN member countries by September 2025.
Applications and who uses it
- Laboratories performing corrosion testing, including mass-loss determinations, electrochemical tests, and surface analyses, use EN ISO 8407 to:
- Select appropriate chemical treatments and cleaning sequences for different metal and alloy test specimens.
- Ensure repeatability and comparability of corrosion test results.
- Prepare specimens for failure analysis, coating evaluation, and R&D.
- Typical users:
- Corrosion engineers and materials scientists
- Accredited testing and calibration labs
- Coatings and metal manufacturers
- Quality assurance and regulatory compliance teams
- Standards bodies and technical committees
Practical value
- Ensures consistent removal of corrosion products so that subsequent measurements reflect true material degradation rather than residual corrosion films or cleaning artefacts.
- The amendment improves clarity in reagent designation (important for procurement, safety data sheets, and method implementation) and corrects table organization for stainless steel entries, supporting accurate method selection.
Related references
Keywords: EN ISO 8407:2021/A1:2025, corrosion of metals, removal of corrosion products, corrosion test specimens, sulfamic acid, stainless steels, corrosion testing, ISO 8407 amendment.
