Overview
ISO 21207:2025 - Corrosion tests in artificial atmospheres specifies two accelerated corrosion test methods based on alternate exposure to corrosion‑promoting gases, neutral salt‑spray and drying. The standard focuses on assessing the corrosion resistance of products containing copper in environments where chloride ions (mainly sodium chloride from marine spray or winter de‑icing salts) and pollution gases from industrial or traffic sources are significant. It defines test apparatus, procedures, validation and reporting requirements and is particularly suited to sensitive metal products (e.g., electronic components) used in traffic and industrial environments.
Key topics and technical requirements
- Test methods A and B: two alternate exposure cycles designed to simulate moderately aggressive (A) and more severe (B) traffic/industrial environments.
- Cycle components: alternating exposure to corrosion‑promoting gases, neutral salt‑spray (per ISO 9227), and controlled drying phases.
- Apparatus and reagents: specifications for gas exposure chambers, salt‑spray equipment and standard atmosphere drying conditions.
- Validation and control: use of reference test panels, arrangement protocols, mass‑loss determination for copper, and defined acceptance/dispersion limits.
- Test objects and procedure: guidance on specimen preparation, mounting, exposure sequencing and test durations (recommended periods included in Annex A).
- Evaluation and reporting: criteria for assessing corrosion damage, measurement methods and required test report elements.
- Interlaboratory data: Annex B provides comparative results from an interlaboratory exercise; bibliographic references updated for the 2025 third edition.
- Note: the standard is intended for evaluating whole‑product corrosion resistance under accelerated conditions and is not a direct substitute for long‑term field performance prediction or material ranking.
Applications
ISO 21207:2025 is applicable to:
- Manufacturers and suppliers of copper‑containing components and assemblies (electronic modules, connectors, plated parts).
- Environmental and corrosion testing laboratories performing accelerated corrosion qualification.
- Automotive, marine and transportation industries, and infrastructure sectors evaluating equipment exposed to salt contamination and polluted air.
- Coating and plating developers, quality managers and R&D teams validating protective treatments against chloride‑ and gas‑induced corrosion.
Practical benefits include faster qualification of products for service in coastal or winter‑salted environments, reproducible test cycles for development and quality assurance, and harmonized reporting for procurement and certification.
Related standards
- ISO 9227 - Neutral salt spray testing (referenced for salt‑spray stages).
- Standards and guidance from ISO/TC 156 (Corrosion of metals and alloys) and relevant IEC/CEN joint work for electro‑technical components.
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