Overview - EN ISO 21207:2025 (Corrosion tests in artificial atmospheres)
EN ISO 21207:2025 specifies accelerated corrosion tests involving alternate exposure to corrosion‑promoting gases, neutral salt‑spray and drying. The standard is intended to assess the corrosion resistance of products containing copper where chloride ions (from marine spray or winter de‑icing salts) and industrial or traffic air pollution (corrosive gases) play a significant role. The document defines the test apparatus, reagents and detailed procedures for executing two test methods (A and B) and is especially suitable for sensitive metallic products such as electronic components used in traffic and industrial environments.
Key topics and technical requirements
- Scope and applicability: Focus on copper‑containing products and environments influenced by chloride ions and corrosion‑promoting gases.
- Apparatus and reagents: Requirements for chambers and media, including exposure to corrosive gas mixtures and neutral salt‑spray in accordance with ISO 9227.
- Gas exposure: Controlled exposure to corrosion‑promoting gases (e.g., NO and SO oxides) followed by drying phases.
- Test cycles: Two defined accelerated test methods (Test method A and Test method B) that alternate salt‑spray, gas exposure and drying steps.
- Validation and calibration: Use of reference test panels, arrangement protocols, and mass‑loss determination to validate test corrosivity and ensure repeatability.
- Evaluation and reporting: Criteria for assessing corrosion performance, recommended test durations (annex), and required content for conformity test reports.
- Interlaboratory results: Annex B includes interlaboratory comparison data to inform dispersion and acceptance limits.
- Corrosion testing laboratories conducting accelerated atmosphere testing for qualification and comparison.
- Manufacturers of electronic components and assemblies containing copper that are used in coastal, road‑salt or polluted urban environments.
- Automotive, rail and transport suppliers evaluating component durability against de‑icing salts and traffic pollution.
- Coatings and surface‑treatment suppliers validating protective systems under combined chloride and gaseous corrosion stress.
- Design and QA engineers specifying environmental qualification tests for product reliability.
Related standards
- ISO 9227 - Neutral salt spray (NSS) testing (referenced directly for salt‑spray requirements).
- EN ISO 21207:2025 supersedes the previous edition (EN ISO 21207:2022) and is published under CEN endorsement.
EN ISO 21207:2025 is a practical standard for reproducing combined chloride‑and‑gas corrosion stress in the lab, enabling consistent, validated assessment of copper‑containing products for use in marine, winter‑road and industrial/traffic atmospheres.
