Overview
ISO 10062:2022 specifies controlled laboratory corrosion tests in artificial atmospheres containing one or more polluting gases at very low volume fractions (≤ 10−6). The standard defines apparatus, procedures and environmental conditions (temperature, relative humidity, gas type, concentration and flow) needed to assess the influence of trace gaseous pollutants on metals, alloys and a range of coatings (metallic, conversion, anodic oxide and organic). It is intended to produce reproducible, accelerated corrosion behaviour under no-condensation conditions and is not designed for direct material ranking or long‑term life prediction.
Key Topics and Requirements
- Scope and applicability: Tests apply to metals and their alloys, metallic coatings (anodic/cathodic), conversion and anodic oxide coatings, and organic coatings.
- Polluting gases: Typical gases covered include sulfur dioxide (SO2), hydrogen sulfide (H2S), chlorine (Cl2) and nitrogen dioxide (NO2). Concentrations in test methods are on the order of 10−7 to 10−6 volume fraction (e.g., SO2 ≈ 0.5×10−6 vol/vol in some methods).
- Test methods: Six representative methods (A–F) define gas type, concentrations, temperature and relative humidity options - e.g., (40 ± 1) °C & (80 ± 5) % RH or (25 ± 1) °C & (75 ± 3) % RH. Methods differ in aggressiveness and are not directly comparable.
- Apparatus and control: The chamber and gas-handling system must ensure uniform conditions (temperature control to ±1 °C, RH to ±3 %), homogeneous gas mixing, specified gas flow patterns and prevention of condensation. Annex A (normative) gives apparatus specifications; Annex B shows typical setups.
- Specimen handling: Preconditioning, examination, specimen placement (avoiding shielding or wall contact), maximum specimen surface area to prevent significant gas depletion, exposure time and test duration must be specified in the relevant test specification.
- Safety: Handling toxic/corrosive gases requires trained personnel, appropriate safety data sheets and safe equipment design. The standard includes warnings for SO2, H2S, Cl2 and NO2.
- Results and reporting: The document defines how to express results, required test reports and monitoring of test behaviour.
Applications and Users
- Materials and corrosion engineers evaluating susceptibility of metals and coatings to trace pollutants.
- Coating manufacturers verifying protective performance under polluted indoor or industrial atmospheres.
- Environmental simulation and test laboratories performing reproducible accelerated corrosion tests.
- OEMs and quality managers concerned with reliability of sensitive electrical/mechanical components in low-pollutant environments (storage/indoor use).
- Standards committees and researchers studying pollutant-driven corrosion mechanisms and synergistic gas effects.
Related Standards
- ISO 554 - Standard atmospheres for conditioning/testing
- ISO 558 - Conditioning and testing - Definitions
- ISO 7384 - Corrosion test specimen examination
Keywords: ISO 10062:2022, corrosion tests, artificial atmosphere, polluting gas, very low concentration, metals, coatings, SO2, H2S, Cl2, NO2, test chamber, temperature, relative humidity, corrosion testing.
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