ISO 21207-2015 PDF

Full title and description

Corrosion tests in artificial atmospheres — Accelerated corrosion tests involving alternate exposure to corrosion‑promoting gases, neutral salt‑spray and drying. This International Standard (ISO 21207:2015, second edition) defines two accelerated cyclic corrosion test methods for assessing the corrosion resistance of products containing metals when exposed to chloride contamination (marine or de‑icing salts) together with corrosion‑promoting gases typical of industrial and traffic atmospheres.

Abstract

ISO 21207:2015 specifies apparatus, procedures and evaluation rules for two alternate‑exposure accelerated corrosion tests (methods A and B) that combine neutral salt‑spray, wet pollutant gas atmospheres (NO2, SO2 at high humidity) and drying steps. The methods are optimized for sensitive metallic products (for example electronic components) intended for use in coastal, road‑salt or polluted urban/industrial environments.

General information

• Status: Withdrawn (replaced by a 2025 edition).
• Publication date: December 2015 (Second edition, published 2015-12).
• Publisher: International Organization for Standardization (ISO).
• ICS / categories: 77.060 — Corrosion of metals.
• Edition / version: 2nd edition (ISO 21207:2015).
• Number of pages: 11 (publication document length as listed by ISO).

Scope

Defines two cyclic accelerated corrosion test methods to determine corrosion performance of products containing metals exposed to chloride salts (mainly NaCl from marine or de‑icing sources) combined with low concentrations of corrosion‑promoting gases (notably NO2 and SO2). The standard specifies test cycles, apparatus and environmental control, reference panels and evaluation procedures. Methods are intended especially for sensitive metallic products such as electronic and electrical components used in traffic, industrial and marine‑influenced environments.

Key topics and requirements

• Two defined test methods (Method A and Method B) with different cycle patterns to simulate moderate (traffic) and more severe (industrial/traffic) environments.
• Salt‑spray step performed as neutral salt spray per ISO 9227 (5 % NaCl solution, specified temperature and exposure durations).
• Wet gas exposure step using low concentrations of NO2 and SO2 at high relative humidity (≈95 %) and controlled temperature; gas generation and monitoring requirements described.
• Climatic cabinet and gas flow system requirements (uniform temperature and RH tolerances, airflow, monitoring) with references to ISO 10062 for cabinet criteria.
• Reference evaluation by copper reference panels and mass‑loss measurement procedures (useful for assessing test corrosivity and interlaboratory comparability).
• Guidance on specimen arrangement/holders, drying periods in standard laboratory climate (23 °C ±2 °C, RH 50 % ±5 %) and result interpretation rules.

Typical use and users

Used by corrosion testing laboratories, manufacturers of electronic/electrical components, automotive and transport OEMs, marine equipment producers, coatings companies and materials engineers for pre‑qualification, comparative screening and quality control of metals, coatings and assemblies expected to face combined chloride and gaseous pollution exposure. The standard supports product development and acceptance testing where road‑salt, coastal or industrial atmospheres are of concern.

Related standards

Commonly referenced standards and documents: ISO 9227 (neutral salt spray tests), ISO 10062 (climatic cabinet requirements for corrosion tests in low pollutant atmospheres), ISO 8407 (removal of corrosion products and mass‑loss measurement), ISO 10289 (rating of specimens after corrosion tests) and other accelerated atmospheric corrosion methods (e.g., ISO 16701).

Keywords

ISO 21207, accelerated corrosion test, neutral salt‑spray, NO2, SO2, cyclic exposure, corrosion testing, climatic cabinet, copper reference panels, salt spray testing.

FAQ

Q: What is this standard?

A: ISO 21207:2015 is an international standard that specifies two accelerated cyclic corrosion test methods combining neutral salt‑spray, pollutant gases and drying steps to evaluate corrosion resistance of products containing metals.

Q: What does it cover?

A: It covers test apparatus, reagents, defined test cycles (methods A and B), environmental control and monitoring, specimen arrangement, copper reference panels and evaluation procedures (mass‑loss and visual/rating approaches) for combined salt and gaseous corrosive exposure.

Q: Who typically uses it?

A: Corrosion test laboratories, electronics and electrical manufacturers, automotive/transport OEMs, coatings and materials engineers, and any organization needing to assess product durability in marine, road‑salt or polluted urban/industrial atmospheres.

Q: Is it current or superseded?

A: ISO 21207:2015 has been withdrawn and replaced by a later edition, ISO 21207:2025 (published April 2025). Users should reference the 2025 edition for the current requirements.

Q: Is it part of a series?

A: It is part of a family of ISO methods for corrosion testing in artificial atmospheres (examples include ISO 9227, ISO 16701 and other ISO/TC 156 publications) and is referenced alongside standards for apparatus and evaluation (e.g., ISO 10062, ISO 8407).

Q: What are the key keywords?

A: Accelerated corrosion, neutral salt spray, pollutant gases, NO2, SO2, cyclic exposure, copper reference panel, climatic cabinet, corrosion testing.