EN ISO 9227:2022 PDF

Overview

EN ISO 9227:2022 - Corrosion tests in artificial atmospheres: Salt spray tests specifies standardized methods for performing neutral salt spray (NSS), acetic acid salt spray (AASS) and copper‑accelerated acetic acid salt spray (CASS) tests. Published by CEN and aligned with ISO 9227:2022, the standard defines the required apparatus, reagents and procedures used to assess corrosion resistance of metallic materials with or without temporary or permanent corrosion protection. It also describes how to evaluate the corrosivity of the salt spray cabinet environment using reference specimens.

EN ISO 9227:2022 is intended for quality control and detection of coating discontinuities (pores, defects). It does not prescribe specimen dimensions, exposure periods or result interpretation for specific products - those are provided in product specifications.

Key topics and technical requirements

• Test methods covered: Neutral Salt Spray (NSS), Acetic Acid Salt Spray (AASS), Copper‑Accelerated Acetic Acid Salt Spray (CASS).
• Test solutions: Preparation and pH adjustment of sodium chloride solutions; specific procedures for NSS, AASS and CASS, including filtration and use of diluted acetic acid.
• Apparatus requirements: Design and operation of spray cabinets, heaters/temperature control, spraying devices, collecting devices and component protection.
• Cabinet evaluation: Procedures and reference specimens to determine cabinet corrosivity and ensure reproducible test conditions.
• Specimen arrangement and handling: Guidance on arranging test and reference specimens, post‑test treatment for metallic/inorganic and organic coatings, and scribed vs. unscribed specimens.
• Test controls and reporting: Operating conditions, test duration, result evaluation and required test report content.
• Limitations: The standard explicitly states salt spray tests are not suitable for ranking different substrate types or predicting long‑term field corrosion performance.

Practical applications

• Quality control of metallic substrates, metallic coatings (anodic/cathodic), conversion and anodic oxide coatings, and organic coatings on metals.
• Rapid screening for coating defects (pores, pinholes) and production consistency checks.
• Specific use cases: testing decorative Cu/Ni/Cr or Ni/Cr coatings and anodized or organic coatings on aluminium (AASS/CASS particularly relevant).
• Useful in R&D for comparative testing of the same substrate/coating system under controlled accelerated conditions.

Who should use this standard

• Corrosion testing laboratories and test engineers
• Coating and plating manufacturers
• Quality assurance and inspection teams
• Product standards writers and regulatory bodies
• R&D teams developing corrosion protection systems

Related standards

• Product‑specific standards and specifications that define specimen dimensions, exposure periods and interpretation criteria.
• Other ISO/CEN corrosion standards published by ISO/TC 156 and CEN/TC 262 (refer to national standards bodies for applicable references).

Keywords: EN ISO 9227:2022, salt spray tests, NSS, AASS, CASS, corrosion testing, salt spray chamber, corrosion resistance, metallic coatings, corrosion protection.