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ISO 9227

The ISO 9227 or 9227:2017 standard is a guideline that describes how to perform the salt spray test, also known as the salt spray test.

The salt spray test is the most commonly used corrosion test for metals with or without an organic or inorganic coating.

Through continuous spraying with sodium chloride solution in a climatic chamber, corrosion formation is accelerated and the corrosion resistance of a material can be checked.

Note: Standard ISO 9227 says nothing about a direct relationship between salt spray test results and the expected service life of a material in practice.

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Three variants of ISO 9227

The current ISO 9227 standard has three variants in terms of implementation:

ISO 9227-NSS: The neutral salt spray test.
This variant is applied to almost all metals, with or without a coating. A 5% sodium chloride solution, a temperature of 35°C and a pH of 6.5 to 7.2 are used.

ISO 9227-ASS: The acetic acid salt spray test.
Is widely used for testing decorative coatings from copper-nickel-chrome or nickel-chrome. It is also widely used for organic coatings on aluminum (as also prescribed in Qualicoat). The difference with ISO 9227-NSS is that in the ASS test the salt solution is acidified to pH 3.1-3.3 by the addition of glacial acetic acid.

ISO 9227-CASS: The copper-acetic acid salt spray test.
The CASS variant, like the ASS variant, is widely used for testing decorative coatings from copper-nickel-chrome or nickel-chrome and sometimes on coated or anodized aluminum. The design is similar to that of the ASS, however with an additional addition of 0.26 grams /liter of CuCl2*2H2O and a temperature of 50°C.

Differences from other standards

Other standards that describe the neutral salt spray test are ASTM B117 and DIN 50021. These are virtually identical in design to ISO 9227. The difference between ISO 9227 and ASTM B117 is that in ISO 9227 and DIN 50021 the samples are placed at an angle of 15 to 25° instead of the 15 to 30° in ASTM B117.

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