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Corrosion tests and standards

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CORROSION TESTING

Corrosion testings are accelerated test procedures that determine whether the resistance of corrosion protection coatings is provided and therefore the function of components in corrosive environments is assured.

Depending on industry and requirements, different test procedures are applied. For example, a distinction is made between constant (C) and varying (V) test methods according to superordinated standards (DIN, ISO) or those of the automobile manufacturers.

EXAMPLES OF TEST METHODS

Salt spray testing is the most commonly employed test for accelerated corrosion testing. Test samples are sprayed constantly with a 5% sodium chloride solution.
To ensure corrosion conditions are as realistic as possible, alternating climate tests are increasingly entering the market. Cyclical corrosion or alternating climate tests according to VDA 233-122 produce reproducible and practicerelated corrosion outcomes.

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Following completion of the test methods. The advance of corrosion on the tested material system is assessed visually or using electrophysical and microscopic procedures.

Not in order (n.i.o.)
Component fails due to visible base metal corrosion (“red rust”).
In order (i.o)
Component displays no coating corrosion (“white rust”) or base metal corrosion (“red rust”).

CURRENT STANDARDS AND TEST PROCEDURES