Delmet stainless steel excellence since 1949

METAL PASSIVATION

The passivation of stainless steel is a process that happens spontaneously in nature, but it can be accelerated and perfected, following pickling, to allow the formation of an anticorrosive and contamination-free protective layer with the aid of specific chemical compounds.

PASSIVATION

After pickling, the steel is able to autonomously restore the protective chromium oxide film, but this self-passivation process takes a long time and requires particular conditions. Passivation is a process that induces the formation of this protective layer by means of solutions that are more oxidizing than atmospheric oxygen, such as nitric or citric acid or thanks to the action of an external anodic current as in the case of electropolishing (ASTM B912)

These two types of passivation are termed spontaneous and induced.

Pickling and passivation treatments can be performed in accordance with ASTM A480 and ASTM 967 standards by immersion or spray using gels or liquids, with products completely free of or containing nitric acid, according to the customer's specifications.

After treatment, it is possible to check the effectiveness of the treatment using our passivation test, which also allows you to detect any contamination.

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