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EN-GJS-700-2 | 5.3300 Black chromate coating

Numeric designation5.3300
Chemical designationEN-GJS-700-2
StateBlack chromate coating
Etching3 % Nital

Chromium coatings on metals are formed by treatment with chromic acid and are applied as corrosion protection. The color depends on the thickness (here approx. 1 µm).