Chromium-free or low-chromium metal surface passivation

Details Chromium-free or low-chromium metal surface passivation Chromium-free or low-chromium metal surface passivation

C - Chemistry, Metallurgy

23

C

148/16

C23C 22/46 (2006.01) C23C 22/34 (2006.01) C23C 22/40 (2006.01)

Patent

CA 1137393

Case 780923 CHROMIUM-FREE OR LOW-CHROMIUM METAL SURFACE PASSIVATION Abstract of the Disclosure Substrates, especially those having plated metal surfaces, are subjected to passivation treatments in baths that incorporate one or more film-forming agents at least one of which does not require chromium and includes anions or cations of elements other than chromium. Typically, the anions or cations are introduced as bath-soluble salts which react with the plated surface of the substrate to form an adherent, coherent passivation surface film. Also present within these baths are a source of hydrogen ions and a bath- soluble carboxylic acid or derivative activator for enhancing the rate of the passivation reaction. Articles passivated in baths incorporating these film-forming agents have a hydro- phobic surface that exhibits corrosion resistance and that typically has a bright finish.

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