Cr(III) Conversion Layers on Zinc and Zinc Alloys: Evolution and Perspectives
Trivalent chromium conversion layers have successfully replaced hexavalent conversion chromium on zinc and zinc alloys for many applications, especially in the automotive industry since the entry in force of the ELV directive.
- By altering the metallic structure of zinc/nickel by decreasing nodule formation, as shown in Fig. 8.
- By providing a passivate layer capable of retaining the lubricant.
- By acting on the top coat recipe as well. The hydrophobic lubricant must be better linked with the passivate layer and the surface energy of the passivate must be compatible with the top coat.
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