Passivation composition and process for zinciferous and aluminif

Details Passivation composition and process for zinciferous and aluminif Passivation composition and process for zinciferous and aluminif

1996-01-23

1997-11-04

Lusignan, Michael

Stock material or miscellaneous articles

Composite

Of metal

106 1412, 106 1421, 148251, 148253, 4273884, 427435, B32B 1508, B32B 2700

Patent

active

056838166

ABSTRACT:
Zinciferous and/or aluminiferous metal surfaces can be passivated by treatment with a chromium-free aqueous solution of phosphoric acid and molybdenum that is at least partially in a valence state lower than +6, to produce, especially with an acrylic overcoating, a surface as resistant to corrosion as the surface of the same substrate after passivation with conventional liquid compositions that contain hexavalent chromium.

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Molybdate-Based Alternatives to Chromating as a Passivation Treatment for Zinc, Tang et al., Plating and Surface Finishing, Nov. 1994, pp. 20-23.
Chromate-free Surface Treatment: MolyPhos--A New Surface Conversion Coating for Zinc. Optimising the Treatment by Corrosion Testing, Bech-Nielsen et al., Euro. Fed. Corrosion Pub., 194, v. 12, pp. 195-197, no date.

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