Molybdenum phosphate based corrosion resistant conversion...

C - Chemistry – Metallurgy – 23 – C

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C23C 22/40 (2006.01) C23C 22/42 (2006.01)

Patent

CA 2347724

Improvements in MolyPhos corrosion resistant coatings for zinc plated surfaces and zinc alloy surfaces are presented, which enhances corrosion protection in marine environments, and other corrosive atmospheres. In particular a cerium fluoride stabilized MolyPhos coating, and organic acid stabilized coatings are provided, which improve resistance to standard salt fog test exposures to at least 300hrs, thus extending applicability of a conventional MolyPhos coating to applications to telecommunications, electronics, automotive and aviation equipment. MolyPhos coatings offer promise as an environmentally friendly alternative to conventional chromate corrosion coatings.

Revêtements améliorés résistants à la corrosion à base de phosphate de molybdène (MolyPhos) pour surfaces recouvertes de zinc et surfaces recouvertes d'alliage de zinc dans des environnements marins et d'autres milieux corrosifs. La présente invention concerne, en particulier, un revêtement MolyPhos stabilisé au fluorure de cérium et des revêtements stabilisés à l'acide organique qui améliorent la résistance à l'exposition aux brouillards salins, dans le cadre des tests standard, à au moins 300 heures, ce qui étend ainsi l'applicabilité d'un revêtement MolyPhos classique aux équipements de télécommunications, électroniques, automobiles et de l'aviation. Lesdits revêtements MolyPhos sont prometteurs en tant qu'alternative sans danger pour l'environnement aux revêtements anticorrosion classique à base de chromate.

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