Chromium (VI)-free conversion layer and method for producing it

Details Chromium (VI)-free conversion layer and method for producing it Chromium (VI)-free conversion layer and method for producing it

2005-09-20

2005-09-20

Koehler, Robert R. (Department: 1775)

Stock material or miscellaneous articles

Composite

Of metal

C148S247000, C148S251000, C148S258000, C148S265000, C148S267000, C148S268000, C148S273000, C148S274000, C148S283000, C148S284000, C427S430100, C427S435000, C428S628000, C428S629000, C428S632000, C428S658000, C428S659000

Reexamination Certificate

active

06946201

ABSTRACT:
A chromium(VI)-free, chromium(III)-containing and substantially coherent conversion layer on zinc or zinc alloys presenting, even in the absence of further components such as silicate, cerium, aluminum and borate, a corrosion protection of approx. 100 to 1000 h in the salt spray test according to DIN 50021 SS or ASTM B 117-73 until first attack according to DIN 50961 Chapter 10; being clear, transparent and substantially colorless and presenting multi colored iridescence; having a layer thickness of approx. 100 nm to 1000 nm; and being hard, adhering well and being resistant to wiping.

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