| 摘要 |
A chromate-free, chromic and substantially coherent conversion layer based on zinc or zinc alloys offers a protection against corrosion from about 100 to 1000 h, as proven by the salt spray test of DIN 50021 SS or ASTM B 117-73 to first corrosion as described by DIN 50961, chapter 10, even when it does not contain other components such as silicate, Cer, aluminium and borate. This conversion layer is clear, transparent, substantially colourless and iridescent, is about 100 nm to 1000 nm thick, hard, adheres well and is stable against wiping.
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