An essentially chromium(VI)-free, chromium(III)-containing corrosion resistant conversion solution, or layer thereof for treating metals such as zinc, zinc alloy, aluminum, or aluminum alloy substrates. The conversion solution, contains a monocarboxylo acid, and is substantially free of chromium(III)-chelates, is capable of producing thick conversion films even at low temperatures, has good corrosion resistance, and is self healing with regard to scratches and the like.
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