CPC C25D 11/022 (2013.01) [C25D 11/024 (2013.01)] | 20 Claims |
1. A composition for selective anodization, said composition comprising:
amidosulphuric acid, magnesium sulphate and concentrated sulphuric acid as a base electrolyte, and additionally sodium stannate and/or molybdenum oxide, wherein the composition is free of chromium trioxide.
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