| 简介 |
It is a method for producing a structured hard chromium layer specified, wherein chromium is deposited from an electrolyte onto a workpiece, including : (a) Cr (VI)-compound in an amount, corresponding to the contains 50 to 300 g/L of chromic anhydride ; (b) 10 g/L sulphuric acid 0.5 g/l to ; (c) 5 g/L to 15 g/L of aliphatic sulphonic acid having 1 to 6 carbon atoms; wherein the electrolyte substantially no compound selected from ammonium, alkali and [...], ammonium, alkali and alkaline-earth vanadate and ammonium, alkali and alkaline-earth zirconate worked with a cathodic current efficiency of 12% or less and wherein is. Also is a method for preparing a coating, a structured hard chromium layer, a coating and an electrolyte specified. |
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