Titanium electrode having a metallic coating, process for producing it and its use

摘要

A titanium electrode having a lead coating is produced by first cleaning the electrode, then subjecting it to a first pickling treatment with a hydrogen fluoride solution, followed by a second pickling treatment with a solution containing 1 to 3 mol/l chromium trioxide, 1.8 to 2.2 mol/l hydrogen fluoride and 0.3 to 0.7 mol/l zinc oxide, after which an electroplating with lead is carried out.