| 摘要 |
For the purpose of increasing the current efficiency in a process for the deposition of hard chromium on workpieces of a metal alloy from an aqueous electrolyte containing chromic acid and sulphuric acid, a saturated aliphatic sulphonic acid with a maximum of two carbon atoms and a maximum of six sulphonic acid groups or their salts or halogen derivatives is added and operation is with a concentration of more than 0.5 g/l of the organic substance, with a bath temperature of 20 DEG to 70 DEG C and with a current density of 15 to 100 A/dm<2>. A working cathodic current efficiency of over 20% is achieved. |
