Patent ID: 6176937
Filing Date: 2001-01-23
Classification: C01B,C23F,C23G,Y10S

Abstract:
A process for treating a metal surface of a workpiece with an acidic solution containing or into which is introduced hydrogen peroxide and a stabilizer for the hydrogen peroxide, said process comprising:contacting the workpiece with the acidic solution containing said hydrogen peroxide and said stabilizer; andmaintaining the workpiece in contact with the acidic solution until a fraction of an oxide layer on the metal surface of the workpiece has been removed, said stabilizer for the hydrogen peroxide consisting of:a) from 100 to 150 parts by weight of a hydroxybenzoic acid;b) from 50 to 120 parts by weight of a hydrotropic aryl sulphonic acid; andc) from 2.5 to 6 parts by weight of a hydrophobic alkaryl sulphonic acid.