Method of pickling articles of copper and metals less noble than copper

US6168670A · kind A · utility

Assignee

• LPW-Blasberg Anlagen GmbH · DE

Inventors

• Andreas Möbius · Kaarst, DE
• Wolfgang Thiele · Eilenburg, DE

Key dates

• Filing date: Sep 17, 1998
• Grant date: Jan 2, 2001
• Expiry date: Sep 17, 2018

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23G1/14
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Articles of copper and brass can be uniformly pickled in a solution utilizing peroxosulfate as the active agent when the concentration of additives in the form of organic sulfur compounds, inorganic sulfur compounds, organic sulfur-free nitrogen compounds, and inorganic sulfur-free nitrogen compounds are increased to increase the current yield, when the speed of the solution of less noble metals than copper is inhibited and when an organic complex former is added to the pickle.