Method for removing tin

US5993559A · kind A · utility

Assignee

• Siemens Aktiengesellschaft · DE

Inventors

• Robert Singer · Erlangen, DE
• Peter Krug · Nürnberg, DE
• Winfried Esser · Bochum, DE
• Jurgen Ewald · Mülheim an der Ruhr, DE
• Jurgen Preuhs · Oberhausen, DE
• Adolf Donner · Bochum, DE

Key dates

• Filing date: Apr 16, 1998
• Grant date: Nov 30, 1999
• Expiry date: Apr 16, 2018

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02P10/20
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

In a method for removing tin from a surface and/or from a region close to the surface of a component part, the component part has a concentrated aqueous sodium hydroxide or concentrated hydrochloric acid flowing in contact with it at a temperature which is distinctly higher than room temperature. Preferably, the temperature is approximately 220.degree. C., and the component part is moreover subjected to a positive pressure of 5.5 bar. The method is suitable for a component part fabricated through the use of unidirectional solidification and liquid-metal cooling, in particular a turbine blade.