Method for the Pre-treatment of steel parts prior to salt bath nitriding

US5735971A · kind A · utility

Assignee

• Durferrit GmbH Thermotechnik · DE

Inventors

• Georg Wahl · Rodenbach, DE
• Rainer Willing-Lepenies · Rodenbach, DE

Key dates

• Filing date: Nov 28, 1995
• Grant date: Apr 7, 1998
• Expiry date: Nov 28, 2015

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C23C8/58
• WIPO field: Surface technology, coating
• WIPO sector: Chemistry

Abstract

Flawless nitrating layers are obtained during the nitro-carburizing of components made from steels which form passive layers in salt baths if these components are first pre-treated in an oxidizing salt melt at 300.degree. to 500.degree. C. prior to the nitro-carburizing process.