Electrical plug-type connector

US4138604A · kind A · utility

Assignee

• W. C. Heraeus GmbH · DE

Inventors

• Nils Harmsen · Bruchköbel, DE
• Horst Markhof · Bruchköbel, DE
• Walter Reichelt
• Klaus-Ludwig Schiff · Bruchköbel, DE
• Horst Thiede · Bruchköbel, DE

Key dates

• Filing date: Jul 16, 1976
• Grant date: Feb 6, 1979
• Expiry date: Jul 16, 1996

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10S439/931
• WIPO field: Electrical machinery, apparatus, energy
• WIPO sector: Electrical engineering

Abstract

To provide low contact resistance, long life, and resistance against tarnishing under corrosive, particularly sulfur atmospheres, a substrate carrier has a layer of palladium applied thereto, of a thickness between 0.5 and 5 .mu.m, preferably between 1 and 3 .mu.m, to which a coating of gold is applied which is porous and has a thickness of only between 0.05 .mu.m and 0.1 .mu.m; the porous gold coating forms islands of gold on the palladium which, in use and as the terminal is wiped against a counter element, smears over the palladium, thus effectively covering the palladium, preventing tarnishing, and maintaining low contact resistance throughout the useful life of the terminal element.