Corrosion of silver electrical contacts: The substrate influence

Dervos, CT; Vassiliou, P

dc.contributor.author	Dervos, CT	en
dc.contributor.author	Vassiliou, P	en
dc.date.accessioned	2014-03-01T01:49:48Z
dc.date.available	2014-03-01T01:49:48Z
dc.date.issued	2000	en
dc.identifier.issn	0048-7538	en
dc.identifier.uri	https://dspace.lib.ntua.gr/xmlui/handle/123456789/25929
dc.subject.classification	Electrochemistry	en
dc.subject.classification	Metallurgy & Metallurgical Engineering	en
dc.subject.classification	Materials Science, Coatings & Films	en
dc.subject.other	CHARGE INJECTION RATES	en
dc.subject.other	METAL CONTACTS	en
dc.title	Corrosion of silver electrical contacts: The substrate influence	en
heal.type	journalArticle	en
heal.language	English	en
heal.publicationDate	2000	en
heal.abstract	Silver and silver based alloy (90% Ag- 10% CdO) contacts welded on different substrate materials have been exposed in hostile SO2 environments in simulated laboratory conditions. The corrosion byproducts on the surface have been monitored by SEM and EDS spectroscopy. Their electrical characterization was based upon de overheat tests, current switching cycle tests and interfacial energy storage during ac current excitation. The experimental results demonstrate that the heat dissipation rates strongly depend on the substrate material selection as well as, the exposure environments. These parameters strongly affect the nominal current values. The dynamic contact resistance during make-break electrical contact operations depends upon the conductivity of the new surface layers formed as a result of chemical equilibrium established by the reaction between the environment and the primary surface material, the substrate, and the welding layers. Corrosion byproducts are formed over the contact joint and are transported to the silver surface of the electrical contact by creep. The resulting byproducts, may be either loosely attached or water-soluble. Corrosion products originate from the welding zone, the substrate material, and the underplating layer by diffusing through the pores of the plating; they aggregate on the surface and affect the heat dissipation rate and consequently the electrical performance of the component.	en
heal.publisher	FREUND PUBLISHING HOUSE LTD	en
heal.journalName	CORROSION REVIEWS	en
dc.identifier.isi	ISI:000086524000010	en
dc.identifier.volume	18	en
dc.identifier.issue	2-3	en
dc.identifier.spage	267	en
dc.identifier.epage	294	en