Fretting corrosion under controlled atmospheres

Abstract : Connector is composed of a female and male part which induced vibrations from the vehicle might lead to relative movement between these two parts. A relative movement of the contact zone between the pin and the spring can lead to the formation of an irreversible mechanical degradation and electrical perturbation by the formation of third-body layer at the interface. This is the fretting corrosion phenomenon in electrical contact, it depends of the contact materials used, the atmosphere and many others physico-chemicals parameters like moisture, force contact. Commonly, tin is used, for economic reasons, to coat and protect the substrate made of copper. Oxygen reacts with soft tin and formed hard and brittle layer of tin oxides at the surface, which become remains under vibrations stresses. This causes high degradation until reach the substrate and formate oxidized copper remains. The conduction of current could be disturbed through this granular layer composed of insulated (oxide) and also conductive remains (non-oxides). This study is about the measurement of electrical behaviour of metallic connectors under two kinds of atmospheres: air and nitrogen as an inert gas. The use of air atmosphere shows a typical augmentation of the amplitude of the contact voltage, than the introduction of nitrogen gas flow directly at the interface induces a diminution of the contact voltage. This behaviour is fast and highlights the evacuation and the production of remains which is not so well understand. This dynamism of contact voltage provides new information about degradation, to understand the fretting-corrosion phenomena.
Type de document :
Communication dans un congrès
ICEC 2016 - 28th International Conference on Electric Contacts, 2016, Edinburgh, United Kingdom
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https://hal-univ-rennes1.archives-ouvertes.fr/hal-01631751
Contributeur : Laurent Jonchère <>
Soumis le : jeudi 9 novembre 2017 - 16:27:24
Dernière modification le : mercredi 16 mai 2018 - 11:23:26

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  • HAL Id : hal-01631751, version 1

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Julien Labbé, E. Carvou, R. El Adbdi, S. El Mossouess, C. Plouzeau, et al.. Fretting corrosion under controlled atmospheres. ICEC 2016 - 28th International Conference on Electric Contacts, 2016, Edinburgh, United Kingdom. 〈hal-01631751〉

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