Influence of the relative humidity and H2S -SO2 polluted air on the fretting wear behavior of silver-plated electrical contacts - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Wear Année : 2022

Influence of the relative humidity and H2S -SO2 polluted air on the fretting wear behavior of silver-plated electrical contacts

Résumé

The use of connectors in electrical devices for automotive industry has significantly increased during the last decades. These connectors need to keep low and stable electrical contact resistance (ECR) otherwise disconnects may occur inducing critical failures. Close to the engine, these connectors are subjected to vibrations inducing fretting wear damage. The aim of this study is to investigate the influence of relative humidity and the presence of pollutant sulfurous gases (H 2 S, SO 2) on the silver-plated electrical contact resistance (ECR) behavior. The ECR fretting endurance Nc (i.e. when ΔR> ΔRth = 4 mΩ) displays a fast increase above RH th(Air)= 50%. The debris layer becomes more conductive so a larger wear volume is required to reach the ECR failure. At the same time, the debris layer becomes more cohesive and the wear rate decreases. Alternatively, synergic interaction between H 2 S, SO 2 gases and relative humidity above RH th(Air&S) = 60% leads to the formation of lubricating Ag 2 S sulphide and Ag 2 SO 4 sulphate tribofilm which, by decreasing the friction coefficient and the silver layer wear rate, sharply increases the ECR endurance. Finally, using simple explicit formulations, both ECR endurances under polluted and non-polluted air are formalized.
Fichier principal
Vignette du fichier
Pompanon_et _al_S02_H2S_manuscript_R1_Corrected.pdf (2.19 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-03766172 , version 1 (31-08-2022)

Identifiants

Citer

F. Pompanon, Siegfried Fouvry, O. Alquier. Influence of the relative humidity and H2S -SO2 polluted air on the fretting wear behavior of silver-plated electrical contacts. Wear, 2022, 508-509, pp.204455. ⟨10.1016/j.wear.2022.204455⟩. ⟨hal-03766172⟩
10 Consultations
70 Téléchargements

Altmetric

Partager

Gmail Mastodon Facebook X LinkedIn More