Tribocorrosion investigation of 316L stainless steel: the synergistic effect between chloride ion and sulfate ion

Tribocorrosion is a failure phenomenon which involves synergistic effect of electrochemical corrosion and mechanical wear. It usually results into early failure of mechanical components than simple wear and corrosion. Chloride (Cl-) and sulfate ions (SO42-) are often found together in corrosive media. In this study, the synergistic effect of Cl- and SO42- SO42- Cl- in corrosive solution from 0.31 M : 0 to 0 : 0.62 M. The stainless steel was worn against with a ZrO2 sphere. The coefficient of friction (COF), material loss volume, surface micro-topographies and surface chemical composition in different solutions were compared to explore the synergism between SO42- SO42- SO42- and Cl- could promote the transmission of metal into oxides. This had two effects on tribocorrosion. First, the existence of oxides would cause abrasion which accelerated wear-affected corrosion and enhanced mechanical wear (corrosion-affected wear). On the other side, the transmission of metal into oxides benefited for the formation of tribo-film. The flexible stainless steel needed to coordinate deformation with the tribo-film which had relatively low deformability. This aggravated deformation of stainless steel and promoted surface work-hardening effect. It was helpful for stainless steel to resist wear, thus, the corrosion-affected wear was decreased.

Automated summary

Tribocorrosion is a failure phenomenon caused by the synergistic effect of electrochemical corrosion and mechanical wear. The presence of sulfate and chloride ions in corrosive media can promote the transformation of metal into oxides, leading to accelerated wear-affected corrosion and surface work-hardening effect. This synergism can affect the resistance of stainless steel to wear by decreasing corrosion-affected wear.