Influence of load on the friction coefficient of fretted electro-deposited coatings against steel and zirconia balls

Abstract

This paper investigates the influence of load on the evolution of the kinetic friction coefficient of electro-deposited coatings against steel and zirconia balls. Fretting wear tests are performed with epoxy-based electro-deposited coating and three types of balls (AISI 52100, SUS316L and ZrO2). Loads of 20, 30, 40, and 50 N are induced normal to the contact surface between the electro-deposited coating and a ball. The evolution of the kinetic friction coefficient is determined at various loads. Direct comparison among measured friction coefficient evolutions is carried out. Results show that when testing the coating against AISI 52100 balls at 20 N and 30 N, it wore off after higher fretting cycles than SUS316L and ZrO2 balls. Meanwhile, the coating tested against ZrO2 balls at 40 N and 50 N failed after higher fretting cycles than against SUS316L and AISI52100 balls. Finally, it is identified that the relation between the number of cycles to coating failure and load is expressed with an inverse power law.