Research on Friction Wear Characters and Microcosmic Mechanism of Galvanized Sheets

Abstract

Wear tester UMT-2 was used to study the friction wear characters of galvanized sheets under dry friction and oil lubrication. Three-dimensional morphology instrument WYKONT11 was used to observe the width and maximum depth of wear scars, surface roughness and surface topography. Energy Dispersive Spectroscopy (EDS) analysis of zinc coating compositions and tests of micro hardness were carried out. Then, the friction wear mechanism of galvanized sheets was preliminary discussed. The experimental results indicate that, under dry friction, galvanized sheets experience three stages: run-in wear, abrasive wear and adhesive wear. Meanwhile, zinc coatings exfoliate until they lose efficacy. Good lubrication is propitious to protect zinc coatings and it can reduce friction wear. The research results can provide guidance for formability analysis and mold design of galvanized sheets.