Evolution of microstructure and electrochemical corrosion behavior of CuZn-based alloys induced by cold rolling

Abstract

In this work, we investigated the influence of thickness reduction on the microstructure, mechanical properties and electrochemical corrosion resistant of the cold-rolled CuZn-based alloy. With the increase of thickness reduction from 50% to 80%, the orientation degree, the content of Sn-rich phase and pore defects of the alloys were all increased. While the compressive stress, tensile strength, electrochemical corrosion potential and corrosion current density were firstly increased with the increase of thickness reduction, then decreased when the thickness reduction was further increased to 70%. The variation of the mechanical properties and electrochemical corrosion resistant of the CuZn-based alloys was due to the variation of orientation, compressive stress, the content of precipitated phase and pore defects which was induced by the increase of dislocation density and vacancies, and the dynamic recovery and recrystallization during cold rolling process.

Keywords

• CuZn-based alloy
• Cold rolling
• Microstructure
• Corrosion
• Residual stress