Effect of heat treatment temperature on microstructure and properties of environmentally friendly chromium layer of narrow and deep groove parts

doi:10.13251/j.issn.0254-6051.2021.02.025

Abstract

Abstract: Chromium coating was prepared on narrow and deep groove parts by using environment-friendly trivalent chromium electroplating process, and then heat treated at different temperatures (0-400 ℃) to investigate the effect of heat treatment temperature on the microstructure and properties of the chromium coating. The micromorphologies, phase structure, microhardness, bonding force and wear resistance of the chromium coating before and after heat treatment were analyzed. The results show that there are micro-cracks on the surface of the as-electroplated coating, and the micro-crack gap expands after the heat treatment. As the heat treatment temperature increases, the structure of the coating gradually changes from amorphous to crystalline, and the microhardness, binding force and wear resistance can be improved. When heat treated at 400 ℃, the microhardness, bonding force and wear resistance are improved, reaching the best value of 781 HV0.1, over 40 N and the smallest wear volume 0.0136 mm³, respectively.

Key words: narrow and deep groove parts, chromium coating, heat treatment temperature, performance, environmental protection

CLC Number:

TG156

Hong Zikang, Luo Yilan, Zhu Qiaolian, Zhu Shigen. Effect of heat treatment temperature on microstructure and properties of environmentally friendly chromium layer of narrow and deep groove parts[J]. Heat Treatment of Metals, 2021, 46(2): 144-148.

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