Author(s)

Jiazhu Li^1*, Yanjing Li², Xiaohua Tian², Ling Zou², Xing Zhao², Sanfeng Wang², Shenggang Wang³

¹Beijing Blue Chemicals Centre, Beijing, China.
²Prof. Jiazhu Li Laboratory, Wuhan Desytek Environment Protection & New Materials Co, Ltd, Wuhan, China.
³Institute of Metal Research, Chinese Academy Sciences, Beijing, China.

The formulation of hard chromium plating from trivalent chromium electrolyte and its related process have been intensively studied in this work. Through optimized conditions, the coating hardness can achieve more than HV_0.1900 without any treatment and HV_0.11700 after heat treatment for five minutes at 300°C, and the thickness of hard chromium coating was about 100 μm. The hard chromium coatings show good adhesion on the carbon steel and low alloy structural steel. The corrosion resistance of hard chromium coatings was enhanced by the adding nanometer materials into trivalent chromium plating coatings. More than 120 hours salt spray corrosion resistance can be achieved with 40 to 50 microns thickness of trivalent chromium plating coatings.

Corrosion Resistance, Nanometer Materials, Hard Chromium, Trivalent Chromium

Li, J. , Li, Y. , Tian, X. , Zou, L. , Zhao, X. , Wang, S. and Wang, S. (2017) The Hardness and Corrosion Properties of Trivalent Chromium Hard Chromium. Materials Sciences and Applications, 8, 1014-1026. doi: 10.4236/msa.2017.813074.