Effect of Surface Treatment on Wear Resistance of Steel Fittings
Author of the article:NIU Haijun;SI Jiajun;ZHU Kuanjun;ZHOU Lixian;LIU Shengchun;ZHU Xiaoqiang;SHI Xiaolong
Author's Workplace：China Electric Power Research Institute Co.,Ltd.,Beijing 102488,China;Jiangsu Tiannan Power Equipment Co.,Ltd., Rugao 226500,China
Key Words：aluminizing fittings friction and wear mechanical properties microstructure
Abstract：
The weight loss rate, wearing morphology, surface hardness of the aluminized steel, galvanized aluminum and fitting under the different friction and wear conditions were studied to reveal the wear resistance mechanism of the aluminized fitting. The results show that the weight loss rate of aluminized steel is significantly lower than that of galvanized aluminum and fittings with the increase of loading force. The wear morphologies of the three samples are spalling, a small amount of spalling and a large number of tearing, and tearing, respectively. The surface hardness of the hot dipped aluminum specimen, with an aluminizing layer of 150 μm, reach 640 HV, and the surface hardness of the aluminized steel decrease with the increase of the loading force. There are a large number of irons, aluminum and their oxides in the form of Fe2O3 and Al2O3in the coating of aluminized steel after wearing, respectively. The higher abrasion resistance of the coating of aluminized steel fitting is due to the protective effect of the Fe-Al alloy layer than the others.
