Preparation of Electrodeposited Cr-La Coating and Its Spectral Properties

LIU Xiao-zhen; WANG Gang; SONG Ling-ling; LI Xin; ZHU Xu-qiang

doi:10.3964/j.issn.1000-0593(2011)07-1964-04

Abstract

Cr-La coating(dc) and Cr-La coating(pulse) were prepared by electrodeposition method of direct current and pulsating current respectively. The Cr-La coating (dc) and Cr-La coating (pulse) were characterized with ICP-AES, EDAX, XRD and SEM techniques, respectively. Cr-La coating(dc) was amorphous. There were crystalline La and CrC in Cr-La coating(pulse). The microhardness of the Cr-La coating(dc) and Cr-La coating(pulse) were as high as 860.3 and 930.2 HV respectively, which were higher 11.15% and 20.18% higher than that of the Cr coating (774.0 HV). The wear weight losses of Cr-La coating(dc) and Cr-La coating(pulse) were 1.29 and 2.25 times lower than that of Cr coating, respectively. The friction coefficient of Cr coating, Cr-La coating(dc) and Cr-La coating(pulse) were 0.884, 0.640 and 0.648 respectively. The properties of wear weight loss and microhardness of coatings were improved with pulsating current. The wear weight loss and microhardness of Cr-La coating(pulse) were lower 1.75 time lower and higher 8.13% higher than that of the Cr-La coating(dc), respectively.