Wear and corrosion resistance of Co-P coatings: the effects of current modes

Ruiqian Li; Yuanyuan Hou; Qiujing Dong; Peibo Su; Pengfei Ju; Jun Liang

doi:10.1039/c7ra10830c

Wear and corrosion resistance of Co-P coatings: the effects of current modes

RSC Adv. 2018 Jan 3;8(2):895-903. doi: 10.1039/c7ra10830c. eCollection 2018 Jan 2.

Authors

Ruiqian Li¹, Yuanyuan Hou², Qiujing Dong¹, Peibo Su³, Pengfei Ju³, Jun Liang²

Affiliations

¹ School of Chemistry and Materials Engineering, Fuyang Normal University Fuyang Anhui 236037 China.
² State Key Laboratory of Solid Lubrication, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences Lanzhou 730000 China jliang@licp.cas.cn.
³ Shanghai Aerospace Equipment Manufacturer Shanghai 200245 China.

Abstract

In this work, Co-P coatings were deposited from a chloride-based bath by direct current (DC), pulse current (PC) and pulse reverse current (PRC) methods, respectively. The effects of current modes on the microstructure, composition, microhardness, wear resistance and corrosion resistance of the Co-P coatings were explored. Results showed that the P content in the Co-P coatings increased and the surface roughness decreased in the sequence of DC, PC and PRC methods. The coatings with low P content deposited by DC and PC methods are crystalline with fcc and hcp structures, respectively, while the coating with high P content deposited by the PRC method is amorphous. Comparing to DC and PC methods, the PRC method can evidently improve the microhardness, wear resistance and corrosion resistance of Co-P coatings. The excellent wear and corrosion resistance of the Co-P coatings deposited by the PRC method could be attributed to its high P content, smooth surface and amorphous structure.