Effect of MoS2 Concentration on Microstructure and Tribological Behavior of Electrophoretic-Electrodeposited Ni-Co-Al2O3-MoS2 Composites

Abstract

Ni-CoAl 2 O 3-MoS 2 composite coatings were prepared on the surface of LY12 aluminum alloys by electrophoresis-electrodeposition with different MoS 2 concentrations. The microstructure, morphologies and composition of Ni-CoAl 2 O 3-MoS 2 composites were characterized by X-ray diffractometer (XRD) and scanning electron microscopy (SEM) equipped with energy dispersive spectroscope (EDS). The micro-indentation hardness as well as friction and tribological properties of the coatings were tested by micro-hardness tester and friction and wear tester separately. Results revealed that the composite coating fabricated at 1.0 g⋅L-1 MoS 2 achieved dense structure, and the average thickness of the coating was 39.820 µm. The micro-indentation hardness of the composite coating was decreased from 578 HV to 465 HV with the increase of MoS 2 concentration. Also, the composite coating synthesized at 1.0 g•L-1 MoS 2 had the lowest friction coefficient and wear rate.

Effect of Rare Earth on the Corrosion Resistance of Electroless Ni-Mo-P Composite Coatings

“…However, high chemical reactivity of magnesium alloys is susceptible to corrosion and wear resistance, which hinders its widespread development [5][6][7] . Therefore, numerous surface modification techniques such as chemical transformation 8 , microarc oxidation 9 , chemical vapor depositions 10 , Electrodeposition 11,12 and electroless plating 13 are presented for obtaining corrosion resistant coatings on magnesium alloys.…”

Effect of Na2WO4 Concentration on the Microstructure and Corrosion Behavior of Ni-W-P Ternary Alloy Coatings

“…For this purpose, the effective way of preventing corrosion is through the formation of a protective coating which acts as the barrier between the corrosive medium and the substrate [9][10][11] . Among various surface treatments 12,13 , environmentally friendly electroless plating without external power is advantageous to form a uniform and crack-free coating [14][15][16][17][18] . Therefore, electroless may be a promising candidate to face with the inevitable problems and extend the use of magnesium alloys 19,20 .…”