Wear Behaviors of Laser Cladded Nickel-Based Alloy Coatings Reinforced by Molybdenum and Cerium Dioxide under Sliding Friction

Abstract

Three kinds of coatings had been prepared on the surface of 45CrNi steel plates using laser cladded technique by adding Mo and CeO2 into the Nickel-based alloys. The wear behaviors of these three kinds of coatings in sliding against Al2O3 grinding ring were investigated by using a MM-200 Wear Tester. The results indicated that the addition of both Mo and CeO2 could improve the wear resistance of Nickel-based alloy coatings. If the original Nickel-based alloy coating was taken as the standard sample, the relative wear resistances of Mo-modified and Ce-modified coatings are 1.31 and 7.54 respectively, and the coefficients of friction appreciably decreased. SEM images of the worn surface of the coatings showed that the wear of original Nickel-based alloy coating was dominated by the mechanism of micro-cutting, and the Mo-modified coating and Ce-modified coating had a feature of fatigue wear in addition to micro-cutting. In sliding, the wearing resistance of Ce-modified coating was higher than the other two. The wear test results were closely related to the microstructures of the coatings.

Induced Codeposition Behavior of Electrodeposited NiMoW Alloys

“…Ni (II) + e − → Ni (I) ads [4] Ni (I) ads + e − → Ni(s) [5] A common adsorption mechanism that has been adopted for the iron-group elements is one where the adsorbed species promotes the reduction of the metal ion, [40][41][42] Ni (II) + e − → Ni (I) ads [6] Ni (I) ads + Ni(II) + 2e − → Ni(s) + Ni (I) ads [7] A similar approach has also been presented by Chassaing and Wiart 43 to describe Ni(II) reduction with Zn(II), where a mixed intermediate,(NiZn) ads + is believed to catalyze the discharge of Ni +2 ions.…”

“…Molybdenum and tungsten alloys with nickel are well known for their outstanding properties, such as superior corrosion resistance, [1][2][3] wear resistance, [4][5][6] and catalytic ability for the hydrogen evolution reaction. [7][8][9][10][11][12] Moreover, their enhanced hardness combined with improved tribological properties (e.g., wear resistance), primarily for the W-alloys, make them ideal for microelectromechanical structures (MEMS) [13][14][15] and micro-tools.…”

Electrodeposition of Mo-Rich, MoNi Alloys from an Aqueous Electrolyte

“…Molybdenum alloys with nickel are well recognized for their superior corrosion resistance [1][2][3] and wear resistance [4][5][6] properties, and outstanding catalytic ability for the hydrogen evolution reaction. [7][8][9][10][11][12] The electrodeposition of these alloys is referred to as "induced codeposition;" 13 molybdenum cannot be reduced alone from an aqueous solution, but can be fully reduced if codeposited with inducing elements, such as iron, nickel and cobalt, the iron-group metals.…”