Temperature induced wear mechanism transition of Ni-Co-W alloy coatings

Article Materials Science, Coatings & Films

Electrodeposition and wear behavior of NiCoW ternary alloy coatings reinforced by Al2O3 nanoparticles: Influence of current density and electrolyte composition

Zhongquan Zhang et al.

Summary: Al2O3 nanoparticles incorporated NiCoW ternary alloy coatings were synthesized by direct current electrode-position from sulphate-citrate electrolyte. The influence of applied current density and electrolyte composition on the evolution of surface morphology, element composition, microstructure, microhardness and sliding wear behavior of the as-deposited coatings was investigated. The as-deposited coatings exhibit colony surface morphology and the inter-colony boundaries lead a leaf vein-like cross-sectional structure. The composition of the as-deposited coatings is controlled by the induced co-deposition mechanism and the competition among the reductions of Ni, Co, Ni-W and Co-W. The as-deposited coatings change from crystalline to amorphous structure with the decrease of Ni content in coatings and the critical Ni content for the transformation is about 40 at.%. The incorporation of Al2O3 nanoparticles leads to a little increase of microhardness, degrades adhesive wear and oxidation wear, then significantly improve wear resistance. Variations in electrodeposition conditions lead the as-deposited coatings with different wear behavior, including abrasive wear, adhesive wear and oxidation wear, accompanying with plastic deformation. An attempt is made to establish the relationship between the electro-deposition conditions and wear behavior.

SURFACE & COATINGS TECHNOLOGY (2022)

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Article Materials Science, Multidisciplinary

A novel synthesis method for functionally graded alloy coatings by induced electrodeposition

Zhongquan Zhang et al.

Summary: A novel method for synthesizing functionally graded alloy coatings using induced co-deposition has been proposed in this paper. The graded NiCoW alloy coatings were synthesized by galvanostatic, direct current electrodeposition from a sulphate-citrate electrolyte. The competition between the formation of Ni complexes and Co complexes as well as the competition between induced deposition of W and direct deposition of Ni during electrodeposition are responsible for the formation of graded NiCoW coatings.

MATERIALS LETTERS (2022)

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Article Materials Science, Coatings & Films

Influences of Co and process parameters on structure and corrosion properties of nanocrystalline Ni-W-Co ternary alloy film fabricated by electrodeposition at low current density

Weiwei Zhang et al.

Summary: This paper focuses on the electrodeposition of nanocrystalline Ni-W-Co ternary alloy film on copper substrate. The effects of electrodeposition parameters on the structural, compositional, surface characteristics, and corrosion properties of the alloy were investigated. It was found that the alloy has a uniform, compact, and flat surface with colony-like morphology. The crystalline structure and surface roughness are greatly influenced by the current density, bath pH, and plating time. Co content has little effect on crystallite size. The composition of the alloy shows a decrease in nickel content and an increase in Co content. The optimized process parameters for corrosion and wear resistance were determined.

SURFACE & COATINGS TECHNOLOGY (2022)

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Article Materials Science, Multidisciplinary

Microstructure and diffusion behavior of Co-Ni-W conversion coating for metallic interconnect of solid oxide fuel cell

Jiatao Zhou et al.

Summary: In this study, a new Co-Ni-W alloy layer containing 5.0 at.% W was electroplated on the surface of SUS 430 stainless steel and oxidized at 800 degrees C in air for 1000 h. The study confirmed that the oxide layer structure eventually evolved into six oxide layers, with four Cr-free oxide layers effectively preventing the outward diffusion of Cr. Additionally, the Co-Ni-W coating significantly reduced the area specific resistance of the sample.

MATERIALS CHARACTERIZATION (2022)

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Article Engineering, Mechanical

Combined effect of abrasive particle size distribution and ball material on the wear coefficient in micro-scale abrasive wear tests

Pamella Jureves Esteves et al.

Summary: The study found that changing the ball material can alter the behavior of the wear coefficient and affect the influence of particle size distribution on the wear coefficient. The analysis of wear coefficients in each case resulted in a map describing the combined influence of granulometric distributions of abrasive particles and ball material on the wear coefficient.

WEAR (2021)

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Article Engineering, Mechanical