Abstract
The present investigation deals with the chemical deposition of Ni-P-W coating on mild steel substrate and optimization of multiple surface roughness characteristics on the basis of different coating process parameters. Three coating parameters which are varied to have the optimum condition are concentration of nickel source, concentration of reducing agent, and concentration of tungsten source. Five different roughness parameters, namely, centre line average (Ra), root mean square roughness (Rq), skewness (Rsk), kurtosis (Rku), and mean peak line spacing (Rsm) are considered. Weighted principal component analysis (WPCA) method is adopted to convert the multiple-response problem into a single performance index and Taguchi L27 orthogonal array is used. ANOVA is performed to find the significance of the each coating process parameters and their interactions. The EDX analysis, XRD analysis, and SEM are performed to study the composition and structural aspects.
Highlights
Among the different surface engineering methods, application of a coating is the most popular one
At present among the coatings deposited by aqueous means, electrolytic method enjoys the larger share compared to the electroless method
A remarkable improvement in the wear resistance of the binary coating has been reported when hard particles are incorporated [6]. Another effective method to improve the properties of these coatings is alloying
Summary
Among the different surface engineering methods, application of a coating is the most popular one. Coating deposition is generally carried out in an aqueous medium by electrolytic or electroless (chemical deposition) method In this way, pure metals and a wide range of alloys can be deposited. A remarkable improvement in the wear resistance of the binary coating has been reported when hard particles are incorporated [6] Another effective method to improve the properties of these coatings is alloying. The incorporation of tungsten in to the nickel matrix led to the solute hardening, enhanced the hardness, and exhibited excellent properties such as mechanical properties, tribological properties, and corrosion resistance Another important aspect of this type of coating is surface roughness which has to be maintained within a tolerable range. WPCA method is adopted to convert the multivariate problem in to a single performance index Taguchi method is employed to find the optimum coating parameter combination
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