Electrochemical behavior of electroless Ni-W-P alloy deposit on carbide substrate in 3.5wt% salt solution

Muhamad Naim, Kasful Anuar (2014) Electrochemical behavior of electroless Ni-W-P alloy deposit on carbide substrate in 3.5wt% salt solution. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

This study is focusing more on coating hard metal such as tungsten carbide (WC) that commonly utilized as cutting tools to improve its wear resistance, durability and hardness properties to obtain a proper workpiece surface quality. Electroless nickel (EN) is one of the excellent coating techniques that can provide high hardness, uniform thickness even in complex parts, as well as excellent corrosion and wear resistance. Various plating bath with different value of pH will be utilized to investigate the effect of plating bath pH on electroless Ni-W-P deposition composition. Analysis of coating properties will be done to analyze the surface morphology of the alloy coating by means of scanning electron microscopy (SEM) while energy-dispersive x-ray spectroscopy (EDX) and x-ray diffraction (XRD) are used to study the composition of nickel, tungsten and phosphorus contents in the ternary alloy coating on the WC substrates. The investigation of the hardness of the ternary alloy deposition will be evaluated by means of Vickers Hardness Tester. Corrosion behavior will be investigated in 3.5 wt. % sodium chloride (NaCI) solution by conducting electrochemical measurement. EDX analysis showed phosphorus content decreased gradually that made the rate of deposition increased as pH value increased. Furthermore, it also showed the amount of tungsten increased that result the increasing of hardness by means of hardness test. Electrochemical behavior showed that coated substrate resulting better corrosion rate than mild steel although poorer corrosion rate that stainless steel and also coated substrate did not exhibit any passive area.

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