Abstract
The whole world is interested in the metal industry and its permanent development. One of these metals is carbon steel. Therefore, scientists tend to improve the properties of this metal, in this research we have improved the properties of carbon steel through electroless plating process of Ni-P and Ni-W-P alloys. In different industries, electroless nickel-phosphorus Ni-P and nickel-tungsten-phosphorus Ni-W-P deposits have been commonly used as engineering safety coatings. In our research, Ni-P and Ni-W-P were deposited on low carbon steel by using acid bath. To study the improvement of the properties of the coats, microstructure analysis investigated by thin film (XRD), coat’s morphology by electron microscope scan (SEM), analyzing the coat by X-ray dispersive energy (EDX) and protection of corrosion of the coats were determined by potentiodynamic polarization measurements in artificial sea water (3.5% NaCl solution). The results indicated that the phases formed from the electroless coating give excellent corrosion resistance of low carbon steel and also indicated that the alloy formed in the presence of tungsten through the electroless bath give higher corrosion protection than that formed without it. As the concentration of tungstate increase in the bath, coat has higher corrosion protection i.e. Ni-W-P III>Ni-W-P II >Ni-W-P I>Ni-P.
Highlights
Electroless process is an autocatalytic technique that required action of the deposited metal and reduced by the electron obtained [1]
The electroless bath was included in 100 ml glass container which was stored in a water bath at a steady temperature at 85°C
To find out the electrochemical polarization behavior of binary and ternary alloy coatings, potentiodynamic polarization studies were tested in 3.5% NaCl solution at 30°C with scan rate of 0.01 V/sec within a potential range of 0 to 250 mV
Summary
Electroless process is an autocatalytic technique that required action of the deposited metal and reduced by the electron obtained [1]. The resistance of corrosion and character of the crystalline deposit Ni-P could affected by the composition of the alloy and heat treatment [3]. Electroless plated Ni-P coatings are used in a wide variety of sectors, these have several attributes as nice wear, protection of corrosion and a strong degree of hardness [4,5,6,7,8]. Ni based coatings temperature resistance improved by adding tungsten that has high melting point. By heating the deposits of the binary and ternary alloys, the hardness increase [22]. At 400°C show crystallinity of Ni [23]
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