Abstract
The present study was aimed to analyze the effect of heat treatment on phase change of thin layer of nickel on steel plate substrate. The coating process was electroless plated using chemical solution. This work requires nickel solution as the main component of coating. Substrate was coated by electroless nickel plating at pH 7.5 and temperature was 85 ℃ for 100 minutes with heat treatment for 30 minutes at temperature are 320 ℃ and 340 ℃. Furthermore, the substrate will be analyzed with metallography method to obtain visualization of thickness on plate surface. The result show that the layer on steel surface has a uniform thickness. Based on the hardness test, the heated plated resulting the better performance compared with the non-heated one. Surface hardness increased from 134VHN to 646VHN with a coating thickness of 17.49μm and a XRD characterization showed a broadened Ni peak. After heat treatment at temperature are 320℃ and 340℃, the surface hardness increased up to 851VHN and 1020VHN.
Highlights
In many industry companies, components of equipment used are generally steel materials
The nickel layer produced by Electroless nickel plating (ENP) is commonly uniform on entire substrate surfaces, both external and internal, so that it can be used for coating workpiece with complex shapes
The microstructure of the nickel layer is not seen in metallographic results
Summary
Components of equipment used are generally steel materials. Surface engineering generally is aimed to increase the hardness and corrosion resistance of the components that rub against each other and produce the durable components for industrial tool and equipment. Electroless nickel is an alternative method to avoid hydrogen embrittlement It produces layer with uniform thickness and good corrosion resistance. Research was conducted on the effect of the parameters on electroless nickel to get the maximum hardness value. These parameters include the composition of the solution, pH of the solution, temperature, and time. Heat treatment after performing electroless nickel is done to increase the hardness of the coating. Temperature and time in the heat treatment process affect to the final hardness of the layer [4]. The phase formed in the layer was analyzed to determine the cause of the increase in hardness after heat treatment in the ENP layer
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