Optimization of Ni-Cr Alloy Coatings Produced Using the Electrodeposition Method

Electrodeposition method is an important technique for obtaining metal, alloy or composite coatings. Ni-Cr alloy coatings obtained by electrodeposition method are preferred especially in corrosive environments. This study is about obtaining Ni-Cr alloy coating by electrodeposition method and determining optimization parameters using Taguchi method, which is one of the experimental design methods. Taguchi method has been used to determine the experimental parameters due to the excess of parameters in the electrodeposition method. For this purpose, Taguchi L9 orthogonal array was chosen. As a parameter; three different levels of pH, temperature, current density and stirring rate were used. Since Ni-Cr coatings are preferred in corrosive environments, the effects of the factors affecting the coating on the corrosion results obtained by the tafel extrapolation method were investigated by signal-to-noise ratio, average effects and variance analysis. Corrosion rates (mm / year) of the curves obtained using the Tafel extrapolation method were determined. Among the experiments, the best result was given by pH 2.5, temperature 40 °C, current density 200 mA/cm² and the sample without stirring. In addition, it has been confirmed by scientific and statistical studies that current density has dominant effects on Ni-Cr corrosion results.