Evaluation of hardness values and corrosion behavior of laser alloyed 20Al-20Sn-60Ti on UNS G10150 mild steel

摘要

The surface enhancement of engineering materials is necessary for preventing service failure and corrosion attacks. Based on this, the experimental investigation of the effect of laser alloying of mild steel was studied. The laser speed was varied from 0.6 to 0.8 m/min. The characterization of the laser alloyed surfaces was conducted using standard method. The electrochemical test was studied using 1 mol each of H2SO4 and HCl solution. Factorial design and analysis of variance (ANOVA) were used to study the corrosion behavior. The results showed that laser alloyed of 20Al-20Sn-60Ti on mild steel showed better hardness values and corrosion resistance compared to substrate; all the properties improved by increasing the laser speed from 0.6 to 0.8 m/min. The optimum properties were obtained at 20 %Al-20 %Sn-60 %Ti at laser power of 750 W and speed of 0.8 m/min. The samples in H2SO4 solution have a higher corrosion resistance. Factorial design of the experiment can be successfully employed to describe the corrosion behavior, and the developed linear equation model can be used in predicting the corrosion rate within the selected experimental conditions. It has been established that laser alloy of 20Al-20Sn-60Ti on mild steel can be used in improving the surface hardness and corrosion resistance.