Investigation of the Experimental Correlation between Heat Treatment Parameter and Corrosion Behaviour of 718 Series Ni-Fe Superalloy in HCL Solution

The correlation between heat treatment parameter and corrosion behavior of 718 Ni-Fe superalloy was investigated in H2SO4 solution. Spark plasma sintering (SPS) was used in producing the samples which was then heat treated at temperatures of 800OC and 10000C and time of 1 and 2 hours for each temperature. Electrochemical studies were carried out in H2SO4 medium, using potentiodynammic anodic polarization techniques. It was observed from the results that the heat-treated alloy showed better corrosion resistance than the untreated alloy. Heat treatment temperature and time have great influences on the corrosion behavior and morphology of the alloy. An optimal protection efficiency of 55.29% was given by sample heat treated at 8000C for 2hours.it has been established that heat treatment can be used to improve the corrosion resistance of the alloy.