Abstract

The effects of temperature on the corrosion resistance of stainless steel Type 316 in 0.5 M H2SO4 solution using waste material (egg shell powder) as inhibitor was investigated using gravimetric method. Results obtained show that rate of corrosion increases with increase in temperature and exposure time. Addition of inhibitor to the corroding solution lowered the corrosion rate value of stainless steel. The efficiency of the inhibitor decreased with temperature and this is attributed to greater rate of desorption of the inhibitor. Fitting of the experimental data to the Arrhenius equations revealed that the organic constituent of the egg shell powder was adsorbed physically on the stainless steel surface. Adsorption of egg shell on stainless steel surface was found to fit Langmuir adsorption isotherms. The excellent inhibition of egg shell powder was also verified by scanning electron microscope (SEM) equipped with energy dispersive spectroscopy (EDX).

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