Abstract
Corrosion behavior of austenitic stainless steels type 904L and 316L in 3.5% NaCl solution was studied using eggshell powder (ESP) as an inhibitor. The experimental testing method was carried out using gravimetric and potentiodynamic polarization techniques. The testing results showed lower corrosion rate values with ESP, indicating the stainless steels corrosion resistance was influenced by the inhibitor and the chemical composition of 904L and 316L respectively. The morphological changes on stainless steel are checked with and without ESP, at its optimal concentration. Stainless steel 904L has higher impedance magnitude compared to stainless steel 316L at all concentrations of inhibitor studied in the sodium chloride solution. It was concluded that ESP is mixed type in nature; this conclusion was achieved by comparison of changes in the cathodic and anodic Tafel slope values.
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