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Paper Details

Corrosion Inhibition Study of Stainless Steel in DTPMP SG by Acidic Environment

P. Selvakumar1,*, B. Balanaga Karthik2, and C. Thangavelu3

Journal Title:Journal of Chemical, Biological and physical sciences

Gravimetric method is used to study the temperature effects on stainless steel corrosion in 0.5M H2SO4 solutions in the absence and presence of diethylenetriaminepenta (methylene phosphonic acid) (DTPMP) and sodium gluconate (SG). The combined inhibition efficiency offers 200 ppm DTPMP and 100 ppm SG is 91%. The synergistic effect of the inhibiting compound is calculated. The negative values of (?Gads) in the acid media ensure the spontaneity of the adsorption process. The adsorption of the inhibitor molecules on the stainless steel surface obeys Langmuir adsorption isotherm and occurs spontaneously. The thermodynamic parameters of activation energy are calculated. These thermodynamic parameters show strong interaction between inhibitor molecules and stainless steel surface.