Synergistic effect of tartaric acid with 2,6-diaminopyridine on the corrosion inhibition of mild steel in 0.5 M HCl.

In addition, the values of C dl , which can be explained by the Helmholtz model as equation (7) 10 , exhibits a decreasing trend with increase in concentration of inhibitors. where d is the thickness of electric double-layer, S is the surface area of mild steel electrode exposed to 0.5 M HCl solution, ε 0 and ε show the permittivity of the air and the local dielectric constant, respectively.

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