Abstract
The efficiency of 2, 3, 5-triphenyl tetrazolium chloride (TTC) as an inhibitor for acid corrosion of hot-rolled low carbon steel was studied. The effect of TTC on the corrosion rate was measured in 5 N H 2SO 4 at various temperatures and concentrations. It was found that TTC has a significant inhibiting effect on the corrosion of the metal; protection efficiencies approaching 97% were measured. The inhibitor shifts the free corrosion potential in the anodic direction and polarizes both the cathodic and the anodic half-reactions. The effect is more pronounced for the anodic half-reaction near the corrosion potential. It changes the apparent activation energy of corrosion to a value characteristic of diffusion processes.
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