Comparism of Corrosion Inhibitory Effect of 4-[(3,4-Dimethoxybenzylidene)Amino]-1,5- Dimethyl-2-Phenyl-1H-Pyrazol-3(2H)-One in H2SO4 and HCl Environment.

The inhibition ability of Schiff base, 4-[(3,4-Dimethoxybenzylidene)amino]- 1,5-dimethyl-2-phenyl-1H-pyrazol-3(2H)-one on the corrosion of mild steel in 2M H₂SO₄ and HCl was studied by weight loss method.The inhibition efficiency of the Schiff base on mild steel metal was investigated at four temperatures and concentrations. The highest concentration 2x10^-2M of the Schiff base gave inhibition efficiencies of 91%, 89%, 88%,and 60% at temperatures; 30°C, 40°C, 60°C,and 80°C respectively in H₂SO₄ medium, the same concentrations under the same conditions gave inhibition efficiencies of 94%, 95%, 97%,and 98% at temperatures; 30°C, 40°C, 60°C, and 80°C respectively in HCl medium, suggesting that the inhibitor performs better in HCl medium than in H₂SO₄ medium at high temperatures.

Keywords
corrosive environments; temperature; corrosion; Schiff base; mild steel