Study Thermodynamic and Kinetic Diphenylamine – 4 – Sulfonic Acid Sodium Salt as a new inhibitor on corrosion stainless steel 304

This study uses electrochemical thechniques such as linear sweep voltammetry (LSV) and the use of Tafel chart was investigated at different temperatures. It was found that this inhibitor at 15℃ had the best inhibitory effect on stainless steel 304, at this temperature the percentage of deterrence is 98%. Using the adsorption isotherm of Langmuir, the absorption heat and entropy changes were calculated in the process of absorbing this inhibitor on the surface. As the temperature increases, the strength of the inhibitory bond decreases with the surface. And the inhibitors of absorption on the surface will be reduced. And Tafel showers, the corrosion rate increases at high temperatures. Also, at high temperatures entropy, the absorption inhibitory process increases on the surface.