Poly (N, N-dimethyl aniline) Coating for Stainless Steel, Synthesis, Characterization and Corrosion Protection in Sea Water 3.5% NaCl Solution

This research involves the synthesis of conductive polymer includes: poly (N, Ndimethyl aniline) on metal surface which is stainless steel 316 by using electrochemical polymerization technique. Parameters of this research are voltage rang, scan rate, number of cycles. The tests for corrosion protection of the polymer coated and uncoated stainless steel substrate was investigated in artificial sea water of 3.5% NaCl solution by tafel and potentiodynamic procedures. Fourier Transform Infrared Spectroscopy (FTIR), UV-Visible absorption spectroscopy, Scanning Electron Microscope (SEM) and Atomic Force Microscope (AFM) were used to diagnose and describe the structure and morphology of the coating. Parameters of corrosion are: corrosion current Icorr, corrosion potential Ecorr, protection efficiency (PE %), polarization resistance (Rp) and the effect of different temperatures range (293 to 323) K in the inhibition efficiency of coated and uncoated stainless steel surface. Change in the free, enthalpy and entropy have been determined. Apparent energies of activation have been calculated for the corrosion process from the corrosion rates and Arrhenius plots. This results of corrosion test showed that Poly (N, N-dimethyl aniline) ensure chemically stable, environmentally viable and have good corrosion protection of stainless steel in artificial sea water of 3.5% NaCl solution.