STUDYING THE EFFECTS OF CORROSION INHIBITORS ON MAGNESIUM ALLOY ZK30 AND HOT DIP GALVANIZED STEEL

This study demonstrates the influence of corrosion inhibitors on the corrosion protection of ZK30 magnesium alloy and Hot Dip Galvanized (HDG) steel. Both Mg ZK30 and HDG steel substrates were exposed to corrosion environment in the presence of various corrosion inhibitors. The inhibitors were selected due to their ability to form insoluble complexes with components of the alloys. The morphology of the exposed alloys was examined by Scanning Electron Microscopy (SEM). The composition and structure were investigated by Energy Dispersive X-Ray Analysis (EDX), X-Ray Photoelectron spectroscopy (XPS) and Fourier Transform Infrared Spectroscopy (FT-IR), respectively. Electrochemical evaluations of the substrates in the presence of inhibitors were conducted using electrochemical impedance spectroscopy (EIS), open circuit potential (OCP) and potentiodynamic polarization (PP). The results revealed that cerium ammonium nitrate and calcium phosphate for HDG steel as well as ammonium phosphate dibasic for Mg ZK30, demonstrated the best corrosion inhibiting action.