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This paper presents findings concerning the influence of corrosion inhibitors on the corrosion resistance of galvanized steel bolts in fresh water, 1% NaCl salt water, and distilled water. The inhibitors evaluated in this study were L-tryptophan, VpCI-377, Inhibitor 1240, and Inhibitor 7961. Quantitative tests performed include gravimetric analysis and electrochemical techniques, such as linear polarization, Tafel extrapolation, and Electrochemical Impedance Spectroscopy (EIS). Electrochemical measurements determined the polarization resistance Rp, corrosion rate vcorr, and corrosion potential Ecorr. Furthermore, Scanning Electron Microscopy (SEM) and ATR-FTIR spectrometry were utilized to evaluate and characterize the formed layers on the surface of hot-dip galvanized steel samples. The potentiodynamic polarization curves show that all analysed inhibitors act as mixed type inhibitors protecting via adsorption on the metal surface. At 200 ppm, VpCI-377 showed the best protection of galvanized bolts in water.
corrosion inhibitors ; galvanized steel ; aqueous solutions ; corrosion testing
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