Hydroxypropyl methyl cellulose acetate succinate (HPMCAS) is an extension of the biopolymer hydroxypropyl methylcellulose and is a biodegradable and environmentally friendly material. In this study, the electrochemical properties of HPMCAS coatings in acidic solution environments were studied. The electrochemical properties were analyzed by potentiodynamic polarization measurements and electrochemical impedance spectroscopy, which were performed for different pH levels and immersion periods. It was observed that the coating thickness increases owing to a swelling effect, resulting in an increase in the corrosion resistance. Based on the change in the coating thickness, the coating moisture content, and the results of Raman spectroscopy, the mechanism responsible for the corrosion resistance of HPMCAS was discussed. The results of this study highlight the potential of biopolymers as a dry anticorrosive coating material.
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