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ABSTRACT
The study investigates the effects of inorganic coating on the corrosion of susceptibility of mild steel in a chloride environment. In this study, mild steel samples were treated with zinc inorganic coatings through a dipping process. Both coated and uncoated samples were subsequently immersed in a 1M sodium chloride solution, mimicking the corrosive action encountered in marine environments. The comparative analysis of corrosion resistance was meticulously conducted using electrochemical impedance spectroscopy techniques, complemented by visual inspections and precise weight loss measurements. The corrosion behavior of coated and uncoated mild steel in a chloride environment was evaluated over 20 days, with corrosion rates analyzed at 5-day intervals. The coated specimen demonstrated high initial resistance to corrosion, with a low corrosion rate of 0.0116 mm/yr and efficiency of 95.10% on day 1-5. However, the corrosion rate of the coated specimen increased progressively to 0.1927 mm/yr by day 16-20, while the coating efficiency declined to 45.67%, indicating a degradation of the coating over time. In contrast, the uncoated specimen experienced significantly higher corrosion rates throughout, peaking at 0.5132 mm/yr on day 11-15 due to the aggressive chloride environment. These results highlight the short-term effectiveness of the inorganic coating and its limitations in maintaining long-term protective performance, emphasizing the need for improved durability in chloride-rich environments.
