Application of cathodic protection method on steel structures using sacrificial anode and sodium polyacrylate-sodium carboxymethyl cellulose (PANa–CMC) hydrogel electrolyte AITranslate

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DOI：https://doi.org/10.1016/j.cscm.2023.e02742

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Highlights • PANa–CMC hydrogel is developed for the SACP method in high-humidity environments. • The incorporation of CMC in the hydrogel improves its water retention capacity. • Optimal adhesive strength between hydrogels and steel is attained at a CMC ratio of 5%. • The presence of CMC in hydrogels enhances their electrochemical performance. • Hydrogels with anodes offer protective currents to mitigate corrosion in steel. An ionically conductive sodium polyacrylate-sodium carboxymethyl cellulose (PANa–CMC) hydrogel electrolyte was developed for the sacrificial anode cathodic protection (SACP) of carbon steel in high-humidity environments. The incorporation of varying ratios of CMC into hydrogel formulation enhanced the water retention capacity, adhesion strength, and electrochemical performance, making it suitable for SACP applications. Particularly, PANa-5% CMC hydrogels demonstrated a current density of approximately 3 μA/cm², inhibited passive corrosion product formation, and sequestered metal ions from anodes, thus minimizing contamination. These findings highlight the substantial potential of PANa–CMC hydrogels as electrolytes, expanding the application of the SACP method to atmospheric environments. Graphical Download : Download high-res image (240KB) Download : Download full-size image