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Chlorine-containing decontaminants, such as sodium dichloroisocyanurate (SDIC), pose a significant corrosion threat to metallic materials owing to their strong oxidizing capacity and chloride-induced pitting corrosion. However, research on corrosion inhibitors specifically designed for such systems, particularly for SDIC-based decontaminants, is critically underdeveloped. To address this gap, this study introduces a novel high-efficiency composite inhibitor system aimed at suppressing the corrosion of carbon steel, brass, and AA2024 aluminum alloy in SDIC solutions. Firstly, the synergistic mechanism underlying the inhibition of steel corrosion by two key inhibitors, namely ethylenediamine tetra(methylene phosphonic acid) sodium salt (EDTMPS) and sodium silicate, was systematically elucidated through multi-scale characterization techniques and computational simulations. Subsequently, a five-component system comprising sodium silicate, EDTMPS, sodium tungstate, 1,2,4-triazole, and zinc sulfate was optimized using static weight-loss measurements coupled with response surface methodology (RSM). This optimized system significantly reduced the corrosion rates of carbon steel, brass, and aluminum alloy from a maximum of 5.41 mm/a to below 0.01 mm/a, providing a technological foundation for corrosion protection in aggressive chemical environments.
Chen et al. (2026) studied this question.