As a promising sustainable alternative to ordinary Portland cement (OPC), there are still doubts about the protective properties of belitic calcium sulfoaluminate (BCSA) cement to the embedded steel, especially for its low pore solution alkalinity and high sulfate concentration. To guarantee the corrosion resistance of steel reinforcement in BCSA cement, using corrosion-resistant steels, such as stainless steel, is a possible choice. Yet, it is not clear how stainless steel performs in the specific pore solutions of BCSA cement. Therefore, the electrochemical behavior of AISI 304 stainless steel in BCSA cement was investigated in this study. Results show that stainless steel gains adequate passivity in BCSA cement, yet the elevated concentration of sulfate ions impairs passive films. However, the competitive adsorption of sulfate ions with chlorides in BCSA cement endows stainless steel with a higher pitting corrosion resistance as compared with OPC, confirming the superior protective ability to resist chloride attack. These findings elucidate the feasible corrosion resistance of AISI 304 stainless steel in the low-carbon BCSA cement despite its reduced inherent alkalinity and elevated sulfate concentration.

中文翻译：

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AISI 304 不锈钢在白晶硅磺基铝酸钙水泥中的耐腐蚀性

作为普通硅酸盐水泥 （OPC） 的一种有前途的可持续替代品，白铁石磺铝酸钙 （BCSA） 水泥对埋埋钢的保护性能仍然存在疑问，尤其是其低孔隙溶液碱度和高硫酸盐浓度。为了保证 BCSA 水泥中钢筋的耐腐蚀性，使用耐腐蚀钢，例如不锈钢，是一种可能的选择。然而，目前尚不清楚不锈钢在 BCSA 水泥的特定孔隙溶液中的作用。因此，本研究研究了 AISI 304 不锈钢在 BCSA 水泥中的电化学行为。结果表明，不锈钢在 BCSA 水泥中获得了足够的钝化性，但硫酸根离子浓度的升高会损害钝化膜。然而，BCSA 水泥中硫酸根离子与氯化物的竞争性吸附使不锈钢与 OPC 相比具有更高的抗点蚀性，证实了抵抗氯化物侵蚀的卓越保护能力。这些发现阐明了 AISI 304 不锈钢在低碳 BCSA 水泥中的可行耐腐蚀性，尽管其固有碱度降低且硫酸盐浓度升高。