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Corrosion resistance of zinc in a low-carbon binder with belitic calcium sulfoaluminate cement
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.cemconcomp.2025.105956
Wenxuan Li, Jinjie Shi
Cement and Concrete Composites ( IF 10.8 ) Pub Date : 2025-01-27 , DOI: 10.1016/j.cemconcomp.2025.105956
Wenxuan Li, Jinjie Shi
This study investigated the passivation ability and chloride-induced corrosion behavior of galvanized steel in the pore solutions of belitic calcium sulfoaluminate (BCSA) cement. Pure zinc was used to simulate the galvanized coating, and ordinary Portland cement (OPC) solution was also tested for the comparison purpose. A comparable passivation behavior was observed for pure zinc in the OPC solution and a mixture solution of 50 % OPC and 50 % BCSA cement (abbreviated as PSA solution). On the one hand, due to the high Ca2+ ion concentration and low alkalinity of the PSA solution, which is conducive to zinc passivity, a more stable protective layer of calcium hydroxyzincate (CHZ) was generated on the zinc surface. On the other hand, the passivation ability of zinc was reduced to some extent by the high SO42− ion concentration in the PSA solution. During the corrosion stage induced by exogenous chlorides, a different variation tendency was found for the corrosion resistance of zinc in OPC and PSA solutions over exposure time. Owing to the synergetic attack by SO42− and Cl− ions, the critical chloride concentration of zinc in the PSA solution was only 0.3 M, as determined by a sharp drop of Ecorr and Rp values, while zinc in the OPC solution exhibited a much higher chloride resistance with the critical chloride concentration of 0.8 M. However, this detrimental effect on the corrosion resistance of zinc in the PSA solution was less pronounced with prolonged exposure due to the formation of protective corrosion products.
中文翻译:
锌在含白铁矿硫酸铝酸钙水泥的低碳粘合剂中的耐腐蚀性
本研究研究了镀锌钢在白铝酸钙 (BCSA) 水泥孔隙溶液中的钝化能力和氯化物诱导腐蚀行为。纯锌用于模拟镀锌涂层,并且还测试了普通的波特兰水泥 (OPC) 溶液以进行比较。在 OPC 溶液和 50% OPC 和 50% BCSA 水泥的混合溶液(缩写为 PSA 溶液)中观察到纯锌的钝化行为相似。一方面,由于 PSA 溶液的 Ca2+ 离子浓度高,碱度低,有利于锌的钝化,因此在锌表面产生了更稳定的羟基锌酸钙 (CHZ) 保护层。另一方面,PSA 溶液中的高 SO42− 离子浓度在一定程度上降低了锌的钝化能力。在外源性氯化物诱导的腐蚀阶段,发现锌在 OPC 和 PSA 溶液中的耐腐蚀性随暴露时间的变化趋势不同。由于 SO42- 和 Cl--离子的协同攻击,PSA 溶液中锌的临界氯化物浓度仅为 0.3 M,由 Ecorr 和 Rp 值的急剧下降确定,而 OPC 溶液中的锌表现出更高的耐氯化物性,临界氯化物浓度为 0.8 M。然而,由于形成保护性腐蚀产物,长时间暴露对锌在 PSA 溶液中的耐腐蚀性的不利影响不太明显。
更新日期:2025-01-28
中文翻译:
锌在含白铁矿硫酸铝酸钙水泥的低碳粘合剂中的耐腐蚀性
本研究研究了镀锌钢在白铝酸钙 (BCSA) 水泥孔隙溶液中的钝化能力和氯化物诱导腐蚀行为。纯锌用于模拟镀锌涂层,并且还测试了普通的波特兰水泥 (OPC) 溶液以进行比较。在 OPC 溶液和 50% OPC 和 50% BCSA 水泥的混合溶液(缩写为 PSA 溶液)中观察到纯锌的钝化行为相似。一方面,由于 PSA 溶液的 Ca2+ 离子浓度高,碱度低,有利于锌的钝化,因此在锌表面产生了更稳定的羟基锌酸钙 (CHZ) 保护层。另一方面,PSA 溶液中的高 SO42− 离子浓度在一定程度上降低了锌的钝化能力。在外源性氯化物诱导的腐蚀阶段,发现锌在 OPC 和 PSA 溶液中的耐腐蚀性随暴露时间的变化趋势不同。由于 SO42- 和 Cl--离子的协同攻击,PSA 溶液中锌的临界氯化物浓度仅为 0.3 M,由 Ecorr 和 Rp 值的急剧下降确定,而 OPC 溶液中的锌表现出更高的耐氯化物性,临界氯化物浓度为 0.8 M。然而,由于形成保护性腐蚀产物,长时间暴露对锌在 PSA 溶液中的耐腐蚀性的不利影响不太明显。