To study the passivation process and chloride-induced corrosion mechanism of galvanized steel in alkali-activated fly ash (AAFA) solution, pure zinc was chosen as the working electrode. Moreover, two other simulated concrete pore solutions, e.g., saturated Ca(OH)₂ solution and ordinary Portland cement (OPC) solution were also tested for comparative purposes. Based on various electrochemical measurements and surface characterization techniques, the passivation capability and the chloride-induced corrosion behavior of zinc and its critical chloride concentration were investigated. Although no calcium hydroxyzincate (CHZ) was formed for zinc in AAFA solution due to the lack of sufficient calcium ion, a zeolite-like adsorption layer as well as a silicate gel adsorption layer could be formed on the zinc surface. Accordingly, compared with the other alkaline solutions, enhanced corrosion resistance was evident for zinc in AAFA solution even in the presence of high chloride concentration. These findings of this study serve as the first step towards enhancing our understanding of the possible application of galvanized steel in alkali-activated materials exposed to harsh marine environments.

为了研究镀锌钢在碱激活粉煤灰（AAFA）溶液中的钝化过程和氯化物诱导腐蚀机理，选择纯锌作为工作电极。此外，还测试了另外两种模拟混凝土孔隙溶液，例如饱和Ca(OH) ₂溶液和普通硅酸盐水泥(OPC)溶液以进行比较。基于各种电化学测量和表面表征技术，研究了锌的钝化能力和氯化物诱导的腐蚀行为及其临界氯化物浓度。尽管由于缺乏足够的钙离子，AAFA溶液中的锌没有形成羟基锌酸钙（CHZ），但在锌表面可以形成类沸石吸附层以及硅酸盐凝胶吸附层。因此，与其他碱性溶液相比，即使在高氯化物浓度存在下，AAFA 溶液中的锌的耐腐蚀性也明显增强。这项研究的这些发现是增强我们对镀锌钢在暴露于恶劣海洋环境的碱激活材料中的可能应用的理解的第一步。