The steel corrosion in magnesium oxychloride cement (MOC) restrains the application and popularization of MOC products. However, MOC is a green cementitious material. Therefore, it is necessary to solve the steel corrosion in MOC. Aiming at this issue, firstly, the Stern–Geary constant (B) applied to the steel corrosion in MOC was calculated and verified. Secondly, the influence of different steel and mineral admixtures on the steel corrosion in MOC was studied by electrochemical method. Thirdly, the time‐varying models of steel corrosion were given. Fourthly, the life of the steel‐MOC system was calculated based on the time‐varying model. Finally, the time‐varying characteristics of steel corrosion in MOC was proposed. The results show that B of 25 mV is suitable for the corroded steel, whereas B of 40 mV is appropriate for uncorroded steel, in MOC. In addition, the type of steel has a significant effect on steel corrosion in MOC. The anticorrosive effect of metakaolin is less than that of fly ash. The anticorrosive effect of MOC with single admixture is better than that with compound admixture. Besides, the development process of steel corrosion in MOC can be divided into three stages: the descending phase conforming to the exponential time‐varying model in the early stage, the ascending phase conforming to the logarithmic time‐varying model in the middle stage, and the descending phase conforming to the exponential time‐varying model in later stage.

中文翻译：

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氯氧化镁水泥中钢腐蚀的实验及时变特征

氯氧化镁水泥（MOC）中的钢腐蚀限制了MOC产品的应用和推广。但是，MOC是一种绿色水泥材料。因此，有必要解决MOC中的钢腐蚀问题。针对这个问题，首先，计算并验证了应用于MOC中钢腐蚀的Stern-Geary常数（B）。其次，采用电化学方法研究了不同矿物和矿物掺合料对MOC中钢腐蚀的影响。第三，给出了钢腐蚀的时变模型。第四，基于时变模型计算了钢-MOC系统的寿命。最后，提出了MOC中钢腐蚀的时变特征。结果表明，乙在MOC中，25 mV的B适用于腐蚀的钢，而40 mV的B适用于未腐蚀的钢。此外，钢的类型对MOC中的钢腐蚀有重要影响。偏高岭土的防腐作用小于粉煤灰。单掺MOC的防腐效果要好于复掺MOC的防腐效果。此外，MOC中钢腐蚀的发展过程可分为三个阶段：早期阶段符合指数时变模型的下降阶段，中期阶段符合对数时变模型的上升阶段，以及早期阶段符合对数时变模型。下降阶段在后面阶段符合指数时变模型。