Magnesium alloys are considered for building materials in this study due to their natural immunity to corrosion in alkaline concrete pore solution. But, chloride ions attack often hinders the application of most metals. Therefore, it is necessary to conduct a preliminary corrosion evaluation and attempt to find an effective way to resist the attack of chloride ions in concrete pore solution. In our study, hydrothermal treatment is carried out to modify Mg-9.3 wt. % Al alloy. After the treatment in NaOH solution for 10 h, scanning electron microscopy (SEM) reveals that a layer of dense coating with a thickness of about 5 μm is formed on Mg alloy. Energy dispersive X-ray spectroscopy (EDS), X-ray photoelectron spectroscopy (XPS), and X-ray Diffraction (XRD) are combined to analyze the coating, and it is thereby confirmed that the coating is mainly composed of Mg(OH)2. As expected, both immersion test and electrochemical corrosion test show that the coated magnesium alloy has a better corrosion resistance than the uncoated one in simulated concrete pore solution with and without chloride ions. In summary, it indicates that hydrothermal treatment is a feasible method to improve the corrosion resistance of Mg alloys used for building engineering from the perspective of corrosion science.

中文翻译：

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水热处理提高镁合金在模拟混凝土孔隙溶液中的耐腐蚀性能


在这项研究中，镁合金被认为是建筑材料，因为它们在碱性混凝土孔隙溶液中具有天然的抗腐蚀能力。但是，氯离子的侵蚀常常阻碍大多数金属的应用。因此，有必要进行初步的腐蚀评估，尝试寻找抵抗混凝土孔隙溶液中氯离子侵蚀的有效方法。在我们的研究中，通过水热处理来改性 Mg-9.3 wt。 ％铝合金。在NaOH溶液中处理10 h后，扫描电镜（SEM）显示镁合金上形成了一层厚度约为5 μm的致密镀层。结合能量色散X射线能谱(EDS)、X射线光电子能谱(XPS)和X射线衍射(XRD)对涂层进行分析，从而证实涂层主要由Mg(OH)2组成2.正如预期的那样，浸泡试验和电化学腐蚀试验均表明，在含有和不含氯离子的模拟混凝土孔隙溶液中，涂层镁合金比未涂层镁合金具有更好的耐腐蚀性。综上所述，从腐蚀科学的角度表明，水热处理是提高建筑工程用镁合金耐腐蚀性能的一种可行方法。