High-resolution characterization of the internal and external oxidation of austenitic alloys in supercritical water
High-resolution characterization of the internal and external oxidation of austenitic alloys in supercritical water
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DOI：
10.1016/j.scriptamat.2021.113814
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发表时间：
2021-05
影响因子：
6
通讯作者：
Kai Chen;Le-fu Zhang;Sheng-chuan Wu;Zhao Shen
中科院分区：
文献类型：
--
作者：
Kai Chen;Le-fu Zhang;Sheng-chuan Wu;Zhao Shen
通过高分辨率表征技术研究了两种奥氏体合金在超临界水中暴露后形成的表面氧化物结构。结果表明，19-Cr和25-Cr合金的腐蚀过程分别为内氧化和外氧化。19-Cr合金具有典型的双层厚氧化物结构，而25-Cr合金具有主要由Cr2 O3组成的较薄的保护性氧化物层。25-Cr合金中较高的Cr含量超过了一个临界值，使内氧化转化为外氧化，从而有利于形成一个薄的连续的Cr2 O3层，并保护亚表面免受进一步的氧化。
The surface oxide structures formed on two austenitic alloys after exposure in supercritical water were investigated via high-resolution characterization techniques. Results show that the corrosion processes of 19-Cr and 25-Cr alloys are internal oxidation and external oxidation, respectively. 19-Cr alloy shows a typical duplex thick oxide structure, while 25-Cr alloy has a much thinner protective oxide layer mainly composed of Cr2O3. The higher Cr content of 25-Cr alloy exceeds a critical value that enables the conversion from internal to external oxidation, thus facilitates the formation of a thin continuous Cr2O3layer and protects the sub-surface from further oxidation.