当前位置: X-MOL 学术Mater. Corros. › 论文详情
Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)
Mechanisms of localized corrosion of carbon steel associated with magnetite/mackinawite layers in a cement grout
Materials and Corrosion ( IF 1.8 ) Pub Date : 2020-07-23 , DOI: 10.1002/maco.202011696
Mathieu Robineau 1, 2 , René Sabot 1 , Marc Jeannin 1 , Valérie Deydier 2 , Didier Crusset 2 , Philippe Refait 1
Affiliation  

Carbon steel electrodes covered with a specific low‐pH cement grout (pH ~10.7 at 20°C), designed for nuclear waste management applications, were immersed for 30 days in a 0.01‐M NaCl + 0.01‐M NaHCO3 solution (pH 7 measured at 20°C), in aerated conditions, at 80°C. The corrosion processes were studied by voltammetry and linear polarization resistance measurements while the corrosion product layers were analyzed by µ‐Raman spectroscopy and X‐ray diffraction. Most of the electrodes (75%) suffered from localized corrosion, a phenomenon associated with the formation of a heterogeneous Fe3O4/FeS layer. It is proposed that the mechanisms of the particular corrosion process observed here are associated with galvanic effects, the large magnetite‐covered zone acting as cathode and the locally mackinawite‐covered zones being anodic regions.

中文翻译:

水泥浆中碳钢与磁铁矿/马金刚石层相关的局部腐蚀机理

将专为核废料管理应用而设计的,覆盖有特定低pH水泥浆(20°C下pH〜10.7)的碳钢电极浸入0.01-M NaCl + 0.01-M NaHCO 3溶液(pH 7)中30天充气条件下,在80°C下测量)。通过伏安法和线性极化电阻测量研究了腐蚀过程,同时通过μ拉曼光谱和X射线衍射分析了腐蚀产物层。大多数电极(75%)遭受局部腐蚀,这种现象与形成异质Fe 3 O 4有关/ FeS层。建议将此处观察到的特定腐蚀过程的机理与电效应相关联,大的磁铁矿覆盖的区域充当阴极,而局部的马奇石覆盖的区域为阳极区域。
更新日期:2020-07-23
down
wechat
bug