Role of mill scale on corrosion behavior of steel rebars in mortar
Role of mill scale on corrosion behavior of steel rebars in mortar
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DOI：
10.1016/j.corsci.2020.108995
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发表时间：
2020-12-01
影响因子：
8.3
通讯作者：
Akiyama, Eiji
中科院分区：
文献类型：
--
作者：
Doi, Kotaro;Hiromoto, Sachiko;Akiyama, Eiji
采用高压氧加速腐蚀试验（HOACT）和极化曲线测试方法研究了氧化铁皮对砂浆中钢筋腐蚀行为的影响。当砂浆和饱和Ca（OH）2溶液中含有氯离子时，氧化皮缺陷会恶化钢筋的钝化性。氧化铁皮下的局部腐蚀是加速脱钝化的主要原因。SEM观察和拉曼光谱测量表明，铁氧化皮下最初形成的Fe 3 O 4层和进一步的腐蚀导致铁离子通过缺陷迁移，并在氧化皮上形成主要由α-和γ-FeOOH组成的锈层。
The role of mill scale on the corrosion behavior of steel rebars in mortar was studied using Hyperbaric-Oxygen Accelerated Corrosion Tests (HOACT) and polarization measurements. Defects of mill scale deteriorated passivity of rebars when mortar and saturated Ca(OH)(2) solution contained chloride. Localized corrosion beneath mill scale with defects was responsible for the acceleration of depassivation. SEM observations and Raman spectroscopy measurements revealed that a Fe3O4 layer initially formed under the mill scale and further corrosion resulted in migration of Fe ions through the defects and formation of a rust layer mainly composed of alpha- and gamma-FeOOH on the mill scale.