Abstract 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 α- and γ-FeOOH on the mill scale.

中文翻译：

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氧化皮对钢筋在砂浆中腐蚀行为的影响

摘要 使用高压氧加速腐蚀试验 (HOACT) 和极化测量研究了氧化皮对钢筋在砂浆中腐蚀行为的作用。当砂浆和饱和 Ca(OH)2 溶液中含有氯化物时，氧化皮缺陷会降低钢筋的钝化性。带有缺陷的氧化皮下的局部腐蚀是加速去钝化的原因。SEM 观察和拉曼光谱测量表明，最初在氧化皮下形成 Fe3O4 层，进一步腐蚀导致 Fe 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。