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>Characterization of initial atmospheric corrosion of conventional weathering steels and a mild steel in a tropical atmosphere
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Characterization of initial atmospheric corrosion of conventional weathering steels and a mild steel in a tropical atmosphere
The phases and compositions of the corrosion products of a mild steel (A-36) and two weathering steels (A-588 and COR 420) formed after 3 months exposure to the tropical marine atmosphere of Panama were examined using FTIR and Mössbauer spectroscopy. The results show that amorphous or crystallized iron oxyhydroxides goethite α-FeOOH and lepidocrocite γ-FeOOH are early corrosion products. Maghemite γ-Fe2O3 and magnetite Fe3O4 have also been identified and found to be prominent components for steels exposed to the most aggressive conditions. The formation of akaganeite β-FeOOH was observed when chlorides were occluded within the rust. FTIR showed the presence of hematite α-Fe2O3 in one sample.
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机译:使用FTIR和Mössbauer光谱仪检查了暴露在巴拿马热带海洋大气中3个月后形成的低碳钢(A-36)和两种耐候钢(A-588和COR 420)的腐蚀产物的相和组成。结果表明,无定形或结晶的羟基氧化铁针铁矿α-FeOOH和纤铁矿γ-FeOOH是早期腐蚀产物。磁铁矿γ-Fe 2 sub> O 3 sub>和磁铁矿Fe 3 sub> O 4 sub>也被鉴定出来,并且很显着。暴露在最恶劣条件下的钢部件。当铁锈中夹杂有氯化物时,观察到赤铁矿β-FeOOH的形成。傅立叶变换红外光谱显示在一个样品中存在赤铁矿α-Fe 2 sub> O 3 sub>。
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