Corrosion: Structural Characterization of Products

Waseda, Yoshio; Suzuki, Shigeru

doi:10.1081/e-eisa-120053016

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2023

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“…[ 18–20 ] The protective nature of the Ca‐specimen demonstrated in Figure 2 cannot be explained by the fact that the main component is β‐FeOOH, as this iron oxyhydroxide is known to lack anticorrosion properties. [ 21–23 ] Thus, the protective nature of the innermost rust layer is due to the presence of CaCO 3 , as indicated by the diffraction peak of the innermost rust layer shown in Figure 7. The presence of CaCO 3 only in the innermost rust layer can be interpreted as follows.…”

Section: Discussionmentioning

confidence: 99%

Corrosion behavior of carbon steel covered with a coating film containing metallic compounds under a sulfuric acid mist environment containing chloride

Takahashi,

Deguchi,

Hayashi

et al. 2023

Materials & Corrosion

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The corrosion behavior of carbon steel covered with coating films containing Al2(SO4)3, CaO, and BaO was examined under a sulfuric acid mist environment containing chloride. CaSO4･2H2O and BaSO4 were formed as the corrosion products in the coating film and prevented the penetration of corrosives, in particular BaSO4 was highly effective. Furthermore, the rust layer containing CaCO3 adhered to the carbon steel substrate suppressed the penetration of chloride. The formation of these corrosion products suppressed the anodic reaction, resulting in higher corrosion resistance of the carbon steel in the chloride‐containing acid environment.

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Section: Discussionmentioning

confidence: 99%