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Zairyo-to-Kankyo
Vol. 58 (2009), No. 10

Zairyo-to-Kankyo Vol. 58 (2009), No. 10

Japan Society of Corrosion Engineering as an Information HUB

Kazuhisa Azumi

pp. 345-345

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Japan Society of Corrosion Engineering as an Information HUB

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DOI:10.3323/jcorr.58.345
Reaction of Cr and Cr Oxide with NaCl at Elevated Temperature

Nobuhiko Hiraide, Tatsuhisa Muneno, Haruhiko Kajimura

pp. 348-355

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Reaction of Cr and Cr Oxide with NaCl at Elevated Temperature

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DOI:10.3323/jcorr.58.348

Abstract

Reaction of Cr and Cr₂O₃ with NaCl were investigated in air at 673-973 K. In the presence of NaCl, mass gain of Cr was remarkably accelerated. Na₂CrO₄ and Cl₂ were produced during heating Cr₂O₃ with NaCl. Na₂CrO₄, Cl₂, CrCl₂, CrCl₃, and Cr₂O₃ were produced when Cr was heated with NaCl. Na₂CrO₄ and Cl₂ were produced by the reaction of Cr with NaCl and O₂. CrCl₂ and CrCl₃ were produced by the reaction of Cr with Cl₂. Na₂CrO₄, CrCl₂ and CrCl₃ accelerated the oxidation of Cr.
A Study of Potential Methods for Controlling Macro-cell Corrosion of Buried Steel Pipes in Concrete/Soil Systems by the Addition of Uric Acid as a Concrete Admixtures.

Norio Nakayama, Shukuji Asakura

pp. 356-362

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A Study of Potential Methods for Controlling Macro-cell Corrosion of Buried Steel Pipes in Concrete/Soil Systems by the Addition of Uric Acid as a Concrete Admixtures.

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DOI:10.3323/jcorr.58.356

Abstract

Severe localized corrosion of steel pipes, buried in concrete/soil systems (known as macro-cell corrosion), is induced by cathodic reactions on those steel surfaces that are located in the concrete, accompanied by anodic reactions (i.e., corrosion) on those surfaces that are located in the soil. The addition of cathodic inhibitors to the concrete, in the form of cement admixtures, is therefore expected to be an effective means of suppressing this phenomenon. Concrete test specimens (ordinary Portland cement; water/cement ratio: 61%), containing uric acid as the inhibitor have been formulated and the inhibitory effect of uric acid on the macro-cell corrosion has been examined by the measurement, over 862 days, of the currents flowing between the steel (SGP) pipes embedded in the concrete test specimens and those buried in soil. Dry mixing of 10% uric acid by weight was shown to decrease the currents, which indicates that macro-cell corrosion can be effectively controlled by uric acid. Addition of 0.3 or 3% uric acid was ineffective. This tendency was also supported by the results of weight-loss measurements of steel pipes buried in soil. The inhibitory effect becomes more predominant as the measurement time increases (inhibition efficiencies: 64% for 0-862 days, 78-91% for 297-862 days).

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Zairyo-to-Kankyo Vol. 58 (2009), No. 10

Japan Society of Corrosion Engineering as an Information HUB

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Reaction of Cr and Cr Oxide with NaCl at Elevated Temperature

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A Study of Potential Methods for Controlling Macro-cell Corrosion of Buried Steel Pipes in Concrete/Soil Systems by the Addition of Uric Acid as a Concrete Admixtures.

Share it with SNS

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