EVALUATION OF GALVANIC CORROSION BETWEEN CARBON STEEL AND STAINLESS STEEL BARS IN CONCRETE

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  • SUZUKI Ryuhei
    Former KANAZAWA INSTITUTE OF TECHNOLOGY, Graduate Program in Civil and Environmental Engineering（3-1, Yatsukaho, Hakusan-shi, Ishikawa 924-0838, Japan）
  • HANAOKA Daishin
    KANAZAWA INSTITUTE OF TECHNOLOGY, Department of Civil and Environmental Engineering（3-1, Yatsukaho, Hakusan-shi, Ishikawa 924-0838, Japan）

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  • コンクリート中におけるステンレス鉄筋と普通鉄筋の異種金属接触腐食の評価

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<p>One of the methods for improving the durability of reinforced concrete structures is the use of stainless steel bars. However, when stainless steel bars and carbon steel bars are used in combination in a reinforced concrete structure, there is concern about galvanic corrosion of carbon steel bars. Since there are not many studies dealing with galvanic corrosion of stainless steel bars and carbon steel bars in concrete, in this study, solution experiments and concrete experiments were conducted using specimens that reproduced galvanic corrosion of dissimilar metals. The relationship between the factors affecting corrosion and the corrosion rate of reinforcing bars was evaluated. As a result, in the solution experiment, the corrosion current between dissimilar metals tended to increase due to the increase in chloride concentration and cathode area. In concrete experiments, an increase in corrosion current was observed due to an increase in cathode area, especially when carbon and stainless steel bars were in a chloride attack environment. However, when only stainless steel bars were in a chloride attack environment, the effects of galvanic corrosion of dissimilar metals were not observed. In addition, the behavior of galvanic corrosion could be expressed by calculating the corrosion current density from the polarization curve of the steel bar.</p>

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