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気液交番環境中の鋼の腐食速度に及ぼす海水成分の影響

Effect of seawater components on corrosion rate of steel in air/solution alternating condition

大谷 恭平; 塚田 隆; 上野 文義; 加藤 千明

Otani, Kyohei; Tsukada, Takashi; Ueno, Fumiyoshi; Kato, Chiaki

本研究では、気液交番環境における炭素鋼の腐食速度に及ぼす人工海水濃度の影響を調査し、更に人工海水濃度により異なる炭素鋼の腐食機構を明らかにすることを目的とした。その結果より、純水から200倍希釈人工海水までの薄い濃度領域では濃度の増大に伴って腐食速度は加速し、20倍希釈から無希釈人工海水までの濃い濃度領域では濃度の増大に伴って腐食速度は減少することを見出した。濃度の高い人工海水中で炭素鋼の腐食が抑制された理由は、腐食による表面近傍のpH増大に伴い人工海水中のMgやCaイオンが反応界面に析出して表面を覆うことで、酸素還元反応が抑制されたためであると考えられる。

The purpose of this study was to investigate the effect of artificial sea water concentration on the corrosion rate of carbon steel under air/solution alternating condition, and to clarify the corrosion mechanism of carbon steel that changes with artificial seawater concentration. Mass measurements showed that the corrosion rate of carbon steel in the alternating condition accelerates with increasing concentration in the concentration region between deionized water to 200 times diluted artificial seawater (ASW), and the corrosion rate decreases with increasing concentration in the concentration region between 20 times diluted ASW to undiluted ASW. It can be considered that the reason why the carbon steel corrosion was suppressed in highly concentrated artificial seawater would Mg ions and Ca ions in the artificial seawater precipitate and cover on the surface due to the increase in pH near the surface by oxygen reduction reaction.

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