メタノール中における軟鋼のガルバニック腐食と腐食モニターへの適用

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  • Galvanic Corrosion of Mild Steel and Application of Corrosion Monitor in Methanol
  • メタノールチュウ ニ オケル ナンコウ ノ ガルバニック フショク ト フショ

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Effects of water, chloride ion and formic acid on galvanic corrosion of mild steel coupled to noble metal in methanol have been investigated by the amount of galvanic current with zero impedance ammeter and by weight loss measurement. The corrosion rate of mild steel in methanol containing chloride ion and water was found to increase as compared to the aqueous solution containing equivalent chloride ions. The corrosion rate of mild steel in methanol containing formic acid was extremely accelerated due to the lower pH. The corrosion products consisted of C3H3FeO6·H2O and C2H2FeO4·2H2O at the concentration up to 1.5% formic acid. These products, when exposed to atmosphere, turned into a brownish amorphous substance through oxidation, which changed into Fe3O4 and Fe2O3 as the temperature increased. At the formic concentration of 1.5% or more, as the corrosion products dissolved by formic acid, the corrosion rate of mild steel showed a slight decrease. Furthermore, we proved it was possible to monitoring of the corrosion rate of steel in methanol by the galvanic current flowing from galvanic couple.

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