Inhibitive Effect of Aluminium-Ligand System for Corrosion of Iron in Neutral Water

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  • 中性水中の鉄腐食に対するアルミニウム-錯化剤系インヒビターの抑制効果
  • チュウセイ スイチュウ ノ テツ フショク ニ タイスル アルミニウム サクカ

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Abstract

In our previous works, aluminium ion was found to serve as effective inhibitor for iron corrosion in water. However, the ion is partly hydrolyzed to form AlOH2+ ion, which cause the solution slightly acidic (pH=4.3). It follows that neutralization is inevitable for discharge. In order to overcome this defect, aluminium-ligand system was examined. Among many ligands investigated, oxalate and malonate were found to be suitable. Since these salts prevented the hydrolysis of aluminium ion as a result of the complex formation, the solution became neutral. Furthermore, the inhibitive effect was considerably enhanced as high as 97%. The mechanisms of these behaviour were also discussed based on the thermodynamic consideration.

Journal

  • CORROSION ENGINEERING

    CORROSION ENGINEERING 39 (9), 461-466, 1990

    Japan Society of Corrosion Engineering

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