Relation between Corrosion Inhibition Efficiency of Polar Organic Compounds for Some Non-transition Metals and the HSAB Principle

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Bibliographic Information

Other Title
  • 非遷移金属に対する極性有機化合物の腐食抑制率とHSAB則の関係

Description

The hard and soft acids and bases principle (HSAB principle) is closely related to an ability of chemical adsorption of polar organic inhibitors on metallic surface. Inhibition efficiency of the organic inhibitors for various transition metals in an acid solution is thus correlated with the principle. In this study, the inhibition efficiency of polar organic inhibitors was determined on non-transition metals, Mg, Al, In, and Sn in HClO4 solutions at 30°C by polarization measurements. The inhibitors used were compounds in which elements of the polar atoms belong to the 4B, 6B, and 7B groups in the periodic table. The relationship between the efficiency and the HSAB principle was confirmed to be established for the non-transition metals, though some disorders of the relationship were observed for Mg and Al. An acid softness of the metals was estimated by using this relationship. The softness was increased in the order of Mg<Al<In<Sn. The inhibition efficiency of Si, Ge, and Sn compounds suggested the formation of adsorption bond by back-coordination of the metal electrons to an empty d-orbital of the polar atom.

Journal

  • CORROSION ENGINEERING

    CORROSION ENGINEERING 32 (3), 144-148, 1983

    Japan Society of Corrosion Engineering

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