Abstract
Unicharged anions of weak organic acids in sulfate solutions of pH 3–6 are shown to inhibit the dissolution of liquid and solid gallium in active and passive states. Dicharged anions make the dissolution of passive solid gallium rapidly accelerate and have virtually no effect on the dissolution of passive liquid gallium. Unicharged anions facilitate the oxygen atom formation on inactive surface sites. The gallium electroreflection measurements show that, regardless of the charge, weak-acid anions suppress variations in the free charge of gallium and “passivate” active dissolution without participation of oxygen.
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