The relative potentials of the zinc-zinc ion, chromous-chromic ion systems might lead one to expect smooth progress of the reaction Zn + 2Cr +++ ~ Zn + § + 2Cr ++. However, various other reactions are possible, and the dissolution or corrosion process is complicated; it is electrochemical in nature, and, in some solutions, rapid enough to permit transport control of the rates. The dissolution rate is highly dependent on the form of chromic ion present, on pretreatment of the metal surface, in some solutions on the acidity, and, under some conditions, the main reaction is hydrogen evolution with little reduction of chromic ion.
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