Abstract
Electroless silver plating using the oxidation reaction of Co (II) was investigated. Co (II) complexes with ammonia of amines were found to be an effective reducing agent for deposition. Plating reaction was promoted autocatalytically without hydrogen evolution. Deposited silver films displayed excellent optical reflection properties like those of vacuum silver deposits. However, the deposition rate gradually decreased with the reaction time since Co (II)-amine complex ions are readily self oxidized in an air atmosphere and bath life diminished. Bath life can be prolonged with the prevention of Co (II) oxidation in a nitrogen atmosphere.
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