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It is well accepted that the electroless plating of metal is understood by the superposition of the anodic oxidation of reducing agent and the cathodic deposition of metal according to the mixed potential theory. Following to this concept, the rate of electroless plating of cobalt was estimated by the partial polarization curve method as well as the polarization resistance method. The standard composition of the electroless plating bath consisted of 0.1M CoSO4, 0.2M NaH2PO2, 0.2M Na3C6H5O7 and 0.5M H3BO3. The partial polarization curves were simulated by the polarization curves in the bath eliminating either NaH2PO2 or CoSO4 from the standard bath composition. The rate of electroless plating estimated from the partial polarization curves was remarkably less than that obtained by the weight gain measurement. The discrepancy was attributed to the fact that both the anodic and the cathodic polarization curves were strongly affected by pH and not independent each other. On the other hand, it was found that the rate was inversely proportional to the polarization resistance in good agreement with the theory of polarization resistance. Therefore, it is expected that the polarization resistance method is satisfactorily used in monitoring the rate of the electroless plating.
- 社団法人 表面技術協会の論文
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