Abstract
The dissolution rate and dissolution morphology of an electroplated nickel film in acidic electrolyzed water (AEW) of a sodium chloride aqueous solution and in a hydrochloric acid aqueous solution of the same pH were studied. As a result, it was found that the dissolution rate of the electroplated nickel layer in the AEW was about two times higher than that in the hydrochloric acid aqueous solution of the same pH. On the surface of the electroplated nickel film immersed in the AEW, the oxide layer was removed, and microscopic pits due to local dissolution were observed. The pit has a dish-like shape with a depth of less than 0.5μm, and its surface roughness decreased when compared to the one before soaking. On the other hand, as for the one immersed in the hydrochloric acid aqueous solution, no such phenomenon was observed, and its surface roughness increased. Moreover, when the AEW was heated to 40ºC and sprayed, the dissolution of the electroplated nickel surface was promoted, the surface had a satin-like finish, and the possibility of etching was suggested.
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