Dissolution of zinc shot in electrogalvanizing solutions*

CIM Bulletin, Vol. 84, No. 951, 1991

P.L. Claessens, C. Bowen and S. Belisle, Noranda Technology Centre, Pointe Claire, Quebec

Use of zinc shot feed is a well-established procedure among North American electrogalvanizers. This form of zinc is easy to handle and relatively inexpensive when compared with zinc oxide. This paper reports results on the kinetics of zinc shot dissolution in traditional pure zinc solutions and in electrolytes used for the plating of nickel/zinc alloys. Despite the cementation of minor amounts of nickel in the latter solution, acceptable dissolution rates of the zinc shot can be achieved through proper adjustment of the solution velocity. Under these conditions, the nickel shell produced by cementation is continuously abraded, exposing the underlying zinc.
Keywords: Metallurgy, Electrogalvanization, Coatings, Zinc shot, Plating.