Mechanical Plating of Metals by Zinc Powder Ejection Method
Katsushige Uematsu and Kunio Funami
Abstract:This paper is to study the particle ejecting conditions on the plating efficiency of the mechanical plating of steel by using hard zinc ejecting particles which have iron nuclei. In order to increase the plating rate, effects of mechanical properties of the ejecting powders and plated test specimens and of the ejecting conditions of particles on the adhering quantity of zinc were investigated. As a result, it became obvious that an increment of the ejecting speed of powders and the hardness of plating specimen had significant effect on the adhering quantity of zinc in comparison with particle size. For the size of particle which contains few iron nuclei , the optimum particle size was found to be 0.1`0.2 mm in diameter. On the contrary, it was observed that for larger size of the particle, the adhering quantity of zinc was insufficient because of an increment of the peeling off rate of layers. The adhering quantity changed greatly also with an oxidized layer of particle surface in comparison with that of the plating specimen surface. Adhering strength of this zinc layer by the present ejection method was almost same as those prepared by other zinc plating methods Key Words:Zinc powder ejection, Mechanical plating, Powder ejection speed, Adhering quantity