Sistema de agitação em cobre alcalino na galvanização de zamak

Abstract

This work aims to reduce the percentage of parts that do not visually conform to the criteria required by quality, through the design, analysis and selection of an efficient and low-cost agitation system, for implementation in an alkaline copper tank in the chrome plating process. of zamak in an automatic electroplating line installed in the company PADO SA. After a five-month survey carried out in the inspection process, after electroplating on the main defects, a large number of losses of zamak parts were found due to non-compliance in visual aspects, so there is an extreme need for actions to solve the problem. Taking into account the properties of the zamak alloy, despite having several advantages such as ease of processing mainly for electroplating and painting finishes, low melting temperature and low cost, after the casting stage it presents great porosity on its surface, a result of the structure hexagonal shape formed after cooling. Thus, three possible agitation systems were raised after analysis, it was verified based on the literature and on the cost, greater feasibility for implementing an agitation system using eductors, hoping to reduce the degradation of cyanide by carbonation, improve efficiency in uniformity of alkaline copper deposit on the porous surface of the zamak and thus reduce losses mainly from defects such as porosity, drizzle, roughness and stains.