Investigating effective parameters in the performance of the balls covering the surface of the plating bath in the emission of chromium vapors

Abstract

The purpose of using electroplating is the high cost of corrosion of metal equipment. However, the dangers of this process are the basis for using industrial hygiene control methods in this industry. The aim of this study is to Investigating the effective parameters in the performance of the balls covering the surface of the plating bath on the amount of vapors that released. This study was done in chrome plating. The balls covering the bath surface and the parts to be plated which were the balls in gas ball valves used in this study have two different outer diameters, the number of layer covered by plastic balls, and other parameters such as the temperature of the bath, the concentration of the solution inside the bath and the humidity and temperature of the environment. In this study, each stage of the research includes 4 samples and a total of 80 air samples were collected based on 7300 NIOSH analytical methods. Based on the results, mean +/- standard deviation of pollution concentrations without and with balls were 41.66 +/- 59.99 mg/m(3) and 26.67 +/- 53.07 mg/m(3). The results showed that the use of balls covering the surface of the plating bath could significantly reduce the pollution concentration (P = 0.004). However, parameters of balls in gas ball valves, number of ball layers, and number of plastic balls could not affect the pollutant emission with balls (P > 0.074). Therefore, it can be stated that the plastic balls covering the surface of the electroplating bath are an effective way to reduce the amount of pollutants emitted from the surface of the electroplating bath.