Investigation of the Processing Parameters on the Chemical Cleaning of Fouling Lead Layer from Chromium Surfaces by Using an Orthogonal Array Design Method

In this research, an orthogonal array design (OAD), OA9 was exploited as a chemometric experimental method for the cleaning of chromium surfaces contamination by using an electrochemical cleaner solution that is established upon the redox reaction principle. The influence of cleaning procedure on the removal of lead fouling layer has been investigated by means of SEM/EDAX and ICP analysis. In order to estimate of the main effect of some experimental parameters, we examined the procedure with a statistical method and the results were quantitavely evaluated by the analysis of variance (ANOVA). The OAD estimation of experimental result provides optimized amount of the parameters including, H O 10% (V/V), stirring speed of the mixture 75 rpm 2 2 and temperature 28°C, to achieve the most cleaned sample, at which the total removal time of 3 g fouling lead layer is predicted only 7 minutes. The prediction has a complete conformity with experimental result achieve at the similar condition that is 8 minutes. Also, the reaction rate constant of the lead bar oxidation at optimum condition was obtained from the ICP spectroscopy data that proposed by Ostwald approximation method. Finally, the results of this study illustrated that the efficiency of the proposed chemometric cleaning method is higher than that our partner sequential experimental technique.