Diagnosis of Water Quality for Carbon Steel Corrosion by Mahalanobis-Taguchi Method

Abstract

Corrosion diagnostics of carbon steel in fresh water were carried out by Mahalanobis-Taguchi Method. Concentrations of sulfate ion, chloride ion and bicarbonate ion were used as items to judge the corrosion index. Artificial base areas were constructed by deciding standard deviations and the correlation coefficients arbitrarily. The items were classified into corrosion accelerator and corrosion inhibitor. “Closed” base area was constructed by using the axis of reciprocal concentration of corrosion inhibitor. The new method to construct on optimal base area artificially was developed. As the results to apply the present method to the experimental results of carbon steel in fresh water, the erroneous decision decreases remarkably comparing the conventional Mahalanobis-Taguchi Method.