Mass loss for assessment of the inhibitory efficiency of products to basis of phosphate

Abstract

The effect of variation of the corrosion levels has been studied experimentally by mass loss that proves to be a first approach in the study of the inhibition of corrosion of a metal in an electrolytic solution in order to determine the inhibitory efficiency of the product tested. Two inhibitors to basis of phosphate and that didn't show effects of toxicity in the literature have been used: the sodium phosphate and the potassium monohydrogenophosphate. Tests have been led in three different environs, the first one simulates the marine environment of the Mediterranean (3% NaCl), the second environ represents a solution of calcium hydroxide saturated Ca(OH)2 simulates the solution of the pores of the concrete and the third one represents the synthetic environment of the concrete in the same conditions of temperature and relative humidity. Maximal value of the inhibitory efficiency has been treasured respectively formerly to 80%, 75% and 74% for the sodium phosphate in the three surroundings; while for the potassium monohydrogenophosphate, this efficiency has been evaluated at 65,5%, 66% and 51,5% in the same three surroundings of the study. The influence of the concentration as well as the effect of the PH have been interpreted.