Conductivity method as a new monitoring technique for corrosion and corrosion inhibition processes of zinc metal

Abstract

Conductivity method was successfully examined to monitor the corrosion and corrosion inhibition processes. Measurements of electrical conductivity of three different corrosive solutions (HCl, NaOH, and NaCl) with two different concentrations containing zinc sheets in absence and presence of four different concentrations of sodium lignosulfonate (1.0, 5.0, 10.0, and 20.0 mM) were performed at 20 oC. The analysis of curves that illustrate the changes of conductivity of these solutions provides qualitative information about the strength of corrosion as well as the extent of corrosion inhibition behavior. The effect of sodium lignosulfonate as a corrosion inhibitor was very obvious in acidic medium (For both 0.10 and 1.0 M HCl) and less visible in other two media.