Estimation of Current, Equilibrium and Protective Concentration of Volatile Corrosion Inhibitors in the Phase Surface Moisture Film
A method of electrochemical estimation of current, equilibrium and protective concentrations of volatile corrosion inhibitors (VCI) absorbed by a phase moisture film formed on the surface of corroding metal is proposed. Procedure: the outer airtight vessels with a given relative air humidity (H) are saturated with VCI vapour absorbed by the distilled water or salt solution. Data ofelectrochemical measurements in NaCl solutions and standard media containing VCI and NaCl are then used in plotting polarization curves for metal specimens under study. Comparison of the polarization curves in the obtained and standard solutions in combination with the data on the metal corrosion rate provides determination of the aforementioned VCI concentrations.