Corrosion Inhibition of 1,2,4-triazaole on Copper in a Stimulated Cooling Water for Synchronous Condenser
The effect of a corrosion inhibitor 1,2,4-Triazole(TAZ)on the water quality of a simulated solution of the rotor cooling water and the corrosion inhibition performance for pure Cu-plate were as-sessed by means of pH meter,conductivity meter and dissolved oxygen analyzer,as well as measure-ments such as mass loss,dynamic potentiodynamic polarization curve,and electrochemical impedance spectroscopy.The results show that the addition of TAZ can reduce the pH value to a certain extent,but have little effect on the conductivity and dissolved oxygen content of the solution;With the increase of TAZ concentration,the corrosion rate and the corrosion current density for Cu decrease,i.e.,its corrosion inhibition efficiency rises.The highest corrosion inhibition efficiency was 99.9％(loss-in-mass method)and 92.0％(EIS method)when the dose of TAZ was 10 mmol/L.The adsorption process on the metal sur-face was fitted using Langmuir isotherm,which confirmed that the adsorption of TAZ on the copper sur-face is a mixed adsorption.The theoretical calculations further proved that TAZ has a better adsorption ef-fect on the surface of Cu,which can effectively inhibit the Cu corrosion in the simulated solution.It is ex-pected that TAZ may have better corrosion inhibition performance for Cu in the rotor cooling waters,which is a kind of green corrosion inhibitor in spontaneous adsorption.Thus,the present results may be a meaningful reference for the application of corrosion inhibitor to protect the hollow-core copper conduc-tors in the rotor cooling water for synchronous condenser.
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