Study on the Corrosion Inhibition Performance of Carbonyl A in the Recirculating Water System of Indirect Air-Cooling Units

Indirect air-cooling systems dominate the domestic air-cooling models， but the huge aluminum radiators have serious corrosion problems.Considering various factors such as environmental and economic aspects， this study proposed and applied an environmentally friendly corrosion inhibitor， Carbonyl A.The corrosion inhibition performance of Carbonyl A on 1050A aluminum，304 stainless steel，and Q235 carbon steel in the circulating water system was studied through electrochemical testing， weight loss measurements， and surface morphology analysis of the metal samples.Results showed that the addition of Carbonyl A effectively inhibited the corrosion of 1050A aluminum， 304 stainless steel，and Q235 carbon steel.The corrosion inhibition mechanism was found to be the reduction of oxygen absorption corrosion on the metal surface and the formation of a protective film， which contributed to the inhibition effect.On-site operational monitoring data indicated that after the addition of the Carbonyl Aregulator， the pH value of the circulating water system was maintained below 8.5， and the concentration of Al3＋decreased from over 460 μg/L to 11～47 μg/L.Overhaul inspection results revealed that the inner surface of the 1050A aluminum heat exchanger tubes was smooth， with no rust spots or corrosion product deposits， demonstrating significant anticorrosive effects.