INFLUENCE OF SO2-4 AND Cl- ON THE CORROSION BEHAVIOR OF COPPER TUBE IN AIR-CONDITIONING SYSTEM
来源期刊：Acta Metallurgica Sinica2004年第1期
论文作者：J.M.Wang C.N.Cao J.Q.Zhang F.H.Cao C.S.Wu Z.Zhang
Key words：copper; corrosion behavior; influence; SO2-4 ion; Cl- ion;
Abstract: The influence of chloride or sulphur dioxide on the corrosion behavior of copper tube in the air-conditioning system was studied using scanning electron microscope (SEM),energy dispersion spectrometer (EDS) and cyclic polarization techniques. The results showed that the corrosion of copper tube are mainly caused by the SO2-4- and Cl- ions in the circulating water, and the former is mainly responsible for the general corrosion of the copper tube whilst the latter for the pitting corrosion. The different influences of SO2-4- and Cl- ions on the corrosion type of copper tube may be attributed to that the radius of SO2-4- ion is much larger than that of Cl- ion. Meanwhile the results also indicated that SO2-4- inhibits the pitting corrosion caused by Cl- and Cl- inhibits the general corrosion initiated by SO2-4- due to their competitive adsorption on the copper matrix.
J.M.Wang1，C.N.Cao1，J.Q.Zhang1，F.H.Cao1，C.S.Wu1，Z.Zhang1
(1.Department of Chemistry, Yuquan Campus, Zhejiang University, Hangzhou 310027, China;
2.State Key Laboratory for Corrosion and Protection of Metals, Shenyang 110016, China)
Abstract:The influence of chloride or sulphur dioxide on the corrosion behavior of copper tube in the air-conditioning system was studied using scanning electron microscope (SEM),energy dispersion spectrometer (EDS) and cyclic polarization techniques. The results showed that the corrosion of copper tube are mainly caused by the SO2-4- and Cl- ions in the circulating water, and the former is mainly responsible for the general corrosion of the copper tube whilst the latter for the pitting corrosion. The different influences of SO2-4- and Cl- ions on the corrosion type of copper tube may be attributed to that the radius of SO2-4- ion is much larger than that of Cl- ion. Meanwhile the results also indicated that SO2-4- inhibits the pitting corrosion caused by Cl- and Cl- inhibits the general corrosion initiated by SO2-4- due to their competitive adsorption on the copper matrix.
Key words:copper; corrosion behavior; influence; SO2-4 ion; Cl- ion;
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