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| A STUDY OF THE INITIATION AND PROPAGATION PROCESS OF PITTING CORROSION OF COPPER |
| Zhang Qibin and Huo Shizhong (Dalian Institute of Technology) |
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Cite this article:
Zhang Qibin and Huo Shizhong (Dalian Institute of Technology). A STUDY OF THE INITIATION AND PROPAGATION PROCESS OF PITTING CORROSION OF COPPER. J Chin Soc Corr Pro, 1989, 9(1): 36-42.
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Abstract The anodic polarization behaviour and the initiation and propagation processes of pitting corrosion of TUP copper have been studied by electro- chemical method and surface analysis technique in mixed solution of low Cl~- and SO_4~(2-) but high HCO_3~- concentrations.Copper shows typical pitting characteristics in this mixed solution.The initiation of pitting corrosion of copper is due to Cl~- ions entering surface film and migrating to metal/ film interface,resulting in local breakdown of film.The main process of pitting propagation of copper is the formation and hydrolysis of CuCl, resulting in low pH value and Cl~- enrichment with autocatalytic effect in pitting process.
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Received: 25 February 1989
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