CORROSION POTENTIAL IMAGING AT INTERFACE OF POLYMERIC COATING/METAL BY ARRAY ELECTRODETECHNIQUE

J Chin Soc Corr Pro

1997, Vol. 17

Issue (1): 7-11 DOI:

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CORROSION POTENTIAL IMAGING AT INTERFACE OF POLYMERIC COATING/METAL BY ARRAY ELECTRODETECHNIQUE

LIN Changjing ZHUO Xiangdong CHEN Jidong WANG Hui(Stote Key Laboratory of Physical Chemistry for the Solid Surface; Department of Chemistry; XiamenUniversity; China)

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Abstract An array electrode composed of 64 steel wires and a potential imaging system were developed as a new electrochemical technique for probing the corrosion potential distribution at interface of polymeric coating/metal. The measuring technique was described, and the availability of the technique was examined. The novel data related to the corrosion behavior at the interface were obtained and the effects of defects in the coating on its degradation were discussed. The potential imaging demonstrated the existence of inhomogeneities in the coatings, including intrinsic defects or damage in service (artificial defects). Corrosion preferentially initiated at the defect sites. The anodic sites surrounding cathodic area and the development process of corrosion reaction were in situ imaged for the first time for organically coated steel system. The relevant and direct information provided by this unique technique would be very helpful for further understanding some important physicochemical processes associated with degradation of coated metals.

Key words: Corrosion potential imaging Polymer/metal interface Array electrode technique Corrosion mechanism

Received: 25 February 1997

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LIN Changjing ZHUO Xiangdong CHEN Jidong WANG Hui(Stote Key Laboratory of Physical Chemistry for the Solid Surface; Department of Chemistry; XiamenUniversity; China). CORROSION POTENTIAL IMAGING AT INTERFACE OF POLYMERIC COATING/METAL BY ARRAY ELECTRODETECHNIQUE. J Chin Soc Corr Pro, 1997, 17(1): 7-11.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I1/7

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