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Local Electrochemical Probe for Detecting Coating Defects on Inner Wall of Metal Can in Atmosphere |
WANG Xueying1, WANG Jia1, 2, LIU Zaijian1, DING Jian1, WANG Haijie1 |
1. College of Chemistry and Chemical Engineering, Ocean University of China, Qingdao 266100, China; 2. State Key Laboratory for Corrosion and Protection, Shenyang 110016, China |
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Abstract A local electrochemical probe was designed and set up as a means for detecting coating defects on inner wall of metal can in atmosphere. This device could detect and position coating defects on inner wall in four-dimensional manner. The probe could scan the planar and cylindrical areas of the inner wall of metal can in atmosphere to reveal a map of electrochemical signals of the scanned area, thereby coating defects could be evaluated and positioned accurately. As an example, OCP and EIS of the bottom shrinkage area, weld area, bottom area and sidewalls of a metal can were detected respectively. The result showed that this device could accurately position and evaluate the status of coating defects on planar and cylindrical area for the inner wall of a metal can in atmosphere. In summary, the local electrochemical probe had high practical value in laboratory.
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Received: 01 April 2014
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