Local Electrochemical Probe for Detecting Coating Defects on Inner Wall of Metal Can in Atmosphere

doi:10.11902/1005.4537.2014.039

Journal of Chinese Society for Corrosion and protection

2015, Vol. 35

Issue (2): 169-176 DOI: 10.11902/1005.4537.2014.039

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Local Electrochemical Probe for Detecting Coating Defects on Inner Wall of Metal Can in Atmosphere

WANG Xueying¹, WANG Jia^{1, 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.

Key words: local electrochemical probe metal can coating defect open circuit potential electrochemical impedance spectroscopy

Received: 01 April 2014

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WANG Xueying, WANG Jia, LIU Zaijian, DING Jian, WANG Haijie. Local Electrochemical Probe for Detecting Coating Defects on Inner Wall of Metal Can in Atmosphere. Journal of Chinese Society for Corrosion and protection, 2015, 35(2): 169-176.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.039 OR https://www.jcscp.org/EN/Y2015/V35/I2/169

Structure of local electrochemical probe for sidewalls and weld area testing (a) and bottom
shrinking area and bottom area testing (b)

Structure diagram of XYZθ

four-dimensional scanning moving platform

Electrochemical impedance spectroscopy of sample cans in 5%NaCl solution: (a) Bode plots, (b) phase angle

Changes of open circuit potential of the coating at bottom shrinkage area with extension of time (a) and position (b)

Bode plots (a) and impedancemodulus values (b) of the coating at bottom shrinkage area at different positions

Corrosion topography of defect point at bottom shrinkage area

Changes of open circuit potential of the coating at weld zone with extension of position

Impedance modulus values of the coating at weld zone at different positions

Corrosion topography of defect point at weld zone

Changes of open circuit potential of the coating at bottom area at different positions: (a) cylindrical scanning, (b) radial scanning

Impedance modulus values of the coating at bottom area at different positions: (a) cylindrical scanning, (b) radial scanning

Corrosion topography of defect point at
bottom area

Changes of open circuit potential (a) and impedance modulus values (b) of the coating at sidewalls area at different positions

Corrosion topographies of defect points A (a) and B (b) at sidewalls area

Electrochemical impedance spectroscopies of coating defects of different sizes: (a) Nyquist plot, (b, c) Bode plot

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