The development of portable in-situ open circuit potential test cell

Abd Latif, Muhammad Fadzilan (2017) The development of portable in-situ open circuit potential test cell. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Coating testing is very crucial to determine coating defect and to prevent corrosion as well as degradation. There are many non-destructive methods to determine coating defects such as ultrasonic testing, magnetic testing and radiographic testing. Electrochemical measurement method is a powerful method that can detect coating resistances, pinholes and scratches. However, the electrochemical measurement method is usually used in the laboratory and requires the destruction of samples. Hence, the aim of this study is to design an electrochemical probe to measure surface potential of various coating defects. A sample of carbon steel ASTM A516 is coated with glass flake epoxy paint from Jotun until 1 mm thick. The coated carbon steel surface is made into square grid of 5 × 10 with area of 1 cm2 per square. Using prototype electrode made from pencil graphite and Cu/CuSO4 (saturated) as counter and reference electrodes respectively, the surface potential of the coating defect grid is measured using open circuit potential measurement. The surface potential measurement results of each grid are then transformed into tomography image. The results are then verified with the defects and its reproducibility. The final prototype is then designed using SolidWorks software and then 3D printed using rapid prototype printer. The pilot test electrochemical probe prototype was tested to observe the workability of the electrochemical probe. The surface potential measurement can be observed through the different contour colours. From the results, the coating defect with less deep defect shows lower surface potential compare to deeper defect. . The corrosion potential of various coating defects was determined and verified. Then, the actual electrochemical probe prototype workability was tested in laboratory and it resulted that the electrochemical probe is workable.

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