Evaluation of Degradation Behavior of Protective Coatings by Scanning Acoustic Microscopy
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概要
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The degradation behavior of a red pigmented long-alkyd resin paint (LAR) film on steel was investigated by scanning acoustic microscopy (SAM). Acoustic micrographs of coating film/steel interface essentially detected the development of degradation of the coating film after immersion in a 3% sodium chloride (NaCI) aqueous solution. The percentage of disbonded area of the coating film on steel was also determined. An increasing growth of disbonded area which initially appeared as blisters on the coating film was observed with the passage of time immersed in the NaCI solution. A good correlation between the percentage of disbonded area by the SAM and the coating film resistance (R<SUB>f</SUB>) value by the electrochemical impedance spectroscopy (EIS) was obtained. The extent of disbonding of the LAR coating film on steel increased while the R<SUB>f</SUB> value gradually decreased with increasing immersion time. Based on the results, the SAM was found to be essentially useful for the evaluation and monitoring of the degradation behavior of protective coating films on steel.
- Japan Society of Colour Materialの論文