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The New Concept of Failure of Thin Organic Films by a Combination of Optical Shearography and EIS

Picture for The New Concept of Failure of Thin Organic Films by a Combination of Optical Shearography and EIS
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Product Number: 51313-02028-SG
ISBN: 02028 2013 CP
Author: Khaled Habib
Publication Date: 2013
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A critical (steady state) value of the resistivity of different organic coatings was determined by a combination of optical shearography and electrochemical impedance spectroscopy (EIS). The behavior of organic coatings i.e. ACE premium-gray enamel white enamel beige enamel (spray coatings) a yellow acrylic lacquer and a gold nail polish on a metallic alloy i.e. a carbon steel was investigated over a temperature range of 20-60 0C. The value of the resistivity of coatings was determined by correlating the in-plan displacement of the coating (by shearography over a temperature range of 20-60 0C) and the value of the alternating current (A.C) impedance of the coating by EIS in 3% NaCl solution. The integrity of the coatings with respect to time was assessed by comparison the measured value of resistivity to the critical (steady state) or asymptotic value of resistivity. In other words by shearography measurement of coating properties could be performed independent of parameters such as UV exposure humidity presence of chemical species and other parameters which may normally interfere with conventional methods of the assessing of the integrity of coatings. Therefore one may measure the resistivity of coatings regardless of the history of the coating in order to assess the integrity of coatings. Also the obtained shearography data were found to be in a reasonable trend with the data of electrochemical impedance spectroscopy (EIS) in 3%NaCl solution.

Keywords: shearography optical interferometry resistivity in-plan displacement high temperatures carbon steel organic coating electrochemical impedance spectroscopy.

A critical (steady state) value of the resistivity of different organic coatings was determined by a combination of optical shearography and electrochemical impedance spectroscopy (EIS). The behavior of organic coatings i.e. ACE premium-gray enamel white enamel beige enamel (spray coatings) a yellow acrylic lacquer and a gold nail polish on a metallic alloy i.e. a carbon steel was investigated over a temperature range of 20-60 0C. The value of the resistivity of coatings was determined by correlating the in-plan displacement of the coating (by shearography over a temperature range of 20-60 0C) and the value of the alternating current (A.C) impedance of the coating by EIS in 3% NaCl solution. The integrity of the coatings with respect to time was assessed by comparison the measured value of resistivity to the critical (steady state) or asymptotic value of resistivity. In other words by shearography measurement of coating properties could be performed independent of parameters such as UV exposure humidity presence of chemical species and other parameters which may normally interfere with conventional methods of the assessing of the integrity of coatings. Therefore one may measure the resistivity of coatings regardless of the history of the coating in order to assess the integrity of coatings. Also the obtained shearography data were found to be in a reasonable trend with the data of electrochemical impedance spectroscopy (EIS) in 3%NaCl solution.

Keywords: shearography optical interferometry resistivity in-plan displacement high temperatures carbon steel organic coating electrochemical impedance spectroscopy.

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