51312-01083-Surface Resistivity/Conductivity of Different Organic-Thin Films by a Combination of Optical Shearog

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Product Number: 51312-01083-SG

ISBN: 01083 2012 CP

Author: Khaled Habib

Publication Date: 2012

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Optical shearography techniques were used for the first time to measure the surface resistivity/conductivity of different organic-thin films without any physical contact. Different organic coatings such as ACE Premium-grey white and beige Enamels on a metallic alloy i.e. a carbon steel was investigated at a temperature range simulating the severe weather temperatures in Kuwait especially between the daylight and the night time temperatures 20–60 oC. The investigation focused on determining the in-plane displacement of the coatings which amounts to the thermal deformation (strain) with respect to the applied temperature range. Then the alternating current (AC) impedance (resistance) of the coated samples was determined by the technique of electrochemical impedance spectroscopy (EIS) in 3.5 % NaCl solution at room temperature. In addition a mathematical model was derived in order to correlate between the AC impedance (resistance) and to the surface (in-plane) displacement of the samples in solutions. In other words a proportionality constant (surface resistivity or conductivity=1/ surface resistivity) between the determined AC impedance (by EIS technique) and the in-plane displacement (by the optical interferometry techniques) was obtained. Consequently the surface resistivity (r) and conductivity (s) of the coated samples in solutions were obtained. Also electrical resistivity values (r ) from other source were used for comparison with the calculated values of this investigation. This study revealed that the measured value of the resistivity for the anodized coated samples were in a good agreement with the one found in literature for the same coatings. Keywords: Electrical Resistivity Electrical Conductivity Alternating Current (AC) Impedance (Resistance) Optical Shearography Electrochemical Impedance Spectroscopy (EIS) Carbon Steel and Organic Coating.