Measurement of Surface Resistivity/Conductivity of Carbon Steel in Inhibited Seawater by Optical Interferometry Techniques

Optical interferometry techniques will be used for the first time to measure the surface resistivity/conductivity of carbon steel samples in inhibited solutions, without any physical contact.  This will be achieved by applying an electrical potential across the samples and measuring the current density flow across the samples, during the different polarization tests of the carbon steel samples in inhibited seawater solutions.   In the mean time, optical iterferometry techniques such as holographic interferometry will be used in situ to measure the orthogonal surface displacement of the carbon steel samples, as a result of the applied electrical potential.   In addition, a mathematical model will be derived in order to correlate the ratio of the electrical potential to the current density flow (electrical potential/electronic Current flow=resistance) and to the surface (orthogonal) displacement of the carbon steel samples.   In other words, a proportionality constant (surface resistivity or conductivity=1/ surface resistivity) between the measured electrical resistance and the surface displacement (by the optical interferometry techniques) will be obtained.   Consequently the surface resistivity (r) and conductivity (s) of the carbon steel samples in inhibited seawater solutions will be obtained.   Also, electrical resistivity values (r) from other source will be used for comparison sake with the calculated values of this investigation.