Holographic interferometry, an electromagnetic method, was used to study corrosion of carbon steel, aluminum and copper nickel alloys in NaOH, KCl and H2SO4 respectively. The technique, called electrochemical emission spectroscopy, consisted of in-situ monitoring of changes in the number of fringe evolutions during the corrosion process. It allowed a detailed picture of anodic dissolution rate changes of alloys. The results were compared to common corrosion measurement methods such as linear polarization resistance and electrochemical impedance spectroscopy. A good agreement between both data was found thus indicating that holographic interferometry can be a very powerful technique for in-situ corrosion monitoring.
Keywords: Holographic Imerferometry, Electrochemical Impedance (E.I) spectroscopy, Electrochemical-Emission Spectroscopy, linear Polarization, Corrosion, and He Ne Laser Light.