Optical interferometry as electrochemical emission spectroscopy of a carbon steel in 5-20 ppm Tros C-70 inhibited seawater

摘要

In the present investigation, holographic interferometry was utilised for the first time to determine the rate change of the number of fringe evolutions during the corrosion of a carbon steel in blank seawater and seawater with different concentrations of a corrosion inhibitor. The anodic dissolution behaviours (corrosion) of the carbon steel was determined simultaneously by holographic interferometry, an electromagnetic method, and by the Electrochemical Impedance (E.I) spectroscopy, an electronic method. The abrupt rate change of the number of the fringe evolutions during corrosion tests, (E.I) spectroscopy, of the carbon steel is called electrochemical emission-spectroscopy. The corrosion of the steel samples was carried out in blank seawater and seawater with different concentrations, (5-2Oppm, of TROS C-70 corrosion inhibitor) using the E.I spectroscopy, at room temperature. The electrochemical-emission spectra of the carbon steel in different solutions represent a detailed picture of the rate change of the anodic dissolution of the steel throughout the corrosion processes. Furthermore, the optical interferometry data of the carbon steel were compared to the data obtained from the E.I. spectroscopy. Consequently, holographic interferometric is found to be very useful for monitoring the anodic dissolution behaviour of metals, in which the number of the fringe evolutions of the steel samples can be determined in-situ.