Interpretation of current noise generation by a simple model

摘要

The corrosion process of low carbon steel in natural aerated sulphuric acid was examined by electrochemical noise. Noise was interpreted in the time domain in terms of current fluctuations and amplitude distribution. A simple electrochemical model was used to analyse the electrochemical state of steel surface. Stochastic behaviour of the metal-electrolyte interface in the model was based upon the assumption that the elementary fluctuation sources were related to fluxes of electrons that pass from a metal to electron-acceptor ions in solution. The probability that in a certain time a number of successful electron transfers occur, obeyed the Gaussian distribution. At the corrosion potential, it was possible to estimate the corrosion current density (i{sub}(corr)) from the number of successful electron transfers.