Multifractal Hurst Analysis for Identification of Corrosion Type in AISI 304 Stainless Steel

摘要

Fractal analysis methods are able to characterize complex time-series and images. In electrochemicalcorrosion, fractal parameters (fractal dimension, scaling exponent, correlation factors, etc.) have beencorrelated to the corrosion mechanism, the surface roughness and long-term behavior. In this work, atwo-dimensional re-scaled Hurst analysis method has been utilized for determining the scaling Hurstexponent resulting from the electrochemical corrosion of AISI 304 stainless steel (SS) exposed toFeCl3 and NaOH solutions. It is found that the AISI 304 SS exposed to FeCl3 a NaCl solutions exhibitspositive correlations and multifractal properties. In order to quantify the complexity of the corrodedsurfaces and establish a correlation with the corrosion type a multifractal index is calculated.