Analysis of the dynamics of Intergranular corrosion process of sensitised 304 stainless steel using recurrence plots

Abstract

This study presents the assessment of the dynamics of intergranular corrosion of austenitic stainless steel with different degrees of sensitization through the analysis of electrochemical current noise signals. Samples of S30400 stainless steel were aged at 923 K for 50, 250 and 1,000 min before being quenched in water. The double Loop Electrochemical Potentiokinetic Reactivation test was applied to assess the degree of sensitization. The electrochemical noise data were analysed using a novel mathematical tool named Recurrence Plots (RP). This method allowed us to assess the dynamics of the intergranular corrosion process of the steel in a H 2 SO 4 ? KSCN solution at room temperature. The study was conducted using a recurrence quantification analysis (RQA) from which it was possible to determine the percent of recurrence (%R), the percent of determinism (%D) and the information Entropy of the corrosion process. It was found that these parameters increased with the sensitisation intensity, which indicates that sensitisation induced a more deterministic dynamics on the electrochemical process.

Application of Electrochemical Techniques and Mathematical Simulation in Corrosion and Degradation of Materials

“…This methodology was used also to study the dynamics of intergranular corrosion in austenitic stainless steel with different degree of sensitization (García-Ochoa et al, 2009). …”

“…The periodicity was determined by the increment of %D (percentage of determinism) and R% (the percentage of recurrence) as a function of the degree of sensitisation (DOS) (García-Ochoa et al, 2009). …”

“…Changes in the dynamics of intergranular corrosion of AISI 304 stainless steel as a function of the degree of sensitisation (DOS) was evaluated by EN using recurrence plots for the analysis of current time series (García-Ochoa et al, 2009). Also the microstructure dependant short fatigue crack propagation on AISI 316L SS was distinguished from localised corrosion taking place during corrosion fatigue tests using EN (Acuña et al, 2008).…”

Electrochemical noise analysis on the crevice corrosion behavior of Ni–Cr–Mo–V high strength steel using recurrence plots

“…Some researchers pointed out that EN signals show chaos nature and the geometry of the dynamics exploiting nonlinear dependencies even in non-stationary time series [33][34][35][36]. Recurrence plots analysis is new approach to study the behavior of non-linear dynamical systems [33][34][35][36].…”

“…Recurrence plots analysis is new approach to study the behavior of non-linear dynamical systems [33][34][35][36].…”