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Synergistic effect of seawater's parameters on the corrosion rate of the austenitic stainless steel 304

Acta metallurgica Sinica(English Letters) 2010年第3期23卷 161-170页

作者： S.Atashin m.pakshir A.Yazdani Department of materials Science and Engineering Shiraz University

In this article the corrosion rate of the austenitic stainless steel type 304, under the synergistic effect of environmental factors has been assessed via potentiodynamic polarization ***, velocity, pH and temperature are the factors which induce effects on the corrosion rate of the considered *** analysis is applied using the full two-level factorial experimental design method, which results in the contribution value of each parameter in changing the quantity of average corrosion rate in both individual and synergistic *** this quantitative analysis, qualitative analysis has been used to predict the variation *** two analyses show the important role of the synergistic action, which changes the variation direction of corrosion rate and the contribution percentage of each parameter in varying the value of corrosion *** both these analyses can show the magnitude and quality of each parameter＇s effect, which is remarkably valuable in marine applications.

关键词： Stainless steel 304 Environmental parameters Seawater corrosion Synergistic effect

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Damage mechanism at different transpassive potentials of solution-annealed316 and 3161 stainless steels

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International Journal of minerals,metallurgy and materials 2015年第1期22卷 45-51页

作者： K.morshed Behbahani m.pakshir Z.Abbasi P.Najafisayar Department of materials Science and Engineering School of EngineeringShiraz University

Electrochemical impedance spectroscopy （EIS）, anodic polarization and scanning electron microscopy techniques were used to investigate the damage mechanism in the transpassive potential region of AISI 316 and AISI 316L solution-annealed stainless steels （SS） with different degrees of sensitization. Depending on the DC potential applied during EIS tests, the AC responses in the transpassive region included three different regions：the first one associated with anodic dissolution of the passive layer, the second one contributed to the disso-lution at the area near grain boundaries, and the last one attributed to pitting corrosion. In addition, the fitting results to experimental data showed that as the DC bias during the EIS test increases the charge transfer resistance （Rct） decreases. moreover, the Rct values decreased as the sensitization temperature increases but the AISI 316L SS samples exhibited a higher resistance to intergranular corrosion than 316 SS samples.

关键词： stainless steel annealing intergranular corrosion damage mechanisms

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