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Effect of Bimodal Microstructure on Electrochemical Corrosion Behavior of 304 Stainless Steel in 0.5 M H2SO4 Solution

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Bimodal microstructure (BMS) materials are well known for their potential use as optimized structures, possessing both high strength and ductility simultaneously. Electrochemical corrosion behavior of BMS stainless steel (SS) obtained by post-ECAP (equal-channel angular pressing) annealing was investigated by potentiodynamic polarization test, electrochemical impedance spectroscopy (EIS), potentiostatic current transient and capacitance measurement. The results indicate that the BMS SS distinguishes itself from both the coarse crystalline (CC) and nanocrystalline (NC) SS by the medium electrochemical behavior. This is attributed to the "compound" microstructure of the outer passive film on the BMS SS consisting of both the relatively compact and relatively porous parts as it results from the equivalent electrical circuit (EEC) simulation and atomic force microscopy (AFM) observation. These features of the outer passive film are in well corresponding to those of the BMS substrate. In addition, both the inner and outer passive films on the BMS SS are determined by EIS analysis to be less homogeneous as compared to the corresponding films on NC as well as on CC SS, and this is confirmed by the lower values n 1 and n 2.
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Keywords: BIMODAL MICROSTRUCTURE; ELECTROCHEMICAL CORROSION; EQUAL-CHANNEL ANGULAR PRESSING; STAINLESS STEELS

Document Type: Research Article

Publication date: September 1, 2019

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  • Science of Advanced Materials (SAM) is an interdisciplinary peer-reviewed journal consolidating research activities in all aspects of advanced materials in the fields of science, engineering and medicine into a single and unique reference source. SAM provides the means for materials scientists, chemists, physicists, biologists, engineers, ceramicists, metallurgists, theoreticians and technocrats to publish original research articles as reviews with author's photo and short biography, full research articles and communications of important new scientific and technological findings, encompassing the fundamental and applied research in all latest aspects of advanced materials.
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