The Effect of Microstructural Changes on Mechanical and Electrochemical Corrosion Properties of Duplex Stainless Steel Aged for Short Periods

Abstract

This work reports the effects of crystallographic changes due to the secondary phases, in particular sigma (σ), on the mechanical properties and electrochemical behavior of thermally aged duplex stainless steel (DSS). Structural, morphological, mechanical, and electrochemical characterizations were performed. Sigma phase content increased with increasing aging treatment time. It had a lamellar-like shape, as observed by electron backscatter diffractometry (EBSD). Its presence directly damaged mechanical properties. The corrosion assessment included electrochemical impedance spectroscopy (EIS) in 1 M NaCl solution at temperatures of 25, 40, and 65 °C. EIS results demonstrate that an increase in the σ phase content decreased the corrosion resistance (21.1–0.8, 3.5–0.3, and 3.1–0.2 kΩ cm2 at 25, 40, and 60 °C, respectively).

Evaluation of nano mechanical properties and corrosion behavior of diffusion welded CoCrNi medium-entropy alloy (MEA) and SUS 304 stainless steel joints

“…Variation in corrosion resistance of diffusion welded samples joined at different bonding temperatures can be explained based upon IMCs formation. Due to the different electrochemical properties of IMCs and the matrix, localized corrosion along the weld interface is instigated in response to the micro galvanic effect between IMCs and the matrix (Silva et al, 2020;Silva et al, 2021). Thus, corrosion resistance increased when the formation of IMCs along the weld interface was inhibited.…”

Study on Microstructure and Properties of Nickel-Based Self-Lubricating Coating by Laser Cladding

“…Figure 7 shows the polarization curve of grade 45 steel and an Ni35 + 20% SiC + 20% Ni/MoS 2 cladding layer in 3.5% NaCl solution. In the process of electrochemical corrosion, when the corrosion of metal is relatively stable, the potential at this time is self-corrosion potential [41]. The value of self-corrosion potential represents the difficulty of the corrosion of materials [42]; The higher the self-corrosion potential is, the smaller the corrosion tendency of the material is, and the lower the self-corrosion potential is, the greater the corrosion tendency of the material is; The corrosion current corresponding to the selfcorrosion potential is the self-corrosion current, which reflects the speed of corrosion of materials; The greater the self-corrosion current, the greater the corrosion rate of the material, and the smaller the self-corrosion current, the smaller the corrosion rate of the material.…”

Fabrication and characterization of ZrO2 reinforced Fe-20Cr alloy composites

“…High chromium iron alloys are utilized in mining, aerospace, and manufacturing equipment because of their mechanical property, cheap cost, and corrosion resistance [1][2][3][4], The high tensile strength and the melting point of iron and its alloys are suitable for tribological and load-bearing applications [5,6]. The Fe-Cr-based alloys' exceptional wear and corrosion resistance is the primary justification for their use [7].…”