Microstructures and Properties of Corrosion-Resistant Alloys

Dear Colleagues,

The aim of this Special Issue, “Microstructures and Properties of Corrosion-Resistant Alloys”, is to collect research on the latest developments in material properties and characterization, pure/applied corrosion, and the advanced understanding of thermo-mechanical processing. We also welcome papers about the heat treatment, modelling and simulation of alloys.

Authors are invited to present their research using novel approaches related to the properties and microstructures of metals and alloys that affect their mechanical properties, corrosion resistance and other properties.

We aim to publish original peer-reviewed papers in the field of corrosion, forming an important link between material scholars and scientists, as well as with all investigators of metallic materials for various demanding applications.

As Guest Editors, we kindly invite you to contribute both original articles and review works on this topic that deal with the characterization and corrosion resistance evaluation of metals and alloys.

Dr. Yu Cao
Dr. Rui Luo
Dr. Chi Zhang
Guest Editors

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• corrosion-resistant alloy
• microstructure characterization
• mechanical property
• thermo-mechanical processing
• heat treatment
• modelling and simulation

Title: Modeling and prediction of corrosion behavior of 6082/TC4 assembled structure in simulated marine atmospheric environment
Authors: Xiaoguang Sun1,2, Xifeng Fang1, Rui Wang1, Qi Xu1, Wei Wang3
Affiliation: 1. CRRC Qingdao Sifang Co. LTD., Qingdao 266111, China 2. State Key Laboratory of High-speed Maglev Transportation technology, Qingdao 266111, China 3. School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China
Abstract: Aluminum and titanium alloys are promising materials for lightweighting of automobile and transit vehicles. A compound structure composed of both materials are commonly used. However, galvanic corrosion risk needs to be considered. In this study, corrosion behavior of 6082 aluminum alloy/TC4 titanium alloy assembled structure was evaluated by finite element simulations and verified by experimental methods. A three-dimensional geometrical model was constructed and studied in a multi-physical field environment. A galvanic corrosion model was built by riveted coupling and bolted connection of TC4 titanium alloy and 6082 aluminum alloy. COMSOL Multiphysics was used to solve the numerical simulation model and predict the local current density and potential distribution. The simulation results of the riveted and bolted typical structures showed that 6082 aluminum alloy was the most severe corrosion in the marine atmospheric environment. Dynamic potential polarization curves showed that TC4 titanium alloy had a positive balance potential of −0.25 eV and a low corrosion current density of 3.94 × 10−9 A·cm−2, predicting that TC4 titanium alloy had a good corrosion resistance. With the extension of corrosion time, the corrosion depth was still increasing, but the increasing trend was slowing down. After thirty years of service in the marine atmosphere environment, the corrosion depth of the most serious corrosion area could reach 5 ~ 7 mm. The structural parts were also verified experimentally. The modeling results were in good agreement with the experiment results, providing a feasible method to predict the corrosion risk of complex structure and help to optimize anti-corrosion means.

Title: Improved corrosion resistance of AZ31 magnesium alloy coated by composite modification
Authors: Jiajia Chen a; Kunmao Li a, ; Zhenlong Zhu a; Feng Yang a, b; Jing Liu a, *
Affiliation: a School of Materials and Architectural Engineering, Guizhou Normal University, Guiyang 550025, P.R. China b College of Materials and Fujian Key Laboratory of Materials Genome and Xiamen Key Laboratory of High Performance Metals and Materials, Xiamen University, Xiamen 361005, P.R. China
Abstract: Abstract: High corrosion rates always play a major role in hindering application of magnesium (Mg) alloys. To overcome the challenge, a composite modified layer is prepared on the surface of AZ31 alloy by a combination of surface mechanical attrition treatment (SMAT) and hydrothermal (HT). The structure and corrosion resistance of the composite modification layers are systematically investigated. The results showed that the a uniform and dense Mg(OH)2 composite modified layer with a thickness of about 25 μm is formed on the surface of AZ31 alloy through SMAT activation treatment and HT treatment at 120 °C. The AZ31 alloy with Mg(OH)2 composite modified layer exhibited a hydrogen evolution corrosion rate about 7 times lower than substrate lower than substrate. Moreover, the electrochemical corrosion current density of the composite modified layer is reduced by 4 orders of magnitude relative to the matrix. The improvement of corrosion resistance is attributed to the prepared Mg(OH)2 composite modified layer sealing substrate and acting as a barrier to prevent Cl- from eroding the substrate. These findings elucidate the formation mechanism and corrosion resistance of the SMAT+HT composite modified layer, which is helpful for the design and preparation of the corrosion resistant coating of magnesium alloys. Keywords: AZ31 magnesium alloy; Surface mechanical attrition treatment; hydrothermal; Composite surface modification; Corrosion resistance