Abstract
This paper reviews the current corrosion fatigue strength issues of light metals, which include the corrosion fatigue cracking behaviors, such as the prior-corrosion pit deformation mechanism, the synergistic interaction between prior-corrosion pits and local stress/strain, the coupling damage behavior under mechanical fatigue loading, and the surrounding environmental factors such as a high humidity and a current 3.5 wt.% or 5.0 wt.% NaCl aqueous solution. The characterization of corrosion fatigue crack growth rate based on simple and measurable parameters (crack propagation length and applied stress amplitude or stress intensity factor) is also of great concern in engineering application. In addition, an empirical model to predict S-N curves of aluminum alloys at the environmental conditions was proposed in this paper. One of the main aims was to outline the corrosion fatigue cracking mechanism, which favors the corrosion fatigue residual life prediction of aluminum alloys subjected to the different environmental media that are often encountered in engineering services. Subsequently, this paper explores recently various surface modification technologies to enhance corrosion fatigue resistance and to improve fatigue strength. For example, the fatigue strength of 2024-T4 aluminum alloy has been modified using plasma electrolytic oxidation coating with the impregnation of epoxy resin modification method to compare with other oxide coating or uncoated substrate alloy.
About the authors
Xi-Shu Wang is a Professor at Tsinghua University, China. He received his PhD from Kagoshima University, Japan, in 1997. His research fields are fracture mechanics, fatigue, and corrosive behaviors of materials. His main research achievements are related to the effects of microstructure/prior corrosion on deformation, cracking of various materials, and structure in micro/mesoscale. He has published 160 papers in academic journals and conference proceedings and four books.
Xu-Dong Li is a lecturer at Qingdao Campus of Naval Aeronautical Academy, China. He received his BA and MA degrees from Tsinghua University, China, in 2007 and 2011, respectively. His research fields are corrosion behaviors of light metals, including the prior corrosion cracking behavior of aluminum alloys. He has published 20 papers in academic journals and conference proceedings.
Hui-Hui Yang is a first-year PhD candidate at the Department of Engineering Mechanics, Tsinghua University, China. He received his BA degree from the School of Mechanical and Electrical Engineering, Beijing Institute of Technology, in 2014. His research interests are effects of corrosive media on fatigue behavior of materials and their prevention countermeasures.
Norio Kawagoishi is a Professor Emeritus at Kagoshima University. He received his MA degree in Mechanical Engineering from Kagoshima University in 1972 and his PhD from Kyushu University in 1985. His research interests are fatigue properties of metals in the long-life region, fatigue fracture mechanism in various environments, and surface modification of metals. He has published more than 350 papers in academic journals, conference proceedings, and books.
Pan Pan is a second year MA candidate at the Department of Engineering Mechanics, Tsinghua University, China. He received his BA degree from the School of Civil Engineering and Mechanics, Huazhong University of Science and Technology, in 2012. His research interests are experiment and simulation of electronic packaging multilayer structure under various loadings to propose some novel optimized models.
Acknowledgments
The authors would like to thank the National Natural Science Foundation of China for support (grant no. 11272173).
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