Corrosion fatigue behavior of magnesium alloys under oil environments
25 Mar 2008-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing (Elsevier)-Vol. 477, Iss: 1, pp 129-136
TL;DR: In this paper, the fatigue and mechanochemical behavior of diecast AZ91D and AM50 alloys in air, transmission oil and natural mineral oil at 25°C were studied.
Abstract: The fatigue and mechanochemical behavior of die-cast AZ91D (Mg–9% Al–l% Zn) and AM50 (Mg–5% Al–0.4% Mn) alloys in air, transmission oil and natural mineral oil at 25 °C were studied. New methods were developed in this research in order to achieve better understanding of the mechanochemical effects in Mg alloys during exposure to different oil environments. It is found that the mineral oil environment causes an increase in the lifetime of both alloys in comparison with the gear oil. AM50 alloy shows excellent fatigue lifetime in oil in comparison with other environments. AZ91 shows a significantly higher sensitivity to the environment in comparison with AM50 alloy.
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TL;DR: A review of the available literature on CF of Mg alloys in corrosive environments including simulated-body-fluid (SBF) and the associated fracture mechanism is presented in this paper.
118 citations
Cites background from "Corrosion fatigue behavior of magne..."
...CF testing reported in the literature on Mg alloys [34,45,46,60–62] have generally been carried out under constant amplitude loading, using a single sinusoidal waveform (only tension or tension–compression), whereas, the implants experience variable loadings during walking, running, or jumping....
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97 citations
01 Jan 2010
TL;DR: In this article, a review about the current research on magnesium/magnesium alloys corrosion in the industry is provided, except for reviewing the kinds of corrosion on galvanic corrosion, stress corrosion, and corrosion fatigue, its corresponding mechanisms are also explained.
Abstract: A review is provided about the current research on magnesium/magnesium alloys corrosion in the industry. Except for reviewing the kinds of corrosion on galvanic corrosion, stress corrosion, and corrosion fatigue, its corresponding mechanisms are also explained, such as the influence of metallurgical factors, and environmental factors. Furthermore, the protection of magnesium/magnesium alloys corrosion is presented, for instance, surface treatment/modification, coating and so on. Also, because the continuing challenges associated with the use of magnesium alloys, more considerations about future applications and research directions are given according to the properties improvement of magnesium alloys for the eco-friendly requirements.
71 citations
Cites background from "Corrosion fatigue behavior of magne..."
...Moreover, the fatigue life of magnesium alloys in corrosive solutions such as NaCl, CaCl2 is always less than that in air [40-47]....
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...Literature [47] studied the corrosion fatigue behavior under different oil environmental exposure....
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TL;DR: In this paper, the application of zinc phosphate electrostatic-painting top coating on cold-sprayed AA7075 led to a significant improvement in corrosion-fatigue performance.
Abstract: In this paper, we report the application of zinc phosphate electrostatic-painting top coating on cold sprayed AA7075 leading to a significant improvement in corrosion-fatigue performance. High strength AA7075 powder was sprayed on AZ31B substrate, followed by the application of the top coating. The electrochemical corrosion and corrosion-fatigue tests of the coated and uncoated specimens were performed in 3.5% NaCl solution. Transmission electron microscopy (TEM) analysis showed that a continuous nanolayered mixture of Mg/Al was formed at the cold spray coating/substrate interface leading to high bonding strength. The results showed that the combined coatings improved the corrosion resistance remarkably, and significantly increased the fatigue life, with a fatigue strength of 80 MPa at 107 cycles, as compared to the as-cast specimen. Surface topographic analysis of the corrosion-fatigue-tested specimens demonstrated the presence of deep macro-pits on the cold sprayed AA7075 coating after 3.7 million cycles, while there were no such pits on the top-coated specimens, even after 107 cycles when tested at 30 Hz. The fractographic analysis of the fatigue-fractured specimens showed that the formation of pits allowed the NaCl solution to penetrate in the AZ31B substrate, creating localized corrosion pits resulting in premature failure, which eventually reduced the fatigue life.
21 citations
TL;DR: In this paper, an epoxy coating was applied to improve the corrosion fatigue behavior of AZ31 magnesium alloy in 3.5 wt.% Na2SO4 solution and the bonding interface and the fracture surfaces were investigated by scanning electron microscope.
16 citations
References
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TL;DR: In this paper, a detailed review of the corrosion mechanisms of magnesium alloys is presented, and the basis for the design of new alloys with improved corrosion properties is provided for improving the corrosion properties.
Abstract: The high strength to weight ratio of magnesium alloys makes them extremely attractive for applications in transport or aerospace technology. However, their corrosion behavior is a major issue and one reason why they are still not as popular as aluminum alloys. This papers reviews the corrosion mechanisms of magnesium and provides the basis for the design of new alloys with improved corrosion properties.
1,922 citations
TL;DR: In this paper, the corrosion of die cast AZ91D was studied and related to its microstructure, and it was found that the casting method can influence the corrosion performance by its influence on the alloy microstructures, which is attributed to a combination of higher volume fraction of the beta phase, a more continuous beta phase distribution around finer alpha grains, and lower porosity in the skin layer than in the interior of the die casting.
876 citations
Book•
01 Jan 1992
TL;DR: In this paper, a texture analysis is used to evaluate the effect of texture on the deformation behavior of a cast Mg-Zn-Al-Alloy in a high temperature setting.
Abstract: Partial Table of Contents: ALLOY DEVELOPMENT. Development of Practical High Temperature Magnesium Casting Alloys (J. King). Creep Resistant Mg Alloy Development (K. Pettersen, et al.). New Magnesium Wrought Alloys (C. Jaschik, et al.). Phase Equilibria, Microstructure and Properties of Novel Mg-Mn- Y Alloys (A. Pisch, et al.). TEXTURE AND MICROSTRUCTURE. Texture Analysis as a Tool for Wrought Magnesium Alloy Development (S. Agnew, et al.). Influence of Texture on Deformation Behaviour of Magnesium Alloy AZ31 (R. Gehrmann, et al.). Magnesium Applications in Aerospace and Electronic Industries (B. Landkof). JOINING. Friction Stir Welding of Lightweight Materials (S. Kallee, et al.). MAGNESIUM MATRIX COMPOSITES. Thermal Fatgue of Magnesium Matrix Composites (F. Chmel?k, et al.). Possibilities of the Heat Treatment of MagnesiumMatrix Composites Reinforced with SiC Particles (K. Braszczynska). MECHANICAL DEVELOPMENT. Mechanical Properties of Extruded Magnesium Alloys (B. Closset). Fatigue Design with Cast Magnesium Alloys (C. Sonsino, et al.). Superplasticity of Magnesium-Based Alloys (U. Draugelates, et al.). APPLICATION. High-Speed-Drilling in AZ91 D Without Lubricoolants (F. Tikal, et al.). Cast Magnesium Alloys for Wide Application (P. Detkov, et al.). CORROSION AND SURFACE TREATMENT. Corrosion Properties of Die Cast AM Alloys (M. Videm, et al.). Corrosion Fatigue and Corrosion Creep of Magnesium Alloys (A. Eliezer, et al.). PROCESSING. Quality Index Charts for Mg-based Casting Alloys (C. C?ceres). Semi Solid Injection Molding of MagnesiumAlloys (A. Dworog, et al.). Hydrostatic Extrusion of Magnesium (K. Savage, et al.). Processing of Cellular Magnesium Alloy (Y. Yamada, et al.). PHYSICAL PROPERTIES. Damping in Magnesium and Magnesium Alloys (W. Riehemann). CREEP BEHAVIOUR. Creep of Mg-Zn-Al-Alloys (M. Vogel, et al.). The Microstructure and Creep of an Extruded Mg-Y-Nd Alloy (R. Azari-Khosroshahi). RECYCLING, MELTING, ENVIRONMENTAL. Remelting and Cleaning of Magnesium Scrap (U. Galovsky & M. K?hlein). SIMULATION. An Approach to Determine Solidification Curves of Commercial Magnesium Alloys (D. Mirkovic, et al.). Indexes.
858 citations
05 Feb 2004-Materials Science and Engineering A-structural Materials Properties Microstructure and Processing
TL;DR: In this paper, the corrosion behavior of die cast magnesium alloy AZ91D aged at 160 ◦ C was investigated and the dependence of the corrosion rate on ageing time can be related to the changes in microstructure and local composition during ageing.
Abstract: The corrosion behaviour of die cast magnesium alloy AZ91D aged at 160 ◦ C was investigated. The corrosion rate of the alloy decreases with ageing time in the initial stages and then increases again at ageing times greater than 45 h. The dependence of the corrosion rate on ageing time can be related to the changes in microstructure and local composition during ageing. Precipitation of the phase (Mg17Al12) occurs exclusively along the grain boundaries during ageing. The phase acts as a barrier, resulting in a decreasing corrosion rate in the initial stages of ageing. In the later stages, the decreasing aluminium content of grains makes the matrix more active, causing an increase in the corrosion rate. Electrochemical testing results also confirm the combined effects of the changes in and phases on the corrosion resistance of the aged die cast AZ91D alloy. © 2003 Elsevier B.V. All rights reserved.
401 citations
Book•
01 Dec 1994
TL;DR: Dependence of Thermodynamics and Kinetics of Surface Chemical Reactions on Stressed State of Solids Mechanochemical Activity of solids having Structural Defects Relationships between Local and Integral Mechanochemical activity of Surfaces, Mechanochemical Effect on Solids having Dislocations Chemomechanical Effect and Conjugate Mechanochemical Phenomena.
Abstract: Dependence of Thermodynamics and Kinetics of Surface Chemical Reactions on Stressed State of Solids Mechanochemical Activity of Solids having Structural Defects Relationships between Local and Integral Mechanochemical Activity of Surfaces Kinetics of Mechanochemical Effect on Solids having Dislocations Chemomechanical Effect and Conjugate Mechanochemical Phenomena Some Applications of Mechanochemical Phenomena.
193 citations