Corrosion of AZ91D magnesium alloy with a chemical conversion coating and electroless nickel layer
TL;DR: In this paper, a chemical conversion treatment and an electroless nickel plating were applied to AZ91D alloy to improve its corrosion resistance, which was verified by immersion test and potentiodynamic polarization test in 3.5 wt.% NaCl solution.
About: This article is published in Corrosion Science.The article was published on 2004-06-01. It has received 306 citations till now. The article focuses on the topics: Electroless nickel & Electroless nickel plating.
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TL;DR: The analysis of the literature showed that many studies have focused on calcium phosphate coatings produced either using conversion or deposition methods which were developed for orthopaedic applications, however, the control of phases and the formation of cracks still appear unsatisfactory.
1,042 citations
Cites background from "Corrosion of AZ91D magnesium alloy ..."
...Typically, the resulting layer thicknesses are <10 lm [50,55]....
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TL;DR: In this article, a comprehensive review around mechanisms of PEO coatings fabrication and their different properties is provided, and the coatings properties, affecting parameters and improvement strategies are discussed, including corrosion resistance of coatings, important factors in corrosion resistance and methods for corrosion resistance improvement.
349 citations
TL;DR: In this article, the effect of microstructure change on corrosion behavior of equal-channel-angular-pressed (ECAPed) pure Mg was investigated, and the results indicated that the enhanced initial OCP values indicate better weather resistance.
307 citations
TL;DR: In this paper, the performance of several conversion coating technologies is reviewed and the assessment of performance based on the literature to date, thermodynamic analysis has been used to compare coating processes.
Abstract: The corrosion susceptibility of Mg and its alloys in humid and aqueous environments limits their widespread application. The performance of several conversion coating technologies is reviewed herein. In addition to the assessment of performance based on the literature to date, thermodynamic analysis has been used to compare coating processes. Ongoing research reveals that the search for appropriate conversion coatings to replace toxic Cr-based coatings continues. It is seen that the variability between coatings of the same technology was greater than the averages between coating technologies. Additionally, coating pretreatment also appears to be more significant than the choice of coating technology itself.
297 citations
TL;DR: The current research and development status of surface modification technologies of Mg alloys for biomedical materials research is given and the advantages/disadvantages of the different methods and with regard to the most promising method are discussed.
Abstract: In recent years, research on magnesium (Mg) alloys had increased significantly for hard tissue replacement and stent application due to their outstanding advantages. Firstly, Mg alloys have mechanical properties similar to bone which avoid stress shielding. Secondly, they are biocompatible essential to the human metabolism as a factor for many enzymes. In addition, main degradation product Mg is an essential trace element for human enzymes. The most important reason is they are perfectly biodegradable in the body fluid. However, extremely high degradation rate, resulting in too rapid loss of mechanical strength in chloride containing environments limits their applications. Engineered artificial biomaterials with appropriate mechanical properties, surface chemistry, and surface topography are in a great demand. As the interaction between the cells and tissues with biomaterials at the tissue–implant interface is a surface phenomenon; surface properties play a major role in determining both the biological response to implants and the material response to the physiological condition. Therefore, the ability to modify the surface properties while preserve the bulk properties is important, and surface modification to form a hard, biocompatible and corrosion resistant modified layer have always been an interesting topic in biomaterials field. In this article, attempts are made to give an overview of the current research and development status of surface modification technologies of Mg alloys for biomedical materials research. Further, the advantages/disadvantages of the different methods and with regard to the most promising method for Mg alloys are discussed. Finally, the scientific challenges are proposed based on own research and the work of other scientists.
167 citations
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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
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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
TL;DR: Magnesium alloys have high strength/weight ratios, but poor corrosion resistance affects the viability of increased magnesium usage in aerospace and other applications as discussed by the authors, and this review approaches the p...
Abstract: Magnesium alloys have high strength/weight ratios, but poor corrosion resistance affects the viability of increased magnesium usage in aerospace and other applications. This review approaches the p...
700 citations
TL;DR: In this article, the corrosion protection afforded by cerium, lanthanum and praseodymium conversion coatings formed on pure magnesium and a magnesium alloy, WE43, has been studied using dc polarisation and ac impedance techniques.
392 citations
TL;DR: The very low density and excellent castability of magnesium is leading to increased use in various applications, especially in automobiles, despite poor galvanic corrosion resistance and a higher cost than aluminum.
Abstract: The very low density and excellent castability of magnesium is leading to increased use in various applications, especially in automobiles, despite poor galvanic corrosion resistance and a higher cost than aluminum. Further expansion of the magnesium market should come from reduced cost, an increased design base, a better understanding of the scientific underpinning of magnesium alloys, improved protection systems, and the development of cost-affordable cast and wrought products.
235 citations