Corrosion resistance of a self-healing micro-arc oxidation/polymethyltrimethoxysilane composite coating on magnesium alloy AZ31
TL;DR: In this paper, a micro-arc oxidation (MAO)/polymethyltrimethoxysilane (PMTMS) hybrid coating was fabricated via MAO processing and subsequent sealing with alkaline treatment and PMTMS.
About: This article is published in Corrosion Science.The article was published on 2017-04-01. It has received 310 citations till now. The article focuses on the topics: Coating & Pitting corrosion.
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TL;DR: Progress in development of polymeric coatings on biomedical Mg alloys regarding preparation strategy, corrosion resistance and biocompatibility, including polylactic acid (PLA), poly (latic-co-glycolic) acid (PLGA), polycaprolactone (PCL), polydopamine (PDA), collagen (Col) and their composite is summarized.
314 citations
TL;DR: In this paper, the authors reviewed the cutting-edge advances and progress of biodegradable surface coatings upon Mg alloys over the last decades, and aimed to build up a knowledge framework of surface modification on bioregradable Mg alloy.
259 citations
TL;DR: In this paper, a review described a couple of the scientific principles including transient discharge behavior at breakdown, nucleation and growth of inorganic layer, and electrophoresis for incorporating inorganic particle.
212 citations
TL;DR: The fabrication of healable, recyclable, and mechanically tough polyurethane (PU) elastomers with outstanding damage tolerance by coordination of multiblock polymers of poly(dimethylsiloxane) (PDMS)/polycaprolactone (PCL) containing hydrogen and coordination bonding motifs with Zn2+ ions is reported.
Abstract: There is a huge requirement of elastomers for use in tires, seals, and shock absorbers every year worldwide. In view of a sustainable society, the next generation of elastomers is expected to combine outstanding healing, recycling, and damage-tolerant capacities with high strength, elasticity, and toughness. However, it remains challenging to fabricate such elastomers because the mechanisms for the properties mentioned above are mutually exclusive. Herein, the fabrication of healable, recyclable, and mechanically tough polyurethane (PU) elastomers with outstanding damage tolerance by coordination of multiblock polymers of poly(dimethylsiloxane) (PDMS)/polycaprolactone (PCL) containing hydrogen and coordination bonding motifs with Zn2+ ions is reported. The organization of bipyridine groups coordinated with Zn2+ ions, carbamate groups cross-linked with hydrogen bonds, and crystallized PCL segments generates phase-separated dynamic hierarchical domains. Serving as rigid nanofillers capable of deformation and disintegration under an external force, the dynamic hierarchical domains can strengthen the elastomers and significantly enhance their toughness and fracture energy. As a result, the elastomers exhibit a tensile strength of ≈52.4 MPa, a toughness of ≈363.8 MJ m-3 , and an exceptional fracture energy of ≈192.9 kJ m-2 . Furthermore, the elastomers can be conveniently healed and recycled to regain their original mechanical properties and integrity under heating.
201 citations
TL;DR: In this article, the formation mechanism of hybrid organic-inorganic (HOI) materials, including chemical synthesis approaches, and their functional performance could be controlled using structural and compositional designs.
181 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
TL;DR: In this article, a mechanistic overview of the various types of magnesium corrosion is provided, and a theoretical framework for further, much needed research is provided. But, as stated in the introduction, "There is still vast scope both for better fundamental understanding of corrosion processes, engineering usage of magnesium, and also on the corrosion protection of magnesium alloys in service".
Abstract: The purpose of this paper is to provide a succinct but nevertheless complete mechanistic overview of the various types of magnesium corrosion. The understanding of the corrosion processes of magnesium alloys builds upon our understanding of the corrosion of pure magnesium. This provides an understanding of the types of corrosion exhibited by,magnesium alloys, and also of the environmental factors Of most importance. This deep understanding is required as a foundation if we are to produce magnesium alloys much more resistant to corrosion than the present alloys. Much has already been achieved, but there is vast scope for improvement. This present analysis can provide a foundation and a theoretical framework for further, much needed research. There is still vast scope both for better fundamental understanding of corrosion processes, engineering usage of magnesium, and also on the corrosion protection of magnesium alloys in service.
1,713 citations
TL;DR: In this article, a detailed review of various strategies to improve the corrosion resistance of microarc oxidation (MAO) coatings on Mg/Mg alloys is presented.
485 citations
TL;DR: In this paper, the authors summarized the existing fundamental studies and technical developments of anodizing of magnesium alloys, and concluded that new anodising processes based on electrolytic plasma anodization that convert the surface of a magnesium alloy into a hard ceramic coating in an electrolytic bath using high energy electric discharges can offer improved wear and corrosion resistance.
Abstract: This paper reviews various aspects of anodizing of magnesium alloys, such as the basics, processes, properties and applications. It systematically summarises the existing fundamental studies and technical developments of anodizing of magnesium alloys, and concludes that new anodizing processes based on electrolytic plasma anodizing that convert the surface of a magnesium alloy into a hard ceramic coating in an electrolytic bath using high energy electric discharges can offer improved wear and corrosion resistance. These new anodized coatings are often claimed to perform better than the traditional ones obtained through older anodizing processes, such as DOW17 or HAE. The new anodizing techniques are chromate free and hence environment friendly. It is expected that more cost-effective, environment-friendly and non-toxic anodizing techniques will be developed and applied to magnesium alloy components in the future.
435 citations
TL;DR: In this paper, the measurement of polarisation curves for high purity Mg in 3.5% NaCl saturated with Mg(OH)2 using three specimen types: (i) mounted specimens, (ii) specimens hung by fishing line and (iii) plug-in specimens.
354 citations