Fundamentals and advances in magnesium alloy corrosion

Recent advances on the development of magnesium alloys for biodegradable implants.

Carbon fiber surfaces and composite interphases

Strategies to improve the corrosion resistance of microarc oxidation (MAO) coated magnesium alloys for degradable implants: Prospects and challenges

The demand for light-weighting in transport and consumer electronics has seen rapid growth in the commercial usage of magnesium (Mg). The major use of Mg is now in cast Mg products, as opposed to the use of Mg as an alloying element in other alloy systems and there is an emerging market of wrought Mg products and biomedical Mg components – such that the past two decades have seen a significant number of new Mg-alloys reported. None-the-less, the corrosion of Mg alloys continues to be a challenge facing engineers seeking weight reductions by deployment of Mg. Herein, authors review the influence of alloying on the corrosion of Mg-alloys, with particular emphasis on the underlying electrochemical kinetics that dictate the ultimate corrosion rate. Such a review focusing on the chemistry–corrosion link, both in depth and in a holistic approach, is lacking. As such the authors do not describe aspects such as high-temperature oxidation or cracking, but focus on delivering the state-of-the-art with regar...

Corrosion of magnesium alloys: the role of alloying

A study of the corrosion of aluminum alloy 2024-T3 under thin electrolyte layers

http://www.ysxbcn.com/down/upfile/soft/200969/02-p0517.pdf

Comparison of corrosion behaviors of AZ31, AZ91, AM60 and ZK60 magnesium alloys

New findings on properties of plasma electrolytic oxidation coatings from study of an Al–Cu–Li alloy

This study compares three types of WC-10Co4Cr coatings deposited with high-velocity oxygen fuel (HVOF) and high-velocity air fuel (HVAF) spraying processes. The experimental results indicated that the decarburisation of the WC in the WC-10Co4Cr coating was dramatically influenced by the spraying equipment, and the non-WC phase content in the as-sprayed coatings greatly influenced their performances. The HVAF-sprayed WC-10Co-4Cr coating revealed the lowest degree of decarburisation, achieving the best properties in terms of hardness, fracture toughness, abrasive and sliding wear as well as electrochemical corrosion resistance when compared to the two HVOF-sprayed WC-10Co-4Cr coatings.

Wear and corrosion performance of WC-10Co4Cr coatings deposited by different HVOF and HVAF spraying processes

Plasma electrolytic oxidation (PEO) of AZ31 magnesium alloy under pulsed bipolar constant current regimes has been carried out in a silicate–hexametaphosphate electrolyte without and with the suspension of SiC nanoparticles. The coatings were characterized by eddy current method, X-ray diffraction (XRD), scanning electron microscopy (SEM), dry sliding wear and electrochemical tests. Higher growth rates were found for the coatings formed with the presence of nanoparticles. The incorporation of SiC nanoparticles into the coatings has been verified by XRD and SEM, and the incorporated particles were found to distribute relatively uniformly along the coating depth. “Weak sites” existed in the SiC free coatings, which significantly lowered the wear performance of the coatings. In contrast, “weak sites” are not found in the coatings with the incorporation of SiC nanoparticles, resulting in an excellent wear performance of the coatings. The applied current densities of the PEO processes also affect the performance of the coatings, with higher wear rates for the coating prepared under higher current densities. All the coatings show improved corrosion resistances.

An improvement of the wear and corrosion resistances of AZ31 magnesium alloy by plasma electrolytic oxidation in a silicate–hexametaphosphate electrolyte with the suspension of SiC nanoparticles

Yingliang Cheng

Papers

A study of the corrosion of aluminum alloy 2024-T3 under thin electrolyte layers

Comparison of corrosion behaviors of AZ31, AZ91, AM60 and ZK60 magnesium alloys

New findings on properties of plasma electrolytic oxidation coatings from study of an Al–Cu–Li alloy

Wear and corrosion performance of WC-10Co4Cr coatings deposited by different HVOF and HVAF spraying processes

An improvement of the wear and corrosion resistances of AZ31 magnesium alloy by plasma electrolytic oxidation in a silicate–hexametaphosphate electrolyte with the suspension of SiC nanoparticles