Protective coatings on magnesium and its alloys — a critical review

Gray, Joy; Luan, B.

doi:10.1016/s0925-8388(01)01899-0

Cited by 2,340 publications

(1,270 citation statements)

References 44 publications

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“…Thus, after long term exposure to the corrosive Hank solution, the specimens were still corroding in some areas. XPS analysis of a sample that had been immersed in Hank's solution identified the main constituents of the layer deposited as a result of a reaction between AZ31 and the solution as Mg 3 (PO 4 ) 2, Ca 3 (PO 4 ) 2, Mg(OH) 2 and some CaCO 3.…”

Section: Electrochemical Behaviourmentioning

confidence: 99%

“…The poor corrosion resistance of magnesium and magnesium alloys is regarded as a major drawback, and significant effort has been focused on improving this. [1][2][3] However, the high reactivity of magnesium alloys in corrosive media can be used to advantage in biomedical applications, particularly in temporary implants where the capacity of a material for bio-degradation is one of the most sought after properties. Indeed, permanent implant materials, such as stainless steel, titanium alloys or Nitinol (55Ni-45Ti), are the only choices currently available for hard tissue implantation.…”

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confidence: 99%

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The Effect of Pre‐Processing and Grain Structure on the Bio‐Corrosion and Fatigue Resistance of Magnesium Alloy AZ31

et al. 2007

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Magnesium alloys are considered as candidate materials for temporary implants. Fatigue resistance and controllable rate of corrosion in bodily fluids are essential for such applications. The effect of the grain structure produced by hot rolling and equal channel angular pressing on the fatigue behaviour and the bio‐corrosion rate were studied for alloy AZ31. The results suggest that mechanical processing can be used to control both properties.

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Section: Electrochemical Behaviourmentioning

confidence: 99%

mentioning

confidence: 99%

The Effect of Pre‐Processing and Grain Structure on the Bio‐Corrosion and Fatigue Resistance of Magnesium Alloy AZ31

et al. 2007

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“…These processes have recently been reviewed by Gray and Luan. 10 Each process has its own advantages and disadvantages.…”

Section: Surface Modification Of Mg and Its Alloysmentioning

confidence: 99%

“…Efforts are being made to produce cost-effective and environment friendly electrolyte solutions. [10][11][12][13] Typical plating defects, such as porosity, tend to accelerate the pitting corrosion of Mg. Electroplating also limits the recycling of Mg because of the presence of heavy metals. Most of the developed conversion coatings cannot be used at elevated temperatures (above 65°C).…”

Section: Surface Modification Of Mg and Its Alloysmentioning

confidence: 99%

Laser Surface Engineering of Magnesium Alloys: A Review

Singh

Harimkar

2012

JOM

121

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Magnesium (Mg) and its alloys are well known for their high specific strength and low density. However, widespread applications of Mg alloys in structural components are impeded by their insufficient wear and corrosion resistance. Various surface engineering approaches, including electrochemical processes (plating, conversion coatings, hydriding, and anodizing), gas-phase deposition (thermal spray, chemical vapor deposition, physical vapor deposition, diamond-like coatings, diffusion coatings, and ion implantation), and organic polymer coatings (painting and powder coating), have been used to improve the surface properties of Mg and its alloys. Recently, laser surface engineering approaches are attracting significant attention because of the wide range of possibilities in achieving the desired microstructural and compositional modifications through a range of laser-material interactions (surface melting, shock peening, and ablation). This article presents a review of various laser surface engineering approaches such as laser surface melting, laser surface alloying, laser surface cladding, laser composite surfacing, and laser shock peening used for surface modification of Mg alloys. The laser-material interactions, microstructural/compositional changes, and properties development (mostly corrosion and wear resistance) accompanied with each of these approaches are reviewed.

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“…difficult surface treatment prior to the process, non-uniformity of the coating and negative effect on the environment [4]. Therefore, the present authors have developed a new cladding process of Mg alloys with pure Al, as a more promising process, by a conventional hot extrusion method with a convex die [9].…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis for thickness uniformity of Al coating layer in extrusion of Mg/Al clad bar

Tokunaga

Szeliga

Matsuura

et al. 2015

Int J Adv Manuf Technol

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Although Mg alloys possess many attractive properties, the use of Mg alloys has been limited due to their extremely poor corrosion resistance. In the authors' previous study, they have developed a new process for Mg/Al cladding by hot extrusion with a convex die. In the extrusion process, it was found that the thickness uniformity of the Al coating layer can be controlled by changing the die angle.However, the optimal condition of the extrusion and the influences of extrusion parameters on the coating thickness uniformity remain unclear. In this study, therefore, the sensitivity analysis has been performed in order to evaluate the influences of extrusion parameters on the coating thickness uniformity.The sensitivities of the following five parameters were evaluated; (1) initial thickness of the coating material plate, (2) extrusion temperature, (3) ram speed, (4) die angle and (5) ratio of simulated flow stress to the experimental one for pure Al. In order to perform the sensitivity analysis, the process for Mg/Al cladding was modelled. The results from the extrusion model fairly agree with the experimental results. Thus, it can be said that the present model of Mg/Al cladding process is reliable. From the sensitivity analysis, it was found that the initial thickness of the coating material plate and die angle influence on the uniformity most. The extrusion temperature, ram speed and flow stress ratio do not have significant influences.

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Protective coatings on magnesium and its alloys — a critical review

Cited by 2,340 publications

References 44 publications

The Effect of Pre‐Processing and Grain Structure on the Bio‐Corrosion and Fatigue Resistance of Magnesium Alloy AZ31

The Effect of Pre‐Processing and Grain Structure on the Bio‐Corrosion and Fatigue Resistance of Magnesium Alloy AZ31

Laser Surface Engineering of Magnesium Alloys: A Review

Sensitivity analysis for thickness uniformity of Al coating layer in extrusion of Mg/Al clad bar

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