Post-treatment of thermal spray coatings on magnesium

Pokhmurska, H.; Wielage, B.; Lampke, Thomas; Grund, Thomas; Студент, М. М.; Chervins’ka, N. R.

doi:10.1016/j.surfcoat.2008.04.036

Cited by 94 publications

(39 citation statements)

References 14 publications

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“…2). Unlike heat posttreatments [29] there was no evidence of deformation or new solidification microstructures in the Al-11Si coatings or magnesium substrates (Fig. 3).…”

Section: Microstructural Characterizationmentioning

confidence: 92%

“…Among gas-phase deposition processes, thermal spray (TS) technology can be used to deposit a wide range of functional coatings designed for specific environments without significantly heating the substrate [8][9][10]. For instance, TS processing is a potential method to produce coatings on transmission and engine parts in the automotive industry [11].…”

Section: Introductionmentioning

confidence: 99%

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Corrosion behaviour of Mg–Al alloys with Al–11Si thermal spray coatings

Pardo¹,

Merino²,

Casajús³

et al. 2009

Materials & Corrosion

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The corrosion resistance of AZ31, AZ80 and AZ91D Mg-Al alloys with Al-11Si thermal spray coatings was evaluated by electrochemical and gravimetric measurements in 3.5 wt% NaCl solution. The changes in the morphology and corrosion behaviour of the Al-11Si coatings induced by a cold-pressing post-treatment under 32 MPa were also examined. The as-sprayed Al-11Si coatings revealed high degree of porosity and poor corrosion protection, which resulted in galvanic acceleration of the corrosion of the magnesium substrates. The application of a cold-pressing post-treatment produced more compact Al-11Si coatings with better bonding at the substrate/coating interface and slightly higher corrosion resistance. However, interconnected pores remained in the cold-pressed coatings due to the low plasticity of the Al-11Si powder and galvanic corrosion of the substrate was observed after immersion in 3.5 wt% NaCl for 10 days.

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“…2). Unlike heat posttreatments [29] there was no evidence of deformation or new solidification microstructures in the Al-11Si coatings or magnesium substrates (Fig. 3).…”

Section: Microstructural Characterizationmentioning

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Corrosion behaviour of Mg–Al alloys with Al–11Si thermal spray coatings

Pardo¹,

Merino²,

Casajús³

et al. 2009

Materials & Corrosion

View full text Add to dashboard Cite

show abstract

“…Additional remelting processes (postprocessing) using laser and electron beam treatments were used to obtain high-performance coatings. 19 The HVOF technique was also used to deposit WC-Co coatings on AZ91 and AE42 Mg alloy substrates. The high velocity of partially melted particles helped in attaining strong bonding and dense coating.…”

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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“…Thus, it has been expected that Al coating on Mg alloys should be an effective way to improve their corrosion resistance. Recently much effort has been devoted to the development of Al coating techniques including plating [7], anodizing [8,9], thermal spray [10][11][12][13] and laser cladding [14,15]. However, in these attempts, several problems still remain unsolved, such as thermal damages of the substrate materials and necessities of surface pretreatments or post-treatments.…”

Section: Introductionmentioning

confidence: 99%