Improvement of corrosion properties in an aluminum-sprayed AZ31 magnesium alloy by a post-hot pressing and anodizing treatment

Chiu, Liu Ho; Chen, Chun-Chin; Yang, Chao-Fu

doi:10.1016/j.surfcoat.2004.02.035

Cited by 118 publications

(45 citation statements)

References 18 publications

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“…There are various surface treatment technologies available, including laser processing, CVD, PVD methods as well as electroplating, anodizing, thermal spraying, cold spraying, ion implantation, etc. [2][3][4][5][6][7][8][9].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Microstructure of Diffusion Alloyed Layers on Pure Magnesium Substrate/ Wytwarzanie I Struktura Dyfuzyjnych Stopowych Warstw Na Magnezie

Mola¹

2014

Archives of Metallurgy and Materials

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Alloyed layers on pure magnesium were created by means of the heating of the magnesium sample covered with Al+Zn powders mixture containing 20 wt.% Zn and 40 wt.% Zn in vacuum furnace. The microstructure and related composition of the alloyed layers were investigated using optical microscopy and scanning electron microscopy equipped with an energy dispersive X-ray system (EDS). The results revealed that the microstructure, thickness and microhardness of the obtained layers depended on the Zn content in the powder mixture. The alloyed layers were composed of the Mg-Al-Zn intermetallic phases and Mg-based solid solution containing Al and Zn. The multi-phase layer was diffusion bonded with magnesium substrate. The thickness of the layer fabricated by the heat treatment in contact with a powder mixture containing 40 wt.% Zn was twice as high as compared to that obtained with the powder mixture containing 20 wt.% Zn. The hardness value of the alloyed layers was much higher than that of the magnesium substrate.Keywords: magnesium, alloyed coating, Mg-Al-Zn intermetallic phases, hardnessWarstwy stopowe na magnezie zostały wytworzone poprzez wygrzewanie próbek w kontakcie z mieszankami proszków Al+Zn zawierającymi 20% mas. Zn i 40% mas. Zn w piecu próżniowym (oznaczone jako: Al20Zn i Al40Zn). Badania struktury i składu chemicznego przeprowadzono na mikroskopie optycznym oraz elektronowym mikroskopie skaningowym wyposażonym w mikroanalizator rentgenowski. Wyniki badań wykazały, że mikrostruktura, grubość oraz mikrotwardość otrzymanych warstw zależą od zawartości Zn w mieszankach proszków. Warstwy stopowe składały się z faz międzymetalicznych Mg-Al-Zn i roztworu stałego Al i Zn w Mg i były dyfuzyjnie połączone z podłożem-magnezem. Grubość warstwy wytworzonej na podłożu magnezowym poprzez wygrzewanie próbek w kontakcie z mieszanką proszków zawierającą 40% mas. Zn była dwa razy większa w porównaniu do warstwy otrzymanej w mieszance zawierającej 20% mas. Zn. Twardość otrzymanych warstw stopowych była znacznie wyższa w porównaniu do twardości podłoża.

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Section: Introductionmentioning

confidence: 99%

Fabrication and Microstructure of Diffusion Alloyed Layers on Pure Magnesium Substrate/ Wytwarzanie I Struktura Dyfuzyjnych Stopowych Warstw Na Magnezie

Mola¹

2014

Archives of Metallurgy and Materials

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“…However, the intolerable problem of Mg as temporary fixing or biodegradable stents is that fails to complete the restoration by losing the mechanical integrity as the result of their rapid corrosion rate in vivo environment [2]. Therefore, many attempts have been carried out to improve the corrosion resistance properties of magnesium and its alloys for medical implants, including the creation of relatively pure magnesium [4][5], use of novel alloying alloys [6][7][8][9][10], Al and Ti coating [11][12], heat treatment [13][14][15] or alkali-heat treatment [16], electrodeposition hydroxyapatite (HA) coatings [17], and the recent attempts of stearic acid coating [18] and fluoride treatment [19].…”

Section: Introductionmentioning

confidence: 99%

Biocorrosion resistance of coated magnesium alloy by microarc oxidation in electrolyte containing zirconium and calcium salts

Wang

Guo

et al. 2014

Front. Mater. Sci.

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The key to use magnesium alloys as suitable biodegradable implants is how to adjust their degradation rates. We report a strategy to prepare biocompatible ceramic coating with improved biocorrosion resistance property on AZ91D alloy by microarc oxidation (MAO) in a silicate-K 2 ZrF 6 solution with and without Ca(H 2 PO 4 ) 2 additives. The microstructure and biocorrosion of coatings were characterized by XRD and SEM, as well as electrochemical and immersion tests in simulated body fluid (SBF). The results show that the coatings are mainly composed of MgO, Mg 2 SiO 4 , m-ZrO 2 phases, further Ca containing compounds involve the coating by Ca(H 2 PO 4 ) 2 addition in the silicate-K 2 ZrF 6 solution. The corrosion resistance of coated AZ91D alloy is significantly improved compared with the bare one. After immersing in SBF for 28 d, the Si-Zr5-Ca0 coating indicates a best corrosion resistance performance.

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“…Chiu et al [12,13], reported that the aluminum thermal spray coatings on surfaces of AZ31 magnesium alloy presented low corrosion resistance because of their characteristic defects such as pores, cracks or irregularities in phase distribution [11]. Therefore, in order to improve the effectiveness of the coating against corrosion, mechanical, chemical and/or physical post-treatments are commonly applied.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in order to improve the effectiveness of the coating against corrosion, mechanical, chemical and/or physical post-treatments are commonly applied. For example, Chiu et al [12,13] found that the corrosion resistance of the aluminum thermal spray coatings on surfaces of AZ31 magnesium alloy can be improved by hot pressing and anodizing treatments. And Zhongshan et al [14] also improved the corrosion resistance of the magnesium alloy by applying a similar aluminum coating that was heat post-treatment.…”

Section: Introductionmentioning

confidence: 99%

The preparation and corrosion resistance of Al-Ni-Y-Co amorphous and nanocrystalline composite coating

Zhang

Liang²,

Chen³

et al. 2013

Materials and Corrosion

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High velocity arc spraying (HVAS) process was used to deposit Al-Ni-Y-Co amorphous and nanocrystalline composite coating on AZ91 magnesium alloy substrate. The microstructure of the coating was characterized using X-ray diffraction (XRD), scanning electron microscopy (SEM) equipped with energy dispersive spectrometer (EDS) and transmission electron microscopy (TEM). The results show that the coating with thickness of 500 mm presents a dense layered structure with low porosity (1.8%). The coating consists of amorphous, nanocrystalline, and crystalline phases. The microhardness was measured by a microhardness tester. The average values of Vickers hardness for the Al-Ni-Y-Co coating, pure Al coating and AZ91 alloys are about HV 0.1 310, HV 0.1 70, and HV 0.1 60, respectively. The electrochemical corrosion resistance of the coating in 5 wt% NaCl aqueous solution was also investigated, and the results showed that the Al-Ni-Y-Co coating exhibits better corrosion resistance than pure Al coating and AZ91 magnesium alloy.

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Improvement of corrosion properties in an aluminum-sprayed AZ31 magnesium alloy by a post-hot pressing and anodizing treatment

Cited by 118 publications

References 18 publications

Fabrication and Microstructure of Diffusion Alloyed Layers on Pure Magnesium Substrate/ Wytwarzanie I Struktura Dyfuzyjnych Stopowych Warstw Na Magnezie

Fabrication and Microstructure of Diffusion Alloyed Layers on Pure Magnesium Substrate/ Wytwarzanie I Struktura Dyfuzyjnych Stopowych Warstw Na Magnezie

Biocorrosion resistance of coated magnesium alloy by microarc oxidation in electrolyte containing zirconium and calcium salts

The preparation and corrosion resistance of Al-Ni-Y-Co amorphous and nanocrystalline composite coating

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