Oxidation kinetics of magnesium alloys treated by tantalum ions implantation

Wang, X.M.; Zeng, Xiaoqin; Wu, Guosong; Yao, Shun; Li, L.B.

doi:10.1016/j.nimb.2007.06.033

Cited by 5 publications

(3 citation statements)

References 32 publications

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“…The evolution of the oxidation state of aluminium, observed by XPS, in the Mg-Al alloys with depth profiling has been assessed in very few studies. We have not found data about alloy AZ61, only metallic Al peaks have been detected on AZ91 alloys by Liu et al [51] and Wang et al [52], and significant quantities of Al2O3 have been detected on AZ31 alloys after prolonged sputtering by Wang et al [53][54][55][56] and, Wang [57].…”

Section: Al2s Xps Spectramentioning

confidence: 86%

Effect of the chemistry and structure of the native oxide surface film on the corrosion properties of commercial AZ31 and AZ61 alloys

Feliú

Maffiotte

Samaniego

et al. 2011

Applied Surface Science

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The purpose of this study has been to advance in knowledge of the chemical composition, structure and thickness of the thin native oxide film formed spontaneously in contact with the laboratory atmosphere on the surface of freshly polished commercial AZ31 and AZ61 alloys with a view to furthering the understanding of protection mechanisms. For comparative purposes, and to more fully describe the behaviour of the native oxide film, the external oxide films formed as a result of the manufacturing process (as-received condition) have been characterised. The technique applied in this research to study the thin oxide films (thickness of just a few nanometres) present on the surface of the alloys has basically been XPS (X-ray photoelectron spectroscopy) in combination with ion sputtering. Corrosion properties of the alloys were studied 2 in 0.6M NaCl by measuring charge transfer resistance values, which are deduced from EIS (electrochemical impedance spectroscopy) measurements after 1 hour of exposure. Alloy AZ61 generally showed better corrosion resistance than AZ31, and the freshly polished alloys showed better corrosion resistance than the alloys in as-received condition. This is attributed to a combination of (1) higher thickness of the native oxide film on the AZ61 alloy and (2) greater uniformity of the oxide film in the polished condition. The formation of an additional oxide layer composed by a mixture of spinel (MgAl 2 O 4) and MgO seems to diminish the protective properties of the passive layer on the surface of the alloys in as-received condition.

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Section: Al2s Xps Spectramentioning

confidence: 86%

Effect of the chemistry and structure of the native oxide surface film on the corrosion properties of commercial AZ31 and AZ61 alloys

Feliú

Maffiotte

Samaniego

et al. 2011

Applied Surface Science

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“…Implantation of tantalum with doses from 1610 16 to 1610 17 ions cm 22 into the AZ31 base was also explored. 157 It is a common observation that surface modifications with Ta significantly improved its isothermal oxidation kinetics at 500uC in pure oxygen, tested for durations up to 90 min. As it was the case with Ce, the highest implantation dose was the most effective.…”

Section: Ion Implantationmentioning

confidence: 99%

The reactive element effect on high-temperature oxidation of magnesium

Czerwiński

2015

International Materials Reviews

108

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It was discovered over 75 years ago that minor additions of elements with high affinity to oxygen exert a profound effect on oxidation resistance of many metals and alloys. In this report, progress in understanding the 'reactive element effect' (REE) and opportunities created for controlling the high-temperature oxidation of magnesium alloys were reviewed. Magnesium, the lightest structural metal, exhibits high affinity to oxygen and, as opposed to heat-resistant materials, does not form a dense, slow-growing and protective oxide layer. However, additions of small amounts of reactive elements (REs) to magnesium alloys produce a number of positive effects in improving their oxidation resistance. What is of crucial importance for magnesium is that RE benefits are also extended to its ignition, flammability, evaporation and liquid-state reactivity. The mechanism by which these elements influence oxidation and other related behaviour remains, so far, unclear. Although no specific theory explaining the REE on magnesium has been developed, growth kinetics, surface morphology and internal microstructure of magnesia films and scales, doped with REs show characteristics typical for high-temperature materials that form protective oxides.

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“…Passive layers on the surface of stainless steel formed by Mo implantation that resulted in improvement of its resistance on corrosion [13], also Ta implantation to the Al-Mg alloys increased the oxidation resistance of that alloy [14] as well as hardness and elastic modulus of the Mo implanted aluminum alloy [15]. A similar effect of increased hardness and reduced friction coefficient was observed in the case of the Ta implanted Al-Mg alloy as a result of Ta 2 O 5 layer formation [16].…”

Section: Introductionmentioning

confidence: 99%

Production of Molybdenum and Tantalum Ion Beams using CCl₂F₂

et al. 2017

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A new method of refractory metal (like Mo and Ta) ion beam production using the arc discharge ion source and CCl2F2 (dichlorodifluoromethane) used as a feeding gas supported into the discharge chamber is presented. It is based on etching of the refractory metal parts (e.g. anode or a dedicated tube) Cl and F containing plasma. The results of measurements of the dependences of ion currents on the working parameters like discharge and filament currents as well as on the magnetic field flux density of an external electromagnet coil are shown and discussed. The separated Mo + and Ta + beam currents of approximately 22 µA and 2 µA, respectively, were obtained.

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Oxidation kinetics of magnesium alloys treated by tantalum ions implantation

Cited by 5 publications

References 32 publications

Effect of the chemistry and structure of the native oxide surface film on the corrosion properties of commercial AZ31 and AZ61 alloys

Effect of the chemistry and structure of the native oxide surface film on the corrosion properties of commercial AZ31 and AZ61 alloys

The reactive element effect on high-temperature oxidation of magnesium

Production of Molybdenum and Tantalum Ion Beams using CCl₂F₂

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Oxidation kinetics of magnesium alloys treated by tantalum ions implantation

Cited by 5 publications

References 32 publications

Effect of the chemistry and structure of the native oxide surface film on the corrosion properties of commercial AZ31 and AZ61 alloys

Effect of the chemistry and structure of the native oxide surface film on the corrosion properties of commercial AZ31 and AZ61 alloys

The reactive element effect on high-temperature oxidation of magnesium

Production of Molybdenum and Tantalum Ion Beams using CCl2F2

Contact Info

Product

Resources

About

Production of Molybdenum and Tantalum Ion Beams using CCl₂F₂