Corrosion of Magnesium-Aluminum Alloys with Al-11Si/SiC Thermal Spray Composite Coatings in Chloride Solution

Arrabal, R.; Pardo, Á.; Merino, M.C.; Mohedano, M.; Casajús, P.; Matykina, E.

doi:10.1007/s11666-010-9574-0

Cited by 20 publications

(7 citation statements)

References 29 publications

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“…Moreover, pore morphology favours the formation of differential aeration cells . The presence of interconnected pores in thermally sprayed Al and Al‐11Si coatings also reduces the corrosion resistance of the coating, as they allow ready penetration of electrolyte towards the substrate. This effect is clear when the polarization curves of the wrought and the sintered aluminium (Fig.…”

Section: Resultsmentioning

confidence: 99%

Microstructural influence on corrosion properties of aluminium composites reinforced with amorphous iron borides

Abenójar

Bautista

Guzmán

et al. 2012

Materials & Corrosion

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Aluminium composite materials reinforced with amorphous iron borides (Fe/B) have been manufactured following a powder metallurgical (PM) route. Aluminium particles were mixed with 20% (by wt.) Fe/B particles (obtained by mechanical alloying during 36 h from iron and boron powders, 50% by wt. mixture). Mixes were uniaxially pressed and sintered at different temperatures (ranging from 650 to 1100 8C). The effect of sintering temperature on the corrosion resistance of those materials has been studied and related to the formed microstructures. Moreover, those materials were compared to a wrought and a PM plain aluminium. Their behaviour is studied through cyclic anodic polarization curves in chloride media. In the Al þ 20%Fe/B composites, low sintering temperatures (650-950 8C) exert a negative effect. However, when the material was sintered at high temperature (1000-110 08C) its behaviour was very similar to the pure sintered aluminium.

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Section: Resultsmentioning

confidence: 99%

Microstructural influence on corrosion properties of aluminium composites reinforced with amorphous iron borides

Abenójar

Bautista

Guzmán

et al. 2012

Materials & Corrosion

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“…If the porosity is relatively small, up to 4%, the presence of a reinforcing phase improves the corrosion resistance of the Al-20%SiC coatings sprayed by Castodyn DS 8000 oxy-acetylene torch [4]. In our case, it was proposed to reduce the porosity of coatings by shortening the distance between the blowpipe and the workpiece surface or by plastic deformation [1,2,19]. The results presented in [9,17] confirm the usefulness of plastic working to improve the corrosion properties of thermally sprayed Ni-5Al-Al2O3 composite and NiAl, Ni3Al intermetallic coatings.…”

Section: Introductionmentioning

confidence: 85%

“…In the case of the Al-SiC, coatings obtained by the flame spraying the reinforcing particles contribute to increased porosity as compared to aluminium coatings. Porosity is responsible for the permeation of the environment from surface of composite coating to the substrate (Mg-Al alloy), and there are formed galvanic cells [2,4]. The subsurface corrosion was also found under layers of Ni-WC obtained by plasma spraying [11].…”

Section: Introductionmentioning

confidence: 99%

The Quantitative Analysis of the Effect of the Porosity, the Volume of Fraction of Reinforcing Phase and the Thermal Spraying Methods, on Corrosion Properties of Composite Coatings in Marine Environment

Starosta

2016

Journal of KONES. Powertrain and Transport

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In the paper an assessment of the impact of the thermal spray methods, porosity and the volume fraction of reinforcing phase (aluminium oxide) on the corrosion properties (corrosion current density and corrosion potential) of Ni-5%Al alloy coatings and Ni-5%Al-Al2O3 composite coatings reinforced by particle dispersion was presented. The volume fraction of reinforcing phase in the coatings was 15, 30 and 45%. These materials would potentially be used in the shipbuilding industry as regenerative coatings for repair of marine pump shafts. The samples (substrates) were made of carbon C45 (0.45%C) steel. For thermal spray of coatings, two oxy-acetylene (Casto-Dyn DS 8000 and Roto-Tec 80) torches and one plasma gun (PN120) were deployed. The two distances 100 mm and 150 mm from the nozzle onto the substrate were used. In addition, the two substrate temperatures 150°C or 250°C were applied. Corrosion properties of the coatings were tested in a replacement seawater (3.5% NaCl) by polarization curves method. It has been found that among the independent variables considered: a method of thermal spraying, fraction of reinforcing phase and porosity, the last mentioned has the greatest influence on the corrosion properties of thermally sprayed coatings on the matrix of Ni-5% Al. The value of the corrosion potential of coatings depended on the used thermal spray method. It has been found that the more modern method of producing coatings of the higher velocity of the coating material in a sprayed stream has a significant positive effect on the porosity of the coatings. The presence of the reinforcing phase (Al2O3) in composite coatings contributes to a reduction of value of the corrosion current density and increase of the corrosion potential value.

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“…Investigations on thermal-sprayed Al and Al/SiC composites on Mg alloy substrates have been reported. 18 The addition of SiC resulted in higher porosities, and no improvement in corrosion resistance was reported. Postprocessing techniques are often required to densify the coatings.…”

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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Corrosion of Magnesium-Aluminum Alloys with Al-11Si/SiC Thermal Spray Composite Coatings in Chloride Solution

Cited by 20 publications

References 29 publications

Microstructural influence on corrosion properties of aluminium composites reinforced with amorphous iron borides

Microstructural influence on corrosion properties of aluminium composites reinforced with amorphous iron borides

The Quantitative Analysis of the Effect of the Porosity, the Volume of Fraction of Reinforcing Phase and the Thermal Spraying Methods, on Corrosion Properties of Composite Coatings in Marine Environment

Laser Surface Engineering of Magnesium Alloys: A Review

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