Corrosion and tribocorrosion protection of novel PEO coatings on a secondary cast Al-Si alloy: Influence of polishing and sol-gel sealing

Fernández-López, Patricia; Alves, Sofia A.; Azpitarte, Itziar; San-José, José T.; Bayón, R.

doi:10.1016/j.corsci.2022.110548

Cited by 16 publications

(16 citation statements)

References 92 publications

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“…In [32] it was reported that in the case of porous materials prepared by additive manufacturing, the alloy, especially near the pores, can be dissolved by the electrolyte, therefore impairing the formation of an oxide layer. A similar potential drop was reported in [23] where an aluminate electrolyte was used. The authors claim that the use of such electrolytes may cause the development of a film preventing from a process occurring directly on the metal surface.…”

Section: The Process Of Coating Growthsupporting

confidence: 77%

“…The electrochemical impedance spectroscopy test proved that the sectionalised PEO coating procedure provides better results in corrosion protection in comparison to the results obtained for bare alloy. Proven corrosion protection was also depicted in [23], where aluminate-based electrolytes and the addition of K 2 TiF 6 were proposed for AC-46500 Al-Si (11% Si wt.) secondary cast alloy.…”

Section: Introductionmentioning

confidence: 99%

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Anticorrosive PEO coatings on metallic cast heat enhancers for thermal energy storage

Raźny,

Dmitruk,

Naplocha

2023

Surface Engineering

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The research aims to determine whether a protective oxide coating obtained by plasma electrolytic oxidation (PEO) will prevent unfavourable changes occurring on the surface of aluminium heat enhancers for thermal energy storage (TES) based on phase change materials (PCMs). For domestic purposes (short-term, solar energy), salt hydrates are widely utilised as PCMs. Their low thermal conductivity makes the application of metal enhancers necessary to improve heat transfer in the unit. Due to the chemically aggressive nature of MgCl 2 ·H 2 O, aluminium enhancers can be negatively affected during working cycles. PEO was proposed to overcome corrosion issues in the units. Cast samples, coated with PEO for a short time in KOH-Na 2 SiO 3 electrolyte, were subjected to a molten MgCl 2 ·H 2 O environment. Mass change and the surface were studied via SEM, EDS, and XRD measurements. A thin layer of aluminium oxide prevented castings from changes occurring on the surface of the enhancer.

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Section: The Process Of Coating Growthsupporting

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Anticorrosive PEO coatings on metallic cast heat enhancers for thermal energy storage

Raźny,

Dmitruk,

Naplocha

2023

Surface Engineering

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“…Subsequently, the oxide products are discharged from the discharge channel and deposited on the substrate surface to form micro-protrusions with micro-pores under the cooling effect of the electrolyte. On the other hand, the gas generated from the reaction can produce micro-pores [11]. As the thickness of the MAO coating increases, the energy required to break through the coating becomes greater.…”

Section: Coating Morphology and Structurementioning

confidence: 99%

“…The results of polarization and electrochemical impedance spectroscopy (EIS) corrosion tests show that a lower stand-off distance resulted in a decrease in corrosion potential, current rate, and concentration gradient at the interface. Micro-arc oxidation (MAO) is widely used to prevent corrosion of valve metals such as Mg, Al, Ti, and their alloys [11,12]. Shokouhfar et al studied the corrosion resistance of the ceramic coating on the Ti substrate by MAO in different electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Effects of Micro-Arc Oxidation Surface Treatment on the Corrosion Resistance of Ti-6Al-4V Electron-Beam-Welded Joints

Mei

et al. 2023

Metals

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Micro-arc oxidation (MAO) is performed on Ti-6Al-4V electron-beam-welded joints, and the microstructure, phase composition, and corrosion resistance of the joint and surface coating are investigated systematically by scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDS), X-ray diffraction (XRD), as well as electrochemical and stress corrosion analyses. SEM analyses revealed that the joint undergoes a phase transformation. The coating morphology of the joint and base materials is similar, but the joint coating is denser and thicker. XRD analyses recognize the rutile and anatase phases in the coating. Polarization and electrochemical impedance spectroscopy (EIS) corrosion tests reveal that the MAO treatment results in a decrease of two orders of magnitude in the corrosion current density of the welded joint and an increment of corrosion resistance. Stress corrosion evaluation reveals that a dense layer is exposed to protect the joint after long-term exposure to a high-stress corrosion environment. No stress corrosion-induced cracking or defects are observed in the joints, indicating the corrosion resistance of the joint has significantly improved.

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“…The characteristics of these alloys are their excellent thermal conductivity, electromagnetic damping resistance, biocompatibility, machinability, and recyclable nature [3]. Applications with severe weight restrictions, such as aircraft and automotive components, have given magnesium (Mg) alloys a lot of attention [4,5]. The primary issues with these metals are their extremely poor corrosion and wear resistances.…”

Section: Introductionmentioning

confidence: 99%

Tribo- and Tribocorrosion Properties of Magnesium AZ31 Alloy

et al. 2023

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In automotive and aerospace fields, the use of lightweight materials is required. Magnesium and its alloys combine a low density with high mechanical properties and excellent thermal conductivity. However, those materials suffer from low corrosion and wear resistances. The combined action of corrosion and wear is also critical for these materials. Tribocorrosion of magnesium alloy AZ31 has been investigated with reciprocal sliding wear as a function of the applied load in dry and wet (NaCl) conditions. The study shows that the main wear mechanisms were adhesion, abrasion, and oxidation in dry sliding wear while no adhesion was found in wet sliding wear. Corrosion of the worn surface occurs also in wet sliding wear. It is interesting to notice that wear is less pronounced in wet sliding wear than in dry sliding wear due to the natural lubrication of the NaCl electrolyte. Only severe conditions, high normal load, and wet conditions bring magnesium AZ31 alloy in filiform corrosion.

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Corrosion and tribocorrosion protection of novel PEO coatings on a secondary cast Al-Si alloy: Influence of polishing and sol-gel sealing

Cited by 16 publications

References 92 publications

Anticorrosive PEO coatings on metallic cast heat enhancers for thermal energy storage

Anticorrosive PEO coatings on metallic cast heat enhancers for thermal energy storage

Effects of Micro-Arc Oxidation Surface Treatment on the Corrosion Resistance of Ti-6Al-4V Electron-Beam-Welded Joints

Tribo- and Tribocorrosion Properties of Magnesium AZ31 Alloy

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