Excellent corrosion resistance of P and Fe modified micro-arc oxidation coating on Al alloy

Ji, Shunping; Weng, Yuchang; Wu, Zhongzhen; Ma, Zhengyong; Tian, Xiubo; Fu, Ricky K.Y.; Lin, Hai; Wu, Guosong; Chu, Paul K.; Pan, Feng

doi:10.1016/j.jallcom.2017.03.303

Cited by 52 publications

(18 citation statements)

References 48 publications

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“…Secondly, it appears that MAO coatings can exhibit excellent interfacial cohesion [2,3]; meanwhile, the specific area of the interface between the MAO layers and Al substrate is large, so the stress that can make MAO layers fall out from substrate has been enlarged. As a result, the MAO layers can hardly fall out or be fractured during the deformation of the composite.…”

Section: Time (Min)mentioning

confidence: 99%

“…Microarc oxidation (MAO), a novel technique to form oxide-based layers with special properties on a metal substrate by plasma discharging in aqueous solution under high voltage, is gaining increased attention [1,2]. With the introduction of MAO Al 2 O 3 ceramic coatings on Al-based materials, wear resistance, corrosion resistance, mechanical strength, thermal shock resistance, and electrical insulation of aluminum or its alloys can be efficiently increased [3,4].…”

Section: Introductionmentioning

confidence: 99%

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Preparation and Properties of a Flexible Al₂O₃/Al/Al₂O₃ Composite

Tong

Zhou

Cai

et al. 2018

Advances in Materials Science and Engineering

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A flexible Al2O3/Al/Al2O3 sandwich composite was prepared by microarc oxidation (MAO) on an aluminum foil with 50 μm thickness. The obtained ceramic layers with a thickness of 20–22 μm on the surface of the aluminum foil are mainly Al2O3. The composite, with exterior layers of Al2O3, can be bent more than 90° without observable fracture or delamination. The morphology of the MAO coatings, which has been characterized by scanning electronic microscopy (SEM), is porous and contains microcracks. The energy-dispersive spectrum (EDS) and the X-ray diffraction (XRD) results indicate that the MAO coatings mainly contain γ-Al2O3. Based on experimental observations, the flexibility mechanism was explained by the presence of the microcracks which improve the toughness and decrease the stiffness of the MAO coatings. The well-adhered layers of the sandwich structure can also prevent the fracture of the MAO coating. The thermal diffusivity of the composite is between that of aluminum and Al2O3 and the specific electrical resistance is 45.4% of that of Al2O3 under 50 V. This composite has the potential to be applied as tailorable low-voltage insulation material.

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Section: Time (Min)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Preparation and Properties of a Flexible Al₂O₃/Al/Al₂O₃ Composite

Tong

Zhou

Cai

et al. 2018

Advances in Materials Science and Engineering

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“…The poor corrosion resistance caused by the active chemical properties of aluminum and its alloys greatly restricts their operation life and further applications [2]. In order to improve the corrosion properties of aluminum alloys, great efforts were made using different surface modification methods, such as superhydrophobic surfaces [3,4], conversion coatings [5,6], micro arc oxidation (MAO) [7][8][9], anodic oxidation [10,11], and laser cladding [12,13].…”

Section: Introductionmentioning

confidence: 99%

Binary Additives Enhance Micro Arc Oxidation Coating on 6061Al Alloy with Improved Anti-Corrosion Property

et al. 2020

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Given the corrosion tendency of the natural oxide film of aluminum alloys, micro arc oxidation (MAO) treatment is used as an efficient and economic method to enhance the corrosion resistance. However, irregular voids, pores, and micro cracks are easily formed during the MAO process, which are harmful to the anti-corrosion property of MAO coatings. In this paper, binary additives of electrolytes, including (NaPO 3 ) 6 and H 3 BO 3 , were used to obtain MAO coatings with improved thickness and compact microstructures on 6061 aluminum alloys. The as-prepared coatings were investigated using a thickness meter, scanning electron microscope (SEM), X-ray diffractometer (XRD), and electrochemical impedance spectroscope (EIS). The results showed that the coordinated influence of the binary additives could change the discharge behaviors and micro morphologies of the MAO coatings compared to the base silicate electrolyte. A thicker and stronger MAO coating could be achieved, which was mainly composed of Al 2 O 3 phases. The EIS tests revealed that the corrosion current density of the obtained optimal MAO coating decreased by three orders of magnitude from 1.209 × 10 −6 A·cm −2 to 2.981 × 10 −9 A·cm −2 . We believe that the binary additive-enhanced MAO coatings could provide a promising anti-corrosion solution in various applications.

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“…Previous studies have shown that addition of colored salts to the electrolyte can achieve coloration of the MAO coating, gray MAO coating can be prepared by adding K 2 TiF 6 , and blue MAO coating can be obtained by adding Co (OH) 2 . Some researchers have added soluble iron salts to the electrolyte to explore the corrosion resistance and magnetic properties of the coating . In order to avoid the formation of insoluble precipitates of hydroxides, various ligands were explored to form Fe 3+ complexes with Fe 3+ in alkaline electrolytes.…”

Section: Introductionmentioning

confidence: 99%

Black ceramic coatings prepared in phosphate‐based electrolyte containing Fe³⁺ complexes on ZK61M Mg alloy by micro‐arc oxidation

Song

Wang

Li³

et al. 2019

Surface & Interface Analysis

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Black micro-arc oxidation (MAO) coatings were fabricated on ZK61M Mg alloy in alkaline electrolyte containing sodium phosphate, ferric citrate, and potassium glucose. The formation process of Fe 3+ complexes in the electrolyte and the phase composition and coloration mechanisms of the MAO coatings were investigated.The results showed that Fe 3+ complexes move to the anode and are liable to thermal decomposition continuously in the location of spark discharges, resulting in the formation of iron oxide and magnetite incorporated in the black ceramic coatings.

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Excellent corrosion resistance of P and Fe modified micro-arc oxidation coating on Al alloy

Cited by 52 publications

References 48 publications

Preparation and Properties of a Flexible Al₂O₃/Al/Al₂O₃ Composite

Preparation and Properties of a Flexible Al₂O₃/Al/Al₂O₃ Composite

Binary Additives Enhance Micro Arc Oxidation Coating on 6061Al Alloy with Improved Anti-Corrosion Property

Black ceramic coatings prepared in phosphate‐based electrolyte containing Fe³⁺ complexes on ZK61M Mg alloy by micro‐arc oxidation

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Excellent corrosion resistance of P and Fe modified micro-arc oxidation coating on Al alloy

Cited by 52 publications

References 48 publications

Preparation and Properties of a Flexible Al2O3/Al/Al2O3 Composite

Preparation and Properties of a Flexible Al2O3/Al/Al2O3 Composite

Binary Additives Enhance Micro Arc Oxidation Coating on 6061Al Alloy with Improved Anti-Corrosion Property

Black ceramic coatings prepared in phosphate‐based electrolyte containing Fe3+ complexes on ZK61M Mg alloy by micro‐arc oxidation

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Preparation and Properties of a Flexible Al₂O₃/Al/Al₂O₃ Composite

Preparation and Properties of a Flexible Al₂O₃/Al/Al₂O₃ Composite

Black ceramic coatings prepared in phosphate‐based electrolyte containing Fe³⁺ complexes on ZK61M Mg alloy by micro‐arc oxidation