Surface characteristics of chemical conversion coating for Mg-Al alloy

Okido, Masazumi; Ichino, Ryoichi; Kim, Seong-Jong; Jang, Seok-Ki

doi:10.1016/s1003-6326(08)60372-6

Cited by 13 publications

(9 citation statements)

References 6 publications

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“…Surface treatment, as another alternative tactic, has been widely employed to restrain the corrosion behavior of metallic Mg materials without changing the substrate properties [ 17 ]. Numerous surface modification methods, including chemical conversion film, electrodeposition, micro-arc oxidation, electrospinning, as well as chemical etching [ 17 , 18 , 19 , 20 , 21 , 22 ], can endow the Mg material with functional characteristics such as superhydrophobic and self-healing properties, which can further ameliorate the anti-corrosive ability of Mg alloys. At present, a mass of literature has reviewed the advances in the cutting-edge development of coatings for Mg alloys.…”

Section: Introductionmentioning

confidence: 99%

Recent Progress in Functionalized Coatings for Corrosion Protection of Magnesium Alloys—A Review

Zhang

Liu

et al. 2022

Materials

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Magnesium (Mg) and its alloys, which have good mechanical properties and damping capacities, are considered as potential candidate materials in the industrial field. Nevertheless, fast corrosion is the main obstacle that seriously hinders its wide applications. Surface modification is an available method to avoid the contact between corrosive media and Mg substrates, thus extending the service life of Mg-based materials. Generally, manufacturing a dense and stable coating as physical barriers can effectively inhibit the corrosion of Mg substrates; however, in some complex service environments, physical barrier coating only may not satisfy the long-term service of Mg alloys. In this case, it is very important to endow the coating with suitable functional characteristics, such as superhydrophobic and self-healing properties. In this review, the various surface treatments reported are presented first, followed by the methods employed for developing superhydrophobic surfaces with micro/nanostructuring, and an overview of the various advanced self-healing coatings, devolved on Mg alloys in the past decade, is further summarized. The corresponding preparation strategies and protection mechanisms of functional coatings are further discussed. A potential research direction is also briefly proposed to help guide functional strategies and inspire further innovations. It is hoped that the summary of this paper will be helpful to the surface modification of Mg alloys and promote the further development of this emerging research field.

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Section: Introductionmentioning

confidence: 99%

Recent Progress in Functionalized Coatings for Corrosion Protection of Magnesium Alloys—A Review

Zhang

Liu

et al. 2022

Materials

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Section: Introductionmentioning

confidence: 99%

“…Chromate conversion coating has been widely used for magnesium alloys due to the high corrosion resistance and remarkable self-healing capability [1,22,23]. However, owing to its high toxicity and carcinogenicity issues, the use of chromate conversion coating is restricted [11,22,24]. More recently, it is studied to seek environmentally friendly and high corrosion resisting films instead of chromate conversion coating [25][26][27][28].…”

Section: Introductionmentioning

confidence: 99%

Electrochemical behaviors of magnesium alloy with phosphate conversion coating in NaCl solutions

Dong

et al. 2016

Rare Met.

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A composite conversion coating was prepared on magnesium alloy by the only one-step immersion treatment. The characteristics of the conversion coating were investigated by scanning electron microscopy (SEM) and X-ray photoelectron spectroscopy (XPS). The results indicate that the composite conversion coating consists of magnesium hydroxide, magnesium phosphate and manganese phosphate. The electrochemical behavior of the conversion coating was investigated systematically by electrochemical impedance spectroscopy (EIS) and potentiodynamic polarization measurement in different NaCl solutions. Polarization measurements and EIS results reveal that the magnesium alloy with the conversion coating have better corrosion resistance compared to the bare magnesium alloy in these conditions. And the corrosion rate of the magnesium alloy with conversion coating increases consistently with the chloride ion concentration. In alkaline conditions, the magnesium alloy with conversion coating has superior corrosion resistance by the synergistic effects between Mg(OH) 2 film and conversion coating. Moreover, the electrochemical corrosion mechanism of the magnesium alloy was analyzed with respect to the conversion coating in a Cl -containing environment.

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“…Due to the high strength/weight ratio, easy processing, excellent physical, and chemical properties, aluminum-magnesium-based alloys have been widely used for the materials of automotive, mobile phone, and aircraft [1,2]. However, low hardness, poor wear resistance, and susceptibility to intergranular corrosion of the aluminum-magnesium alloys hinder their practical application [3].…”

Section: Introductionmentioning

confidence: 99%

Composition and Performance of Nanostructured Zirconium Titanium Conversion Coating on Aluminum‐Magnesium Alloys

Zhang

Tang

et al. 2013

Journal of Nanomaterials

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Nanostructured conversion coating of Al-Mg alloy was obtained via the surface treatment with zirconium titanium salt solution at 25°C for 10 min. The zirconium titanium salt solution is composed of tannic acid 1.00 g·L−1, K2ZrF60.75 g·L−1, NaF 1.25 g·L−1, MgSO41.0 g/L, and tetra-n-butyl titanate (TBT) 0.08 g·L−1. X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and Fourier transform infrared spectrum (FT-IR) were used to characterize the composition and structure of the obtained conversion coating. The morphology of the conversion coating was obtained by atomic force microscopy (AFM) and scanning electron microscopy (SEM). Results exhibit that the zirconium titanium salt conversion coating of Al-Mg alloy contains Ti, Zr, Al, F, O, Mg, C, Na, and so on. The conversion coating with nm level thickness is smooth, uniform, and compact. Corrosion resistance of conversion coating was evaluated in the 3.5 wt.% NaCl electrolyte through polarization curves and electrochemical impedance spectrum (EIS). Self-corrosion current density on the nanostructured conversion coating of Al-Mg alloy is9.7×10-8A·cm-2, which is only 2% of that on the untreated aluminum-magnesium alloy. This result indicates that the corrosion resistance of the conversion coating is improved markedly after chemical conversion treatment.

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Surface characteristics of chemical conversion coating for Mg-Al alloy

Cited by 13 publications

References 6 publications

Recent Progress in Functionalized Coatings for Corrosion Protection of Magnesium Alloys—A Review

Recent Progress in Functionalized Coatings for Corrosion Protection of Magnesium Alloys—A Review

Electrochemical behaviors of magnesium alloy with phosphate conversion coating in NaCl solutions

Composition and Performance of Nanostructured Zirconium Titanium Conversion Coating on Aluminum‐Magnesium Alloys

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