An organic/inorganic composite multi-layer coating to improve the corrosion resistance of AZ31B Mg alloy

Wang, Ying; Gu, Zhengpeng; Liu, Jia; Jiang, Juncheng; Yuan, Ningyi; Pu, Jibin; Ding, Jianning

doi:10.1016/j.surfcoat.2018.12.125

Cited by 56 publications

(23 citation statements)

References 45 publications

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“…Generally, the capacitive loop can be attributed to the charge transfer reaction and layer effects. The inductive loop can be assigned to the physical adsorption processes and pitting corrosion of Mg matrix [8,39]. Compared with the curves between SB and SF, the diameter of the curves in medium frequency range increases remarkably after coating in figure 11(a), and Bode plots shows the impedance modulus (|Z|) value is higher at low frequency range in figure 10(b), which indicates a better corrosion protection for GaN/Al 2 O 3 film [5,40].…”

Section: Electrochemical Testmentioning

confidence: 96%

“…The dissolution of AZ31 Mg alloy and corroded production during corrosion is described by R L and inductance (L). R s /R ct and C show the resistance and capacitive reactance, respectively [8]. Besides, the nonideal resistive and capacitive behavior of the samples are described by the constant phase elements (CPE) , which is described by the formula [35,41]:…”

Section: Electrochemical Testmentioning

confidence: 99%

“…Nevertheless, the poor corrosion resistance due to the low electrode potential and non-compact natural oxidation passive film [3,4], is still the major drawback [5,6]. Surface modification is a main strategy to protect Mg alloys from corrosion [7][8][9]. Generally, the surface modifications can provide a barrier to avoid Mg alloy contacting with the corrosive medium.…”

Section: Introductionmentioning

confidence: 99%

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Microstructure and corrosion behaviors of AZ31 alloy with an amorphous-crystallin nano-composite film

Liu

et al. 2020

Mater. Res. Express

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Magnesium (Mg) alloy has drawn considerable attention for lightweight structural and functional materials, whereas its corrosion resistance still requires to be enhanced. A new strategy for corrosion resistance has been proposed as making an amorphous-crystalline nano-composite film on Mg alloys. The film as the composition as Al 2 O 3 /GaN with a thickness of 20 nm was prepared on AZ31 Mg alloy by atomic layer deposition. Grazing incidence x-ray diffraction, scanning electron microscopy equipped with energy-dispersive spectroscopy, transmission electron microscopy, x-ray photoelectron spectroscopy, and nano indentation tester have been used to characterize the film in details. It is verified the sample has an amorphous/crystalline/Mg interface structure, and a surface with homogeneous elemental distribution and higher hardness. Neutral salt spray test shows the film changes the corroded mode from pitting corrosion to uniform corrosion. Furthermore, electrochemical measurements indicate that the film would raise E corr (ΔE corr =+0.295 V), drop i corr (about 1/10 times), and make electrical equivalent circuits change from R s (CPE R ct (R L L)) to R s (CR f ) (CPE R ct (R L L)). All evaluations show that better corrosion resistance has been by inducing the amorphouscrystalline nano film. The amorphous layer in the film would make a more homogeneous Cl − distribution in the surface and act as a barrier to block the penetration of corrosion medium in the early stage. During corrosion, the interface between the layers in the film could retard the corrosion crack propagating further. The film would be favorate to form a denser corrosion product layer finally. A more uniform and lower corrosion occurs for AZ31 Mg alloy with this nano-composite film.

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Section: Electrochemical Testmentioning

confidence: 96%

Section: Electrochemical Testmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Microstructure and corrosion behaviors of AZ31 alloy with an amorphous-crystallin nano-composite film

Liu

et al. 2020

Mater. Res. Express

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“…For these reasons, a surface treatment of magnesium alloys is almost mandatory in order to improve its corrosion resistance and thereby extend its use to other applications. Among many surface treatments for magnesium and its alloys [12][13][14][15], the development of anodic films on the surface emerge as a fine option. The procedure known as plasma electrolytic oxidation (PEO), allows the development of anodic layers with controlled chemical composition and morphology.…”

Section: Introductionmentioning

confidence: 99%

New insights on the influence of low frequency pulsed current on the characteristics of PEO coatings formed on AZ31B

Toro

Zuleta

Correa

et al. 2020

Mater. Res. Express

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In this work, anodic oxide layers on the surface of an AZ31 magnesium alloy were obtained by plasma electrolytic oxidation (PEO) process under low frequency pulsed current. For this, electrolytical solutions containing hexamethylenetetramine and sodium fluoride were used. The morphology and chemical composition of formed coatings were examined by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), Fourier transform infrared spectroscopy (FTIR) and X-ray diffraction (XRD). Also, salt spray test, hydrogen evolution and electrochemical tests (potentiodynamic polarization and electrochemical impedance spectroscopy) were conducted in order to study the corrosion behavior of the coated samples. It was found that the use of low frequency pulsed current for the PEO process reduces the film porosity and increases its thickness, compared with PEO films obtained by continuous anodization. The effect of the pulsed current signal was also analyzed for a two steps PEO process, observing changes in the morphological characteristics of the coatings which allow a better corrosion according electrochemical tests (short term corrosion measurements). However, long term tests results as hydrogen evolution and salt spray tests, indicated the opposite. Both the film porosity and thickness were affected by either the pulsing of the current or the use of a two-step process.

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“…The excessive density of traditional metal materials causes serious energy waste, which leads to the increase of greenhouse gas emissions and obvious global climate change. Magnesium and its alloys have been widely used in new energy vehicles, aerospace and other fields [1][2][3]. However, magnesium alloy has high self-activity, and is prone to self-corrosion, activation, passivation and other behaviors in humid environment, which seriously affects the stability and utilization of magnesium alloy [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Effect of Cross Rolling on the Corrosion Resistance of AZ31 Magnesium Alloy

Huang¹,

Zou²,

Yang³

et al. 2020

Rev. Chim.

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The effect of different rolling methods on the microstructure and corrosion behavior of AZ31 magnesium alloy in a 3.5% NaCl solution was studied via potentiodynamic polarization scanning, constant current discharge and electrochemical impedance spectroscopy. Results show that the corrosion current densities of cross rolling and unidirectional rolling are 8.60�10-3 and 4.68�10-2 A/cm2, respectively. Their difference is 5.4fold, the charge transfer resistance of cross rolling is large, the corrosion of one-way rolling is more serious than that of cross rolling, the discharge performance of cross rolling is more stable, and the anode polarization is small. After cross rolling, the grain size of the plate is relatively uniform and the corrosion products are non-adherent and less, so it is easy to fall off from its surface, which increases the effective contact between the electrolyte and the alloy surface and has more stable discharge performance.

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An organic/inorganic composite multi-layer coating to improve the corrosion resistance of AZ31B Mg alloy

Cited by 56 publications

References 45 publications

Microstructure and corrosion behaviors of AZ31 alloy with an amorphous-crystallin nano-composite film

Microstructure and corrosion behaviors of AZ31 alloy with an amorphous-crystallin nano-composite film

New insights on the influence of low frequency pulsed current on the characteristics of PEO coatings formed on AZ31B

Effect of Cross Rolling on the Corrosion Resistance of AZ31 Magnesium Alloy

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