Optically transparent Li–Al–CO3 layered double hydroxide thin films on an AZ31 Mg alloy formed by electrochemical deposition and their corrosion resistance in a dilute chloride environment

Syu, Jia-Han; Uan, Jun-Yen; Lin, Mao‐Chao; Lin, Zhi-Yu

doi:10.1016/j.corsci.2012.11.023

Cited by 71 publications

(26 citation statements)

References 45 publications

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“…Recently, some chemical-conversion methods have used the Mg-Al layered double hydroxide (LDH) as a protective film to significantly improve the corrosion resistance of magnesium alloys [21][22][23][24][25][26][27][28] , or OH À , and x has a value between 0.2 and 0.33 [29]. The LDHs have anion exchange capability between chloride ions and the corrosion inhibitor, which allows them to work as self-healing protective coatings [30][31][32].…”

Section: Introductionmentioning

confidence: 99%

Corrosion resistance of Mg(OH)2/Mg–Al layered double hydroxide composite film formed directly on combustion-resistant magnesium alloy AMCa602 by steam coating

et al. 2015

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a b s t r a c tFilms of the Mg(OH) 2 /Mg-Al layered double hydroxide composite were formed on the combustionresistant magnesium alloy AMCa602 by steam coating and characterized by X-ray diffraction, Fourier-transform infrared spectroscopy, and scanning electron microscopy. The corrosion-resistance performances of the films in a 5 wt% NaCl solution were investigated using electrochemical measurements. The corrosion current density of the sample that was steam-coated at 433 K for 6 h using the aqueous solution containing 200 mM Al(NO 3 ) 3 decreased significantly more than that of the bare AMCa602. The correlations between the Mg-Al LDH content in the films, Al(NO 3 ) 3 concentration in the aqueous solutions, and corrosion current densities were investigated.

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Section: Introductionmentioning

confidence: 99%

Corrosion resistance of Mg(OH)2/Mg–Al layered double hydroxide composite film formed directly on combustion-resistant magnesium alloy AMCa602 by steam coating

et al. 2015

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“…Chromium-free acid salt treatment includes: phosphate conversion coating [23,24], phosphate-permanganate conversion coating [25][26][27], stannate conversion coating [28,29], vanadate conversion coating [30,31], cerium conversion coating [32,33], lanthanide conversion coating [34], hydrotalcite surface coating, and so forth [35,36]. Hydrotalcite coating has attracted much attention, due to its unique intercalation structure and its environmentally friendly properties [37][38][39][40][41][42][43][44][45][46][47][48][49][50]. Uan et al [37][38][39][40][41][42][43] has conducted some research on hydrotalcite coatings prepared on magnesium alloys, by adopting a one-step method.…”

Section: Introductionmentioning

confidence: 99%

“…Hydrotalcite coating has attracted much attention, due to its unique intercalation structure and its environmentally friendly properties [37][38][39][40][41][42][43][44][45][46][47][48][49][50]. Uan et al [37][38][39][40][41][42][43] has conducted some research on hydrotalcite coatings prepared on magnesium alloys, by adopting a one-step method. Mg-Al-hydrotalcite layered double hydroxides (LDH) coatings were prepared by letting the carbonate/bicarbonate solutions stand at 50 • C for 24 h. Based on previous research, Uan adopted a two-step method by a 2 h CO 2 and pH 11.5 treatment, to modify the chemical technique.…”

Section: Introductionmentioning

confidence: 99%

Formation Process of an LDHs Coating on Magnesium Alloy by a CO2 Pressurization Method

et al. 2019

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The formation process of LDHs (layered double hydroxides) coating on magnesium alloy by the CO2 pressurization method was studied. The micro-structure was observed by OM, SEM and GAXRD. The weighted gain curve, apparent activation energy, and CO2 solubility curve were all calculated by equations. The potentiodynamic polarization curve, hydrogen evolution data, and immersion were analyzed by an electrochemical method. The results show that the LDHs coating was formed layer-by-layer. The formation positions were initially on the α-Mg phase, and then on the β-Mg17Al12 phase. It was found to be the most compact after 30 min. The LDHs coating began to appear to have severe cracks and holes over time. The formation process of the LDHs coating can be divided into three stages: a rapid growth stage (0–10 min), slow growth stage (10–20 min), and periodic growth stage (30 min, 1 h). The apparent activation energies in each of the three stages are 21.78, 31.86 and 34.92 kJ mol−1, respectively. The LDHs coating has a compact micro-structure and better anti-corrosion at a pressure of 3 MPa, a temperature of 50 °C and a time of 30 min. The CO2 pressurization promotes a formation reaction rate and achieves a high formation efficiency and good formation stability under the condition of zero pollution.

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“…Chen et al [44][45][46] studied the in situ growth mechanism of Mg-Al hydrotalcite conversion coating on AZ31 magnesium alloy. Syu et al [47] further studied an Li-Al-CO 3 double-phase hydroxide coating. Later, Zhang et al [48] used a coprecipitation method to synthesize layered double hydroxides containing magnesium alloy.…”

Section: Introductionmentioning

confidence: 99%

Anticorrosion Performance of LDH Coating Prepared by CO₂ Pressurization Method

Jiang

Bateer

Liu

et al. 2018

International Journal of Corrosion

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Many surface treatment methods are used to improve the corrosion resistance of magnesium alloys. LDH (layered double hydroxides) conversion coatings are currently found in the most environmentally friendly and pollution-free coatings of magnesium alloy. In this study, the CO2 pressurization method was applied to the preparation of LDH coating on magnesium alloy for the first time. The effect of CO2 pressurization on the formation and corrosion resistance of LDH coating on AZ91D alloy was investigated. The hardness and adhesion were significantly higher on LDH coating in the case of CO2 pressurization than it is in atmospheric pressure. The surface and cross-sectional morphologies show that LDH coating is more compact in the case of CO2 pressurization than with atmospheric pressure. The results of the polarization curve, hydrogen evolution, and immersion tests indicate that the corrosion resistance of the LDH coating prepared by the CO2 pressurization method was significantly improved.

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Optically transparent Li–Al–CO3 layered double hydroxide thin films on an AZ31 Mg alloy formed by electrochemical deposition and their corrosion resistance in a dilute chloride environment

Cited by 71 publications

References 45 publications

Corrosion resistance of Mg(OH)2/Mg–Al layered double hydroxide composite film formed directly on combustion-resistant magnesium alloy AMCa602 by steam coating

Corrosion resistance of Mg(OH)2/Mg–Al layered double hydroxide composite film formed directly on combustion-resistant magnesium alloy AMCa602 by steam coating

Formation Process of an LDHs Coating on Magnesium Alloy by a CO2 Pressurization Method

Anticorrosion Performance of LDH Coating Prepared by CO₂ Pressurization Method

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Optically transparent Li–Al–CO3 layered double hydroxide thin films on an AZ31 Mg alloy formed by electrochemical deposition and their corrosion resistance in a dilute chloride environment

Cited by 71 publications

References 45 publications

Corrosion resistance of Mg(OH)2/Mg–Al layered double hydroxide composite film formed directly on combustion-resistant magnesium alloy AMCa602 by steam coating

Corrosion resistance of Mg(OH)2/Mg–Al layered double hydroxide composite film formed directly on combustion-resistant magnesium alloy AMCa602 by steam coating

Formation Process of an LDHs Coating on Magnesium Alloy by a CO2 Pressurization Method

Anticorrosion Performance of LDH Coating Prepared by CO2 Pressurization Method

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Anticorrosion Performance of LDH Coating Prepared by CO₂ Pressurization Method