Effect of treatment time in the Mg(OH)2/Mg–Al LDH composite film formed on Mg alloy AZ31 by steam coating on the corrosion resistance

Kamiyama, Naosumi; Panomsuwan, Gasidit; Yamamoto, Erina; Sudare, Tomohito; Saito, Nagahiro; Ishizaki, Takahiro

doi:10.1016/j.surfcoat.2015.11.051

Cited by 92 publications

(41 citation statements)

References 37 publications

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“…A number of different approaches has been used in order to obtain LDH layers directly on magnesium alloys. For example, Nakamura and Kamiyama have used LDH-based coatings for corrosion protection of magnesium alloy (AZCa612 and AZ31 respectively) 25 , 26 . In both works, the formation of LDH film was achieved by steam-coating treatment, and improvement in corrosion behaviour was demonstrated.…”

Section: Introductionmentioning

confidence: 99%

Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy

Shulha

Serdechnova

Lamaka

et al. 2018

Sci Rep

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In situ formation of layered double hydroxides (LDH) on metallic surfaces has recently been considered a promising approach for protective conversion surface treatments for Al and Mg alloys. In the case of Mg-based substrates, the formation of LDH on the metal surface is normally performed in autoclave at high temperature (between 130 and 170 °C) and elevated pressure conditions. This hampers the industrial application of MgAl LDH to magnesium substrates. In this paper, the growth of MgAl LDH conversion coating directly on magnesium alloy AZ91 at ambient conditions (25 °C) or elevated temperatures is reported in carbonate free electrolyte for the first time. The direct LDH synthesis on Mg alloys is enabled by the presence of organic chelating agents (NTA and EDTA), which control the amount of free and/or hydroxyl bound Mg2+ and Al3+ in the solution. The application of the chelating agents help overcoming the typical technological limitations of direct LDH synthesis on Mg alloys. The selection of chelators and the optimization of the LDH treatment process are supported by the analysis of the thermodynamic chemical equilibria.

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Section: Introductionmentioning

confidence: 99%

Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy

Shulha

Serdechnova

Lamaka

et al. 2018

Sci Rep

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“…However, chromate is toxic to the environment and hazardous to human beings, leading to it being banned in recent years. Lately, focus has turned to conversion coating that contains no chromium [12,19,20], such as phosphate [21,22], phosphate-permanganate [23][24][25], stannate [26,27], vanadate [28,29], cerate [27,30], lanthanite [31], and LDHs surface coatings [32][33][34][35][36]. Of these, LDH surface coating, as an environmentally friendly coating, has attracted more attention as it brings no pollution to the environment.…”

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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“…Chen and co‐workers even found that no LDH ingredient formed during steam treatment for AZ91D. In order to increase the MgAl‐LDHs content in the composite films, Kamiyama et al introduced Al source in the aqueous solution. In comparison with the former methods, in‐situ method directly grows films on alloy substrate, which can considerably improve the adherence to the substrate and mechanical stability of films.…”

Section: Introductionmentioning

confidence: 99%

A Novel Approach to Fabricate Protective Layered Double Hydroxide Films on the Surface of Anodized Mg‐Al Alloy

Zhang

Tang

et al. 2017

Adv Materials Inter

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In this work, anodic films consisted of a mixed oxide of aluminum and magnesium are developed on magnesium alloy by anodizing process. Then, MgAl-layered double hydroxide (LDH) films are prepared by using this anodic film as a source of cations, without the introduction of any kinds of trivalent metal salts. After that, inhibitor anions of vanadate are intercalated into the interlayer galleries of LDHs through anion-exchange process. LDH conversion films are investigated by scanning electron microscope, energy dispersive spectrum, X-ray diffractometer, and Fourier transform infrared, respectively. Furthermore, the corrosion resistance of LDH conversion films are studied by potentiodynamic polarization, electrochemical impedance spectroscopy, and immersion test in NaCl solution, respectively. The results show that uniform and fine LDH films are successfully fabricated by using only anodic films, and the pores in anodic films are successfully sealed by LDHs. Moreover, the vanadate loaded LDHs exhibit better corrosion resistance compared to LDHs without vanadate.

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Effect of treatment time in the Mg(OH)2/Mg–Al LDH composite film formed on Mg alloy AZ31 by steam coating on the corrosion resistance

Cited by 92 publications

References 37 publications

Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy

Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy

Anticorrosion Performance of LDH Coating Prepared by CO₂ Pressurization Method

A Novel Approach to Fabricate Protective Layered Double Hydroxide Films on the Surface of Anodized Mg‐Al Alloy

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Effect of treatment time in the Mg(OH)2/Mg–Al LDH composite film formed on Mg alloy AZ31 by steam coating on the corrosion resistance

Cited by 92 publications

References 37 publications

Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy

Chelating agent-assisted in situ LDH growth on the surface of magnesium alloy

Anticorrosion Performance of LDH Coating Prepared by CO2 Pressurization Method

A Novel Approach to Fabricate Protective Layered Double Hydroxide Films on the Surface of Anodized Mg‐Al Alloy

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Anticorrosion Performance of LDH Coating Prepared by CO₂ Pressurization Method