Layered double hydroxide coatings on magnesium alloys: A review

Guo, Ling; Wu, Wei; Zhou, Yongfeng; Zhang, Fen; Zeng, Rong‐Chang; Jian-min, Zhang

doi:10.1016/j.jmst.2018.03.003

Cited by 203 publications

(69 citation statements)

References 117 publications

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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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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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“…The unique structure and properties of LDHs enable them and their derived LDOs and MMOs to be widely used in adsorption, photo(electro)catalysis, medicine, flame retardant and other fields . The large layered structure surface of LDHs provides abundant adsorption catalytic active sites, and the metal semiconductor oxide and composite semiconductor metal oxide obtained after calcination can effectively promote the separation of photo‐generated electrons and holes under appropriate photoelectric stimulation .…”

Section: Introductionmentioning

confidence: 99%

Research Progress in the Field of Adsorption and Catalytic Degradation of Sewage by Hydrotalcite‐Derived Materials

Pan

Tian

et al. 2019

The Chemical Record

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With the rapid development of industry and agriculture and the greatly improved living conditions, the resultant gradually deteriorated environments threaten the human beings. Refractory or even toxic pollutants, which are from different industries such as printing and dyeing, pesticides, chemicals, petrochemicals, plastics and rubber, seriously threat the ecosystems and human health. Having the advantages of flexible composition, unique structure, high stability, memory effect, easy preparation and low cost, hydrotalcite compounds have a great potential in sewage degradation and environmental protection. This study focuses on the adsorption and catalytic properties (such as photocatalysis, electrocatalysis and photoelectrocatalysis) of hydrotalcite-derived materials for treating organic, inorganic and heavy metal ion sewage. The types of adsorption and catalysis, and the effects of various influencing factors on the degradation efficiency were discussed as well.Wiley Online Library 355 Figure 13. The photoelectrocatalytic mechanism of organic pollutant MB over the ZNI-1-MMO-1.5 V photoelectrode.

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“…Therefore, energy consumption of the process must be reduced in order to make this technology commercially viable for high-volume applications [10,14,20,21]. Strategies to achieve this goal involve waveform design and cell geometry [22], electrolyte design [23][24][25][26][27]) and a pre-anodizing approach [18]. An additional strategy consists of "flash" PEO-processes of a short duration (1-3 min) that produce thin coatings (1-5 µm) suitable and sufficient for many corrosion resistance-demanding applications.…”

Section: Introductionmentioning

confidence: 99%

“…), respectively, and A m− is the interlayer anion (e.g., NO 3 − , Cl − , etc.) [26]. It consists of uniform flakes that grow roughly vertically on the substrate and act as intelligent nanocontainers that release, in a controlled way, the previously loaded corrosion inhibitors.…”

Section: Introductionmentioning

confidence: 99%

“…It consists of uniform flakes that grow roughly vertically on the substrate and act as intelligent nanocontainers that release, in a controlled way, the previously loaded corrosion inhibitors. The active corrosion protection mechanism is based on anion-exchange reactions induced by particular triggers, such as increases in the aggressiveness of the surrounding environment or initiation of the corrosion process [26,27]. The most common approach to synthesizing LDH is the in situ growth method, due to its low cost and ease of synthesizing at laboratory and industrial scales [28].…”

Section: Introductionmentioning

confidence: 99%

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LDH Post-Treatment of Flash PEO Coatings

et al. 2019

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This work investigates environmentally friendly alternatives to toxic and carcinogenic Cr (VI)-based surface treatments for aluminium alloys. It is focused on multifunctional thin or flash plasma electrolytic oxidation (PEO)-layered double hydroxides (LDH) coatings. Three PEO coatings developed under a current-controlled mode based on aluminate, silicate and phosphate were selected from 31 processes (with different combinations of electrolytes, electrical conditions and time) according to corrosive behavior and energy consumption. In situ Zn-Al LDH was optimized in terms of chemical composition and exposure time on the bulk material, then applied to the selected PEO coatings. The structure, morphology and composition of PEO coatings with and without Zn-Al-LDH were characterized using XRD, SEM and EDS. Thicker and more porous PEO coatings revealed higher amounts of LDH flakes on their surfaces. The corrosive behavior of the coatings was studied by electrochemical impedance spectroscopy (EIS). The corrosion resistance was enhanced considerably after the PEO coatings formation in comparison with bulk material. Corrosion resistance was not affected after the LDH treatment, which can be considered as a first step in achieving active protection systems by posterior incorporation of green corrosion inhibitors.

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Layered double hydroxide coatings on magnesium alloys: A review

Cited by 203 publications

References 117 publications

Anticorrosion Performance of LDH Coating Prepared by CO₂ Pressurization Method

Anticorrosion Performance of LDH Coating Prepared by CO₂ Pressurization Method

Research Progress in the Field of Adsorption and Catalytic Degradation of Sewage by Hydrotalcite‐Derived Materials

LDH Post-Treatment of Flash PEO Coatings

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Layered double hydroxide coatings on magnesium alloys: A review

Cited by 203 publications

References 117 publications

Anticorrosion Performance of LDH Coating Prepared by CO2 Pressurization Method

Anticorrosion Performance of LDH Coating Prepared by CO2 Pressurization Method

Research Progress in the Field of Adsorption and Catalytic Degradation of Sewage by Hydrotalcite‐Derived Materials

LDH Post-Treatment of Flash PEO Coatings

Contact Info

Product

Resources

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Anticorrosion Performance of LDH Coating Prepared by CO₂ Pressurization Method

Anticorrosion Performance of LDH Coating Prepared by CO₂ Pressurization Method