Fabrication of a superhydrophobic Mg-Mn layered double hydroxides coating on pure magnesium and its corrosion resistance

Kuang, Juan; Ba, Zhixin; Li, Zhuangzhuang; Jia, Yongqiang; Wang, Zhangzhong

doi:10.1016/j.surfcoat.2019.01.009

Cited by 54 publications

(6 citation statements)

References 49 publications

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“…High surface roughness and porous morphology of conversion coatings such as LDH further enhance the water repellent characteristics of the STA modified surface, since more air-pockets are trapped within the coating [ 199 , 392 ]. In spite of the numerous available surfactants, only a few other than STA have been studied to endow conversion coatings with hydrophobicity [ 397 ]. Thus, considering a remarkable improvement in the corrosion resistance of conversion coatings via a simple immersion method, hydrophobization via a post-treatment deserves more attention and further investigation.…”

Section: Conversion Coatingsmentioning

confidence: 99%

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

et al. 2022

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Corrosion protection systems based on hexavalent chromium are traditionally perceived to be a panacea for many engineering metals including magnesium alloys. However, bans and strict application regulations attributed to environmental concerns and the carcinogenic nature of hexavalent chromium have driven a considerable amount of effort into developing safer and more environmentally friendly alternative techniques that provide the desired corrosion protection performance for magnesium and its alloys. Part I of this review series considers the various pre-treatment methods as the earliest step involved in the preparation of Mg surfaces for the purpose of further anti-corrosion treatments. The decisive effect of pre-treatment on the corrosion properties of both bare and coated magnesium is discussed. The second section of this review covers the fundamentals and performance of conventional and state-of-the-art conversion coating formulations including phosphate-based, rare-earth-based, vanadate, fluoride-based, and LDH. In addition, the advantages and challenges of each conversion coating formulation are discussed to accommodate the perspectives on their application and future development. Several auspicious corrosion protection performances have been reported as the outcome of extensive ongoing research dedicated to the development of conversion coatings, which can potentially replace hazardous chromium(VI)-based technologies in industries.

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Section: Conversion Coatingsmentioning

confidence: 99%

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

et al. 2022

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“…[32][33][34] The FTIR spectra of the Zn 2 Cr/Cl samples (Figure 2A) also had bands in the region of 1360 cm -1 , indicating small contamination with carbonate, not observed through XRD since both basal distances were similar and the diffractions peaks overlapped. [35][36][37] In addition to the characteristic bands of the LDH structure, in the spectra of the Zn 2 Cr/Ac samples (Figure 2B) it was possible to identify bands at 1410 and 1560 cm -1 , attributed, respectively, to the symmetric and antisymmetric stretching of C−O bonds of carboxylate groups and bands attributed to C−C (930 cm -1 ) and C−H bonds (2890, 2830, 1340, 1047 and 1020 cm -1 ), confirming the presence of the intercalated acetate anions. 28,[37][38][39][40] According to the higher intensity and sharper diffraction peaks in the XRD patterns, indicating a bigger number of packed layers and consequently higher crystallinity, the best pH values for the syntheses were close to 6 for the Zn 2 Cr/Cl and close to 9 for Zn 2 Cr/Ac, using the chemical concentrations and the synthesis procedure of the present work.…”

Section: Resultsmentioning

confidence: 99%

Synthesis, Characterization, and Anion Exchange Reactions of Zn2Cr Layered Double Hydroxides Intercalated with Acetate and Chloride

Sotiles¹,

Grassi²,

Santos³

et al. 2023

J. Braz. Chem. Soc.

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Layered double hydroxides (LDH) with the composition Zn2Cr, intercalated with acetate and chloride ions were synthesized by co-precipitation with increasing pH and characterized by X-ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and inductively coupled plasma-optical emission spectrometry (ICP-OES). The samples synthesized at optimized pH showed XRD patterns with basal diffraction peaks typical of layered structures, with basal distances of 7.88 and 12.69 Å for intercalated chloride (Zn2Cr/Cl) and acetate (Zn2Cr/Ac), respectively. After optimization experiments, exchange reactions were performed with different anions, using an excess of five times the anions to be intercalated. Zn2Cr/Cl was exchanged with CH3COO−, F−, Br−, I−, SO4 2− and NO3−, and Zn2Cr/Ac was exchanged with F−, Cl−, Br−, I−, SO42− and NO3−. Not all reactions were effective, indicating that among the evaluated anions, CH3COO− was preferred for exchange, mainly attributed to the pre-expansion with bigger anions, facilitating the exchange with smaller anions.

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“…Thus, the in-situ synthesis of Mg–Mn hydrotalcite-like films on magnesium alloys appears suitable for clinical applications. Kuang et al [ 227 ] developed Mg–Mn LDHs coatings on pure Mg by an in-situ growth method, which were chemically modified by adsorption of myristic acid (MA). After modification with myristic acid, the solid-liquid contact angle of the Mg–Mn LDHs film (6.8°) was increased to 152.2°, qualifying as a superhydrophobic coating (i.e.…”

Section: Coatings and Their Current Statusmentioning

confidence: 99%

Progress in bioactive surface coatings on biodegradable Mg alloys: A critical review towards clinical translation

Singh

Batra

Kumar

et al. 2023

Bioactive Materials

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Fabrication of a superhydrophobic Mg-Mn layered double hydroxides coating on pure magnesium and its corrosion resistance

Cited by 54 publications

References 49 publications

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

Chromate-Free Corrosion Protection Strategies for Magnesium Alloys—A Review: PART I—Pre-Treatment and Conversion Coating

Synthesis, Characterization, and Anion Exchange Reactions of Zn2Cr Layered Double Hydroxides Intercalated with Acetate and Chloride

Progress in bioactive surface coatings on biodegradable Mg alloys: A critical review towards clinical translation

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