Effect of Surface Treatment on the Performance of LDH Conversion Films

Tedim, João; Zheludkevich, Mikhail L.; Bastos, A.C.; Salak, Andrei N.; Carneiro, J.; Maia, Frederico; Lisenkov, Aleksey D.; Oliveira, André B.; Ferreira, M. G. S.

doi:10.1149/2.005401eel

Cited by 21 publications

(22 citation statements)

References 3 publications

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“…And, it clearly shows that the LDHs microcrystals have a nest‐like morphology. The surface of films observed in SEM image of LDH‐VO 3 (Figure e,f) becomes more compact, in agreement with previous literature . This can be attributed to the expansion of basal spacing after intercalation of vanadate.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…Apparently, the high nucleation density would be correlated to the high concentration of Al(OH) 4 À released from the substrate in the interfacial regions which played a very important role in the formation of LDH structure. However, the sealing treatment (ST) turned the porous alumina into hydrated alumina, which is amorphous without any typical diffraction peaks.…”

Section: Resultsmentioning

confidence: 99%

“…However, the sealing treatment (ST) turned the porous alumina into hydrated alumina, which is amorphous without any typical diffraction peaks. Thus, the release of Al(OH) 4 À is influenced accordingly. For LDH fabricated on anodic layer with ST, the diffraction peaks show a decreased (0 0 3) reflection intensity and the peaks of (0 0 6) and (0 1 2) planes almost disappear.…”

Section: Resultsmentioning

confidence: 99%

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Enhanced protective Zn–Al layered double hydroxide film fabricated on anodized 2198 aluminum alloy

Zhang

et al. 2015

Journal of Alloys and Compounds

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“…In addition, the phosphating process is quite sensitive to the surface status of Mg substrate as other chemical conversion processes . The pretreatment process is especially important, and suitable pretreatments are effective method to further enhance the properties of chemical conversion films . Previous pretreatment investigations mainly focus on forming a thin surface layer to improve homogeneity and protect the Mg substrate from corrosion .…”

Section: Introductionmentioning

confidence: 99%

An optimization of pretreatment for the phosphate conversion film on WE43 magnesium alloy

Dong

Song

Shan

et al. 2017

Materials & Corrosion

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A two‐step method pretreatment was used to optimize the phosphate conversion film on WE43 magnesium alloy. The surface status of the pretreatment layers and their effect on the formation processes of phosphate conversion films were investigated using scanning electron microscopy (SEM), X‐ray diffraction (XRD), and X‐ray photoelectron spectroscopy (XPS) analyses. It was found that the second phases on the grain boundaries of WE43 were dissolved completely by two‐step method pretreatment. The thin pretreatment film first flaked off in the phosphate process, resulting in a more uniform surface status. Then, the phosphate particles were deposited more homogeneously. Combined with the electrochemical impedance spectroscopy (EIS) and immersion test results, the optimized pretreatment greatly improved the compactness of the conversion films, further to enhance its protective ability to Mg substrate.

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Effect of Surface Treatment on the Performance of LDH Conversion Films

Cited by 21 publications

References 3 publications

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

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

Enhanced protective Zn–Al layered double hydroxide film fabricated on anodized 2198 aluminum alloy

An optimization of pretreatment for the phosphate conversion film on WE43 magnesium alloy

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