Effects of addition of Al(NO3)3 to electrolytes on alumina coatings by plasma electrolytic oxidation

Hsu, Chiou-Ting; Teng, Huan-Ping; Lu, Fu-Hsing

doi:10.1016/j.surfcoat.2011.01.024

Cited by 28 publications

(10 citation statements)

References 14 publications

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“…Previous investigations5455 demonstrated that the Al(OH) 3 formation from Al in aqueous solution would result in an amorphous-colloidal form. Hsu et al 55.…”

Section: Discussionmentioning

confidence: 99%

“…Previous investigations5455 demonstrated that the Al(OH) 3 formation from Al in aqueous solution would result in an amorphous-colloidal form. Hsu et al 55. reported that such Al(OH) 3 formation would impede the high electric field between the anode and electrolyte, inhibiting the generation of the plasma discharges.…”

Section: Discussionmentioning

confidence: 99%

“…The decrease in porosity level of the coating layer fabricated in electrolyte containing EDTA-based ions might be related to the influence of the intermediate Al(OH) 3 species via substrate dissolution. Previous investigations 54 55 demonstrated that the Al(OH) 3 formation from Al in aqueous solution would result in an amorphous-colloidal form. Hsu et al .…”

Section: Discussionmentioning

confidence: 99%

“…Hsu et al . 55 reported that such Al(OH) 3 formation would impede the high electric field between the anode and electrolyte, inhibiting the generation of the plasma discharges. In addition, the presence of EDTA was reported to exhibit buffering action 53 which might cause the following effects: (i) stabilization of the electrical double layer, which was important to maintain plasma discharges 56 57 and (ii) inhibition to the structural breakdown of the oxide layer, leading to a more homogeneous electrical field distribution throughout PEO process.…”

Section: Discussionmentioning

confidence: 99%

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Soft plasma electrolysis with complex ions for optimizing electrochemical performance

Kamil

Kaseem

2017

Sci Rep

107

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Plasma electrolytic oxidation (PEO) was a promising surface treatment for light metals to tailor an oxide layer with excellent properties. However, porous coating structure was generally exhibited due to excessive plasma discharges, restraining its performance. The present work utilized ethylenediaminetetraacetic acid (EDTA) and Cu-EDTA complexing agents as electrolyte additives that alter the plasma discharges to improve the electrochemical properties of Al-1.1Mg alloy coated by PEO. To achieve this purpose, PEO coatings were fabricated under an alternating current in silicate electrolytes containing EDTA and Cu-EDTA. EDTA complexes were found to modify the plasma discharging behaviour during PEO that led to a lower porosity than that without additives. This was attributed to a more homogeneous electrical field throughout the PEO process while the coating growth would be maintained by an excess of dissolved Al due to the EDTA complexes. When Cu-EDTA was used, the number of discharge channels in the coating layer was lower than that with EDTA due to the incorporation of Cu2O and CuO altering the dielectric behaviour. Accordingly, the sample in the electrolyte containing Cu-EDTA constituted superior corrosion resistance to that with EDTA. The electrochemical mechanism for excellent corrosion protection was elucidated in the context of equivalent circuit model.

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“…Previous investigations5455 demonstrated that the Al(OH) 3 formation from Al in aqueous solution would result in an amorphous-colloidal form. Hsu et al 55.…”

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

See 2 more Smart Citations

Soft plasma electrolysis with complex ions for optimizing electrochemical performance

Kamil

Kaseem

2017

Sci Rep

107

View full text Add to dashboard Cite

show abstract

“…After years of development, a composite electrolyte system of silicate [7], phosphate [8], aluminate [9], and their combination [10] has been established. Many researchers have invested much effort into examining the influences of electrical parameters such as density [11][12][13], voltage [14,15], duty cycle [16], frequency [17], and the electrolyte, including additive composition [1,18] and different concentration [19].…”

Section: Introductionmentioning

confidence: 99%

Influence of Electrolyte Temperature on the Color Values of Black Plasma Electrolytic Oxidation Coatings on AZ31B Mg Alloy

Liao

Zhu

et al. 2020

Coatings

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A coating was prepared on an AZ31B Mg alloy substrate via black plasma electrolytic oxidation (PEO). The colorant NH4VO3 was added to Na2SiO3–(NaPO3)6 electrolyte at different temperatures (5, 15, 25, and 35 °C). The influences of electrolyte temperature on the structures, compositions, and color values of black PEO coatings were studied by UV–Visible, XRD, XPS, Raman, and SEM techniques. The results showed that the relative content of V2O3 and V2O5 was the key factor affecting the coating color value. At higher temperatures, more NH3 escaped from the electrolyte and the NH3 quantity participating in the reaction decreased, resulting in a decrease of V2O3 content, an increase in color value, and a darker coating. In the PEO process, VO3− mainly reacted to form V2O5, and then, the generated V2O5 reacted with NH3 to form V2O3.

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Effects of Additives on the Microstructure and Tribology Performance of Ta-12W Alloy Micro-Arc Oxidation Coating

Liu,

Hu,

Cheng

et al. 2024

J. Wuhan Univ. Technol.-Mat. Sci. Edit.

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Effects of addition of Al(NO3)3 to electrolytes on alumina coatings by plasma electrolytic oxidation

Cited by 28 publications

References 14 publications

Soft plasma electrolysis with complex ions for optimizing electrochemical performance

Soft plasma electrolysis with complex ions for optimizing electrochemical performance

Influence of Electrolyte Temperature on the Color Values of Black Plasma Electrolytic Oxidation Coatings on AZ31B Mg Alloy

Effects of Additives on the Microstructure and Tribology Performance of Ta-12W Alloy Micro-Arc Oxidation Coating

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