Effect of additives on structure and corrosion resistance of ceramic coatings on Mg–Li alloy by micro-arc oxidation

Shi, Lingling; Xu, Yingming; Kang, Li; Yao, Zhongping; Wu, Songquan

doi:10.1016/j.cap.2009.10.011

Cited by 107 publications

(54 citation statements)

References 15 publications

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“…In addition, in order to improve the quality of the resulting coatings, increase the electrical conductivity of base electrolyte, and contribute certain elements within the MAO coatings, various additives are added to the base electrolyte (Ref [48][49][50][51][52][53]. It is known that phosphate can produce a sustainable Mg 3 PO 4 ð Þ product to protect the Mg alloys (Ref [54][55][56].…”

Section: Introductionmentioning

confidence: 99%

Effect of KOH Concentration on the Microstructure and Electrochemical Properties of MAO-Coated Mg Alloy AZ31B

Fattah‐alhosseini

Joni

2015

J. of Materi Eng and Perform

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In this study, the effect of KOH concentration on the electrochemical properties of micro-arc oxidation (MAO) coated Mg alloy AZ31B has been investigated. Also, the surface morphology and chemical composition of the MAO coatings have been characterized by scanning electron microscopy and x-ray diffraction. In MAO process, an increase in the concentration of KOH as a result of increase in the electrolyte electrical conductivity leads to a reduction in sparking which in turn improves the quality and the behavior of anodic coatings in the concentration of 2.5 M. Moreover, it can be concluded that the MAO coating shows its best protective behavior when KOH concentration is equal 2.5 M, and if the concentration is higher or lower than this value, the protective properties of MAO coating will decrease.

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Section: Introductionmentioning

confidence: 99%

Effect of KOH Concentration on the Microstructure and Electrochemical Properties of MAO-Coated Mg Alloy AZ31B

Fattah‐alhosseini

Joni

2015

J. of Materi Eng and Perform

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“…However, Mg-Li alloys are highly susceptible to corrosion due to high chemical activities, which limited their industrial applications. Surface treatments have been performed to increase the corrosion resistance of Mg-Li alloys [5][6][7][8][9][10][11].…”

Section: Introductionmentioning

confidence: 99%

Corrosion behavior of Mg–8Li–3Zn–Al alloy in neutral 3.5% NaCl solution

Liu

Meng

Hou

et al. 2016

Journal of Magnesium and Alloys

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The corrosion behavior of Mg-8Li-3Zn-Al alloy was investigated in neutral 3.5% NaCl aqueous solution by morphology observation and electrochemical tests. The weight loss method was to measure the corrosion rate. The electrochemical results indicated that the corrosion resistance of Mg-8Li-3Zn-Al alloy in 3.5% NaCl solution is poorer than that in distilled water. The Cl -anion leads to the initiation and development of the corrosion pits. And the corrosion products are mainly Mg(OH)2.

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“…Among these additives, EDTA (ethylenediamine tetraacetic acid) was commonly used. For instance, Shi et al 13. compared the effects of EDTA and sodium tetraborate as additives within the silicate-phosphate electrolyte and they reported that the corrosion resistance of the coating with EDTA was superior due to the development of a compact coating structure.…”

mentioning

confidence: 99%

Soft plasma electrolysis with complex ions for optimizing electrochemical performance

Kamil

Kaseem

2017

Sci Rep

106

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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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Effect of additives on structure and corrosion resistance of ceramic coatings on Mg–Li alloy by micro-arc oxidation

Cited by 107 publications

References 15 publications

Effect of KOH Concentration on the Microstructure and Electrochemical Properties of MAO-Coated Mg Alloy AZ31B

Effect of KOH Concentration on the Microstructure and Electrochemical Properties of MAO-Coated Mg Alloy AZ31B

Corrosion behavior of Mg–8Li–3Zn–Al alloy in neutral 3.5% NaCl solution

Soft plasma electrolysis with complex ions for optimizing electrochemical performance

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