Protective properties of inhibitor-containing composite coatings on a Mg alloy

Tantalum (Ta) metal is receiving increasing interest as biomaterial for load-bearing orthopedic applications and the synthetic properties of Ta can be tailored by altering its grain structures. This study evaluates the capability of sliding friction treatment (SFT) technique to modulate the comprehensive performances of pure Ta. Specifically, novel nanocrystalline (NC) surface with extremely small grains (average grain size of ≤20 nm) was fabricated on conventional coarse-grained (CG) Ta by SFT. It shows that NC surface possessed higher surface hydrophilicity and enhanced corrosion resistance than CG surface. Additionally, the NC surface adsorbed a notably higher percentage of protein as compared to CG surface. The in vitro results indicated that in the initial culture stages (up to 24 h), the NC surface exhibited considerably enhanced osteoblast adherence and spreading, consistent with demonstrated superior hydrophilicity on NC surface. Furthermore, within the 14 days culture period, NC Ta surface exhibited a remarkable enhancement in osteoblast cell proliferation, maturation and mineralization as compared to CG surface. Ultimately, the improved osteoblast functions together with the good mechanical and anti-corrosion properties render the SFT-processed Ta a promising alternative for the load-bearing bone implant applications.

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“…With regard to the aforementioned CPE , its impedance can be calculated in accordance with the Eq. (1)242930:…”

Section: Resultsmentioning

confidence: 99%

Significantly enhanced osteoblast response to nano-grained pure tantalum

Huo

Zhao

et al. 2017

Sci Rep

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“…weathering, mechanical loading or polarisation [49]. Gnedenkov et al [17] reported inhibitor-containing composite PEO coatings with self-healing functionality, which retained corrosion protection of a Mg alloy after potentiodynamic polarisation tests, showing a relatively good tolerance to the destruction induced by the potentiodynamic polarisation. A similar approach was adopted in the present work to evaluate damage tolerance of the studied coatings.…”

Section: Response To Damage Induced By Anodic Polarisationmentioning

confidence: 98%

“…However, the low corrosion resistance has significantly restricted further applications of magnesium alloys and effective methods are currently being sought to deal with those issues. To date, a great deal of research focusing on understanding corrosion behaviour and enhancement of corrosion protection of magnesium alloys has been carried out [5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. Among these studies, plasma electrolytic oxidation (PEO) coatings have attracted significant attention, because this environmental friendly surface treatment can provide relatively good protection for lightweight metals, such as aluminium, magnesium and titanium [17,18,[20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

Self-healing plasma electrolytic oxidation coatings doped with benzotriazole loaded halloysite nanotubes on AM50 magnesium alloy

et al. 2016

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0 200 -150 0 50 Z (kcm 2 ) Z (kcm 2 )2 Research Highlights  Simple single-step PEO process for production of self-healing coatings on Mg  Benzotriazole loaded halloysite nanotubes incorporated in PEO coatings on Mg  The nanotubes increased mechanical properties of PEO coatings  pH increase at corrosion sites promoted BTA-mediated nucleation of Mg(OH)2  Dense Mg(OH)2 film formed on corrosion sites inhibited pitting corrosion Abstract:Halloysite nanotubes (HNT) and benzotriazole (BTA) loaded HNT were added to a silicatebased electrolyte to produce PEO coatings on AM50 alloy. The coatings were characterised by SEM, EDX and XRD methods. Corrosion behaviour in 3.5 wt.% NaCl was studied by EIS and PDP scans. The HNT increased coating scratch resistance greater than BTA-HNT, although the latter enhanced corrosion resistance due to a self-healing effect. This was triggered by a dense Mg(OH)2 film being formed on corrosion sites following partial coating degradation, preventing pitting corrosion. The single-step process for producing self-healing PEO coatings has good potential in corrosion protection of Mg.

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“…[6][7][8] Micro arc oxidation (MAO) technology, another widely used name of plasma electrolytic oxidation (PEO), is a promising method in the surface treatment of aluminum alloys as it can effectively improve aluminum alloys' hardness, wear resistance and corrosion resistance. [9][10][11][12][13][14] In addition, the coatings with different colors on aluminum alloys are required in the decoration and optical elds. Currently, variety colors of MAO coatings on Al substrates can be obtained from white to black, and the formation mechanism of black MAO coatings has been revealed.…”

Section: 5mentioning

confidence: 99%

Characterization of self-sealing MAO ceramic coatings with green or black color on an Al alloy

Yang

Chen

et al. 2017

RSC Adv.

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Micro arc oxidation (MAO) coatings with green or black color were obtained on a 6061 Al alloy in a new Crcontaining electrolyte system. Compared to the white coatings obtained with traditional electrolytes, this black coating has the characteristics of self-sealing pores and different chemical compositions. The microstructure and composition of the different coatings were comparatively studied by field-emission scanning electron microscopy (FESEM), energy dispersive X-ray spectrometry (EDS) and X-ray photoelectron spectroscopy (XPS), respectively. The mechanical property, tribological behavior and corrosion resistance of the MAO coatings were systematically investigated using nano-indentation, tribological tester and electrochemical corrosion tests. The results indicated that the green MAO coating with a porous structure had Cr 2 O 3 distributed into the Al 2 O 3 ceramic coating with a little of K 2 Cr 2 O 7 addition into the base solution, and the black MAO coating with a self-sealing microstructure contained Cr 2 O 3 and CrO 3 with a large amount of K 2 Cr 2 O 7 addition into the base solution. The hardness values of the MAO coatings with an increase of Cr at% increased first and then decreased due to the compact structure and different compositions of the MAO coatings. Compared with the other MAO coatings, the self-sealing black MAO coating with a high Cr content showed greatly improved wear resistance and corrosion resistance for its special microstructure. Furthermore, the formation mechanism of these MAO coatings with Cr addition has been revealed and the relationship between microstructure and properties has been discussed.

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Protective properties of inhibitor-containing composite coatings on a Mg alloy

Cited by 103 publications

References 54 publications

Significantly enhanced osteoblast response to nano-grained pure tantalum

Significantly enhanced osteoblast response to nano-grained pure tantalum

Self-healing plasma electrolytic oxidation coatings doped with benzotriazole loaded halloysite nanotubes on AM50 magnesium alloy

Characterization of self-sealing MAO ceramic coatings with green or black color on an Al alloy

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