The n-MAO/EPD bio-ceramic composite coating fabricated on ZK60 magnesium alloy using combined micro-arc oxidation with electrophoretic deposition

Xiong, Ying; Lü, Chao; Wang, Chao; Song, Renguo

doi:10.1016/j.apsusc.2014.10.103

Cited by 60 publications

(17 citation statements)

References 40 publications

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“…Generally, the values of I corr , E corr , and R p are important parameters for evaluating the corrosion properties of coatings. Lower I corr , positive E corr , and higher R p indicate that the coating provides better corrosion resistance [ 30 ]. Therefore, the corrosion resistances of the coatings were sorted as follows: coating IV > coating I > coating II > coating III.…”

Section: Resultsmentioning

confidence: 99%

Microstructures and Properties of Laser Cladding Al-TiC-CeO2 Composite Coatings

Dejun

Song

2018

Materials

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Al-TiC-CeO2 composite coatings have been prepared by using a laser cladding technique, and the microstructure and properties of the resulting composite coatings have been investigated using scanning electron microscopy (SEM), a 3D microscope system, X-ray diffraction (XRD), micro-hardness testing, X-ray stress measurements, friction and wear testing, and an electrochemical workstation. The results showed that an Al-Fe phase appears in the coatings under different applied laser powers and shows good metallurgical bonding with the matrix. The dilution rate of the coating first decreases and then increases with increasing laser power. The coating was transformed from massive and short rod-like structures into a fine granular structure, and the effect of fine grain strengthening is significant. The microhardness of the coatings first decreases and then increases with increasing laser power, and the maximum microhardness can reach 964.3 HV0.2. In addition, the residual stress of the coating surface was tensile stress, and crack size increases with increasing stress. When the laser power was 1.6 kW, the coating showed high corrosion resistance.

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Section: Resultsmentioning

confidence: 99%

Microstructures and Properties of Laser Cladding Al-TiC-CeO2 Composite Coatings

Dejun

Song

2018

Materials

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“…Numerous attempts such as modifying treatment parameters or introducing various micro-and nanoparticles into electrolytes [7][8][9][10][11][12][13][14][15][16][17] have been made to increase corrosion resistance of PEO coatings. However, none of them was successful.…”

Section: Introductionmentioning

confidence: 99%

Corrosion protection of magnesium alloy by PEO-coatings containing sodium oleate

2019

Int. J. Corros. Scale Inhib.

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The kinetics of plasma-electrolytic oxidation (PEO) coating growth on AZ31 alloy in an alkaline-phosphate-aluminate electrolyte was studied. The structure, elemental composition and corrosion resistance of obtained PEO coatings were studied as a function of thickness. It was established that formation of the coating layers takes place in the following sequence: anodic, external and internal layers. Their formation occurs due to: 1) dielectric layer formation due to anodic conversion of surface; 2) ignition of powerful microdischarges in the transversal pores of the initially formed coating, forming the main part of its outer layer in case of increasing duration of the PEO process; 3) etching of magnesium alloy as a result of electrolyte penetration through the transversal pores to the metal substrate, followed by its anodizing; 4) ignition of microdischarges under the coatings outer layer, leading to formation of an inner layer. Existence of the coating inner layer causes a significant increase in corrosion resistance; however, it is still insufficient for long-lasting standalone corrosion protection. It was shown that sodium oleate (SOl) is the best inhibitor for the AZ31 substrate, therefore it was selected for impregnating PEO coatings. Impregnation of the coatings in 10 mM SOl solution increases their protective ability. Corrosion tests of PEO coated AZ31 samples in a climate chamber showed that the effect of impregnating is most pronounced for thin PEO coatings (20 μm). Under more corrosive conditions of salt spray test, impregnating the PEO coating with SOl increased the time until the appearance of the first corrosion marks. It also significantly slowed down the development of the corrosion marks compared with the samples coated by PEO without impregnation.

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“…Due to its non-pollution and cleaning characteristics, more and more attention has been paid to the plasma electrolytic oxidation technology. However, there are still a lot of research studies on the corrosion resistance of plasma electrolytic oxidation technology [ 19 , 20 ].…”

Section: Introductionmentioning

confidence: 99%

Microstructure and Corrosion Resistance of PEO Coatings Formed on KBM10 Mg Alloy Pretreated with Nd(NO3)3

Jun

et al. 2018

Materials

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Plasma electrolytic oxidation (PEO) technique is one of the important methods used in the surface modification of magnesium alloys. In this paper, the ceramic coatings on pretreated KBM10 magnesium alloy with Nd(NO3)3 solution were prepared by PEO. The effects of Nd(NO3)3 solution concentration on the microstructure and corrosion resistance of PEO coatings on magnesium alloys were investigated by means of scanning electron microscopy (SEM), X-ray diffractometer (XRD), and electrochemical workstation. It was found that the surface of the coatings was porous after PEO, and element Nd could be deposited on the surface of the coatings by pretreatment and existed in the PEO coatings. The coating formed at Nd(NO3)3 solution concentration of 0.06 mol/L exhibited the best corrosion resistance among all the as-prepared coatings.

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The n-MAO/EPD bio-ceramic composite coating fabricated on ZK60 magnesium alloy using combined micro-arc oxidation with electrophoretic deposition

Cited by 60 publications

References 40 publications

Microstructures and Properties of Laser Cladding Al-TiC-CeO2 Composite Coatings

Microstructures and Properties of Laser Cladding Al-TiC-CeO2 Composite Coatings

Corrosion protection of magnesium alloy by PEO-coatings containing sodium oleate

Microstructure and Corrosion Resistance of PEO Coatings Formed on KBM10 Mg Alloy Pretreated with Nd(NO3)3

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