Silicon effects on formation of EPO oxide coatings on aluminum alloys

Wang, L.; Nie, Xueyuan

doi:10.1016/j.tsf.2005.07.184

Cited by 61 publications

(54 citation statements)

References 13 publications

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“…Thus, beyond the critical coating thickness corresponding to the critical voltage (%50 lm), the adverse affect of Si is no longer present, leading to linear coating deposition kinetics. The results obtained in the present study are clearly in support of the above postulate of Wang et al [22] The six alloys other than Al-Si alloys exhibited linear coating deposition rates similar to that of pure Al. In a recent study carried out on the diagnostics of the MAO process, two growth regimes have been identified.…”

Section: A Coating Morphologysupporting

confidence: 92%

“…Silicon is electrochemically passive and possesses very low electrical conductivity, and thus the passivation layer forms via chemisorption thereby hindering the oxidation of Al substrate lying beneath the Si particles. [22] In accordance with the above explanation, increasing the Si content in Al should further reduce the oxidation kinetics. However, as can be inferred from Figure 2, as the applied voltage increases with increasing coating thickness and exceeds a critical voltage value, the passivity induced by Si appears to be negligible.…”

Section: A Coating Morphologysupporting

confidence: 62%

“…The influence of Si on the mechanism of coating formation and coating morphology has already been discussed elsewhere. [22] B. Coating Deposition Kinetics Figure 2 illustrates the increase in MAO coating thickness as a function of deposition time for commercial purity aluminum (CP-Al) in comparison with Al-4 pct Si, LM25 (Al-7.3 pct Si), and LM6 (Al-13 pct Si) alloy substrates.…”

Section: A Coating Morphologymentioning

confidence: 99%

“…[19] More recently, the influence of Si content on the formation mechanism of MAO coatings has been investigated by depositing thin coatings (<10 lm) on hypo-and hypereutectic Al-Si alloys. [22] Based on the voltage variation with treatment time, a four-stage process has been suggested. Although the c-Al 2 O 3 was found to be the major phase, the formation of mullite phase was also noticed.…”

Section: Introductionmentioning

confidence: 99%

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Kinetics and Properties of Micro Arc Oxidation Coatings Deposited on Commercial Al Alloys

Krishna

Purnima

Wasekar

et al. 2007

Metall Mater Trans A

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The micro arc oxidation (MAO) technique is being increasingly recognized as a novel and ecofriendly means of depositing dense ceramic oxide coatings on Al and its alloys. In the present study, the deposition kinetics, surface roughness, morphology, phase distribution and the microhardness of the MAO coatings deposited on ten different commercially available Al substrates having widely differing chemical composition has been investigated. Further, the tribological properties of the coatings obtained on different Al alloys in comparison with the bare substrates have also been evaluated using dry sand abrasion, solid-particle erosion and pinon-disc dry sliding wear tests. The results clearly demonstrate that the alloying elements added to the Al substrate substantially influence the MAO coating deposition kinetics and coating properties. In the case of Al-Si alloys, the coating deposition kinetics is non-linear and the Al 6 Si 2 O 13 (mullite) is observed to form. With increasing Si content, the corresponding mullite phase also increases. Increasing mullite content in the coating adversely affects the tribological performance. Excepting Al-Si alloys, all other alloys investigated including commercial purity Al exhibit linear coating deposition kinetics. Of all the alloys investigated, Al-Li alloy exhibits the highest coating deposition rate and the 6061 T6 Al alloy exhibits the best coating properties.

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Section: A Coating Morphologysupporting

confidence: 92%

Section: A Coating Morphologysupporting

confidence: 62%

Section: A Coating Morphologymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Kinetics and Properties of Micro Arc Oxidation Coatings Deposited on Commercial Al Alloys

Krishna

Purnima

Wasekar

et al. 2007

Metall Mater Trans A

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“…However, aluminum has to show better mechanical strength and resistance to high temperatures to be used in applications such as moving machine parts. Coating aluminum surface with hard ceramic is a way to increase these properties [1][2][3][4][5][6][7][8]. Ceramic materials have high hardness and high resistance to thermal and corrosive conditions.…”

Section: Introductionmentioning

confidence: 99%

Friction and Wear Properties of Plasma Sprayed YSZ/Ni-Cr-Al Coated 6063-T6 Aluminum Alloy

Erzi

Dışpınar

Yılmaz

2017

Archives of Foundry Engineering

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In this study T6 heat treated 6063 aluminum alloys were used as substrate material. In order to form a bond between the substrate and the main coating, all samples were coated with Ni-Cr-Al powders. 8 wt% Yttria Stabilized Zirconia powders (YSZ) were coated with plasma spray technique. Thickness of YSZ was 150 m and bond coating was 36 m. XRD and SEM-EDS analyses were performed to characterize the coating layers. These YSZ coated and uncoated samples were subjected to wear testing under different spindle speed, loading and working distance. Wear test results were compared with the kinetic friction coefficients and weight loss values. Wear marks on YSZ coated and uncoated samples were investigated by SEM analysis. By coating with plasma spray technique, the wear resistance of Al alloys was increased without changing the friction coefficient. It was found that spindle speed had significant effect over the wear properties than the load applied. By YSZ coating, wear properties were increased 10 times.

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