Effects of reagent purity on plasma electrolytic oxidation of titanium in an aluminate-phosphate electrolyte

S. Aliasghari; A. Němcova; J. Čížek; A. Gholinia; P. Skeldon; G. E. Thompson

doi:10.1080/00202967.2015.1121692

Effects of reagent purity on plasma electrolytic oxidation of titanium in an aluminate-phosphate electrolyte

S. Aliasghari, A. Němcova, J. Čížek, A. Gholinia, P. Skeldon, G. E. Thompson

Brno University of Technology

Research output: Contribution to journal › Article › peer-review

Abstract

The effect of reagent purity on AC plasma electrolytic oxidation of titanium in aluminate-phosphatebased electrolytes has been studied under constant rms current conditions. The resultant coatings were examined by high-resolution electron microscopy and X-ray diffraction, revealing rutile, Al₂TiO₅, α-Al₂O₃ and γ-Al₂O₃, with an aluminium-enriched outer region and phosphorusenriched band near the coating base. A lower purity of the electrolyte led to an erratic voltage response and delamination of coating material in scratch tests. A thin chlorine-enriched region near the substrate, attributed to the inward migration of chloride ions during coating growth, is suggested to be the cause of the delamination. Deliberate additions of chloride to the electrolyte resulted in highly porous coatings.

Original language	English
Pages (from-to)	32-42
Number of pages	11
Journal	Transactions of the Institute of Metal Finishing
Volume	94
Issue number	1
Early online date	8 Mar 2016
DOIs	https://doi.org/10.1080/00202967.2015.1121692
Publication status	Published - 8 Mar 2016

Keywords

Electron microscopy
Plasma electrolytic oxidation
Titanium

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10.1080/00202967.2015.1121692

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abstract = "The effect of reagent purity on AC plasma electrolytic oxidation of titanium in aluminate-phosphatebased electrolytes has been studied under constant rms current conditions. The resultant coatings were examined by high-resolution electron microscopy and X-ray diffraction, revealing rutile, Al2TiO5, α-Al2O3 and γ-Al2O3, with an aluminium-enriched outer region and phosphorusenriched band near the coating base. A lower purity of the electrolyte led to an erratic voltage response and delamination of coating material in scratch tests. A thin chlorine-enriched region near the substrate, attributed to the inward migration of chloride ions during coating growth, is suggested to be the cause of the delamination. Deliberate additions of chloride to the electrolyte resulted in highly porous coatings.",

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AU - Aliasghari, S.

AU - Němcova, A.

AU - Čížek, J.

AU - Gholinia, A.

AU - Skeldon, P.

AU - Thompson, G. E.

PY - 2016/3/8

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N2 - The effect of reagent purity on AC plasma electrolytic oxidation of titanium in aluminate-phosphatebased electrolytes has been studied under constant rms current conditions. The resultant coatings were examined by high-resolution electron microscopy and X-ray diffraction, revealing rutile, Al2TiO5, α-Al2O3 and γ-Al2O3, with an aluminium-enriched outer region and phosphorusenriched band near the coating base. A lower purity of the electrolyte led to an erratic voltage response and delamination of coating material in scratch tests. A thin chlorine-enriched region near the substrate, attributed to the inward migration of chloride ions during coating growth, is suggested to be the cause of the delamination. Deliberate additions of chloride to the electrolyte resulted in highly porous coatings.

AB - The effect of reagent purity on AC plasma electrolytic oxidation of titanium in aluminate-phosphatebased electrolytes has been studied under constant rms current conditions. The resultant coatings were examined by high-resolution electron microscopy and X-ray diffraction, revealing rutile, Al2TiO5, α-Al2O3 and γ-Al2O3, with an aluminium-enriched outer region and phosphorusenriched band near the coating base. A lower purity of the electrolyte led to an erratic voltage response and delamination of coating material in scratch tests. A thin chlorine-enriched region near the substrate, attributed to the inward migration of chloride ions during coating growth, is suggested to be the cause of the delamination. Deliberate additions of chloride to the electrolyte resulted in highly porous coatings.

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KW - Plasma electrolytic oxidation

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Effects of reagent purity on plasma electrolytic oxidation of titanium in an aluminate-phosphate electrolyte

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Keywords

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