Publication detail

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

ALIASGHARI, S. NĚMCOVÁ, A. ČÍŽEK, J. GHOLINIA, A. SKELDON, P. THOMPSON, G.

English title

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

Type

journal article in Web of Science

Language

en

Original abstract

The effect of reagent purity on AC plasma electrolytic oxidation of titanium in aluminate–phosphate-based 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, alpha-Al2O3 and gamma-Al2O3, with an aluminium-enriched outer region and phosphorus-enriched 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.

English abstract

The effect of reagent purity on AC plasma electrolytic oxidation of titanium in aluminate–phosphate-based 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, alpha-Al2O3 and gamma-Al2O3, with an aluminium-enriched outer region and phosphorus-enriched 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.

Keywords in English

Titanium, Plasma electrolytic oxidation, Electron microscopy

Released

08.03.2016

Publisher

Taylor & Francis

Location

United Kingdom

ISSN

0020-2967

Volume

94

Number

1

Pages from–to

32–42

Pages count

11

BIBTEX


@article{BUT122852,
  author="Sepideh {Aliasghari} and Aneta {Němcová} and Jan {Čížek} and Ali {Gholinia} and Peter {Skeldon} and George {Thompson},
  title="Effects of reagent purity on plasma electrolytic oxidation of titanium in an aluminate–phosphate electrolyte",
  year="2016",
  volume="94",
  number="1",
  month="March",
  pages="32--42",
  publisher="Taylor & Francis",
  address="United Kingdom",
  issn="0020-2967"
}