Oxidation kinetics of Cr-coated zirconium alloy: Effect of coating thickness and microstructure

E. B. Kashkarov, D. V. Sidelev, M. S. Syrtanov, C. Tang, M. Steinbrück

Research output: Contribution to journalArticle

Abstract

Cr coatings with the thickness of 4.5–9.0 μm and dense/columnar microstructure were deposited onto Zr alloy by cooled or hot target magnetron sputtering. Steam oxidation tests were performed under temperature ramp from 500 to 1200 °C and isothermal treatment at 900−1200 °C for 10−30 min. The measurements of mass gain showed different oxidation kinetics depending on microstructure and thickness of the as-deposited Cr coatings. The dense microstructure is favorable to prevent alloy oxidation as long as the Cr layer is intact. The higher activation energy of 202 kJ/mol is observed for the dense 4.5 μm-thick Cr coating while thicker columnar coatings have 177−183 kJ/mol. The time of transition from protective to non-protective behavior increases with coating thickness. It was shown that the 9 μm-thick Cr coating with columnar microstructure better protects the zirconium alloy from oxidation at 1200 °C for 10 min in comparison with thinner coatings. The fast inter-diffusion of Cr and Zr at coating/alloy interface significantly affects the oxidation kinetics of Cr-coated zirconium alloy at temperatures above 1100 °C and long oxidation time.

Original languageEnglish
Article number108883
JournalCorrosion Science
Volume175
DOIs
Publication statusPublished - Oct 2020

Keywords

  • Chromium coatings
  • Hot target sputtering
  • LOCA
  • Magnetron sputtering
  • Microstructure
  • Steam oxidation
  • Zirconium alloys

ASJC Scopus subject areas

  • Chemistry(all)
  • Chemical Engineering(all)
  • Materials Science(all)

Fingerprint Dive into the research topics of 'Oxidation kinetics of Cr-coated zirconium alloy: Effect of coating thickness and microstructure'. Together they form a unique fingerprint.

  • Cite this