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A preliminary study of the structure and the corrosion performance of plasma sprayed YSZ coatings

G. VOURLIAS1,* , N. PISTOFIDIS1, D. CHALIAMBALIAS1, I. TSIAOUSSIS1, G. STERGIOUDIS1, E. K. POLYCHRONIADIS1

Affiliation

  1. Physics Department, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece

Abstract

An important problem related with hot-dip galvanizing is the storage of liquid zinc, because steel is heavily corroded by the molten metal. To overcome this problem the ferrous containers are coated with ceramic materials. In the present work the structure and the corrosion performance of YSZ coatings on low carbon steel is examined. For that purpose coupons of steel St-37 were plasma sprayed with ZrO2-8%Y2O3. The structural characterization prior to corrosion took place with Scanning Electron Microscopy, X-Ray Diffraction and Transmission Electron Microscopy. Afterwards the as-coated samples were dipped in molten zinc at 450oC up to 120 hrs. The initial examination of the YSZ coatings showed that many pores are present in their mass, which, however, do not communicate with each other and as a result they do not facilitate zinc diffusion up to the substrate. Furthermore the coating is exclusively composed by YSZ with a little different stoichiometry (ZrO1.88-8%Y2O3) from the theoretical. No diffusion in the substrate took place and consequently the coating is only mechanically bonded to the substrate. For the corrosion study kinetic curves representing molten Zn attack on coated and uncoated carbon steel were drawn. From this data it turned out that YSZ coating are almost unaffected..

Keywords

Metals and alloys, Plasma spray, YSZ, Coating materials, X-ray diffraction, SEM, TEM.

Submitted at: Nov. 14, 2006
Accepted at: June 15, 2007

Citation

G. VOURLIAS, N. PISTOFIDIS, D. CHALIAMBALIAS, I. TSIAOUSSIS, G. STERGIOUDIS, E. K. POLYCHRONIADIS, A preliminary study of the structure and the corrosion performance of plasma sprayed YSZ coatings, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 6, pp. 1660-1664 (2007)