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Study of the structure and the corrosion performance of tin plasma sprayed coatings

G. VOURLIAS1,* , N. PISTOFIDIS1, G. STERGIOUDIS1, E. K. POLYCHRONIADIS1

Affiliation

  1. Physics Department, Aristotle University of Thessaloniki, 54 124 Thessaloniki, Greece

Abstract

Tin (Sn) is characterized by excellent corrosion resistance in aqueous environments at low temperature. Therefore this metal is used as a coating for iron. The usual method for the tin deposition is hot-dipping. However, this method, although it is very effective, it is not environmentally friendly. Consequently, alternative methods are investigated, one of which is plasma spraying. In the present work strips of steel St-37 were coated with tin (Sn) with plasma spraying. Initially their structure was studied with scanning electron microscopy (SEM), X-ray diffraction (XRD) and conventional transmission electron microscopy (CTEM). From this research it was deduced that the coating is mainly composed of tetragonal tin with very low porosity, while a tin oxide film is likely to cover its surface. Finally CTEM showed that Fe-Sn phases are formed. Afterwards the coatings were exposed in a salt spray chamber (SSC). The as-corroded samples were studied with optical microscopy, SEM and XRD and it was concluded that Sn and Fe oxides and chlorides were formed on the coating surface along with large cavities. A possible mechanism of internal oxidation (intergranular corrosion) was used to explain these observations, while an effort was made to correlate the coating structure with the corrosion results..

Keywords

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

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

Citation

G. VOURLIAS, N. PISTOFIDIS, G. STERGIOUDIS, E. K. POLYCHRONIADIS, Study of the structure and the corrosion performance of tin plasma sprayed coatings, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 5, pp. 1317-1321 (2007)