Actes du 3ème Colloque International sur la Corrosion et la Protection des Matériaux à Haute Température
J. Phys. IV France 03 (1993) C9-901-C9-908
Automatic evaluation of the performance of corrosion resistant LCVD silica coatingsJ. Pou1, S.J. Spencer2, E. García1, D. Fernández1, P. González1, B. León1, S.R.J. Saunders2 and M. Pérez-Amor1
1 University of Vigo, Depto. Física Aplicada, Aptdo 62, 36280 Vigo, Spain
2 National Physical Laboratory, Queens Road, Teddington Middlesex, TW11 0LW, U.K.
A new method for the automatic evaluation of the corrosion resistance of coatings is described which is based on automatic feature detection combined with chemical classification (AFDCC) using an X-ray microanalysis system and scanning electron microscope. The results of this evaluation procedure are compared with conventional gravimetric analysis, and the AFDCC method is shown to have a number of advantages : i) greater sensitivity; ii) partially coated samples can be studied ; iii) coating defect growth rate can be monitored and iv) corrosion product characterisation is an integral part of the evaluation procedure. The combination of i) and ii) rise to a rapid method for optimising coating performance and can eliminate the need for long-term testing during the optimisation phase of coating development.
© EDP Sciences 1993