The erosion/corrosion properties of the advanced polymer composites, PMR-15, BMI (Matrimid 5292) and PMR-II-20 have been studied. Specimens of these materials were exposed to jets of an erosion/corrosion medium consisting of salt, iron oxide, quartz and coarse desert dust dispersed in water. The jets impinged on the specimens perpendicular to the plane of the reinforcements for a period of approximately 2 months. The velocity of the jets was measured to be 10 m s-r. The damaged surfaces were examined both visually and under a scanning electron microscope. Damage mechanisms which are associated with this phenomenon are identified. Matrix microcracking, matrix removal and blister formation are the principal damage mechanisms observed. Deep cuts, cutting lines and rust deposition are the main features of the damaged surface. It is observed that BMI matrix composites display a large amount of matrix removal and consequently, fibre exposure. A large amount of scales of deposits are also observed. On the other hand, PMR-15 shows cutting lines, with less matrix removal than BMI. Large scale deposits are also observed on the surface of PMR-15 composite. The PMR-II composite displays the least amount of matrix removal, with brittle matrix microcracking. Blister formation is a dominant corrosive feature of the PMR-II composite.
Посилання на статтю:
Behaviour of advanced polymer composites in erosive/corrosive environments / D. Mitramajumdar and H. Aglan* // Polymer. – 1992. – Vol 33. – P. 1855-1859.