Effects of three sealing methods of aluminum phosphate sealant on corrosion resistance of the Fe-based amorphous coating
By Liu, M. M.; Hu, H. X.; Zheng, Y. G.
Published in Surface and Coatings Technology
NULL
2017
Abstract
Abstract Porosity defects inevitably existed in the high-velocity oxy-fuel (HVOF)-sprayed Fe-based amorphous coatings, which directly affected the service lives of the coatings. Thus, sealing treatment became a key method to improve the coatings' corrosion resistance and prolong their service lives. In this study, three sealing technologies including conventional impregnation sealing (CIS), ultrasonic excitation sealing (UES) and vacuum sealing (VS) were employed to seal the HVOF-sprayed Fe-based amorphous coatings with aluminum phosphate. The sealing effect and corrosion behaviour of these coatings were investigated by scanning electron microscopy (SEM), electron probe micro-analyzer (EPMA) and electrochemical techniques. The results revealed that the aluminum phosphate sealant could block the structural defects of the coatings by forming a barrier layer which consisted of Al(PO3)3, H2(AlP3O10)
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