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Effects of three sealing methods of aluminum phosphate sealant on corrosion resistance of the Fe-based amorphous coating
Liu, M. M.; Hu, H. X.; Zheng, Y. G.; Hu, HX (reprint author), Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, 62 Wencui Rd, Shenyang 110016, Peoples R China.
2017-01-15
发表期刊SURFACE & COATINGS TECHNOLOGY
ISSN0257-8972
卷号309页码:579-589
摘要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), H-2(AlP3O10)center dot H2O, Al2P6O18 and AlPO4, independent of the sealing methods. The impedance values increased by one or two orders of magnitude compared with that of the unsealed coating indicating better corrosion resistance of the sealed coatings. Moreover, based on the long-term corrosion tests of the three sealed coatings, UES was the optimum sealing method. It was because that large amount of sealant was promoted to permeate into smaller cracks and holes and close the internal pores by ultrasonic energy. (C) 2016 Elsevier B.V. All rights reserved.; 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), H-2(AlP3O10)center dot H2O, Al2P6O18 and AlPO4, independent of the sealing methods. The impedance values increased by one or two orders of magnitude compared with that of the unsealed coating indicating better corrosion resistance of the sealed coatings. Moreover, based on the long-term corrosion tests of the three sealed coatings, UES was the optimum sealing method. It was because that large amount of sealant was promoted to permeate into smaller cracks and holes and close the internal pores by ultrasonic energy. (C) 2016 Elsevier B.V. All rights reserved.
部门归属[liu, m. m. ; hu, h. x. ; zheng, y. g.] chinese acad sci, inst met res, cas key lab nucl mat & safety assessment, 62 wencui rd, shenyang 110016, peoples r china ; [liu, m. m.] univ sci & technol china, sch mat sci & engn, hefei 230026, peoples r china
关键词Fe-based Amorphous Coatings Sealing Method Aluminum Phosphate Electrochemical Impedance Spectroscopy Ultrasonic Excitation Corrosion Resistance
学科领域Materials Science, Coatings & Films ; Physics, Applied
资助者National Natural Science Foundation of China [51571200, 51501206]
收录类别SCI
语种英语
文献类型期刊论文
条目标识符http://ir.imr.ac.cn/handle/321006/78339
专题中国科学院金属研究所
通讯作者Hu, HX (reprint author), Chinese Acad Sci, Inst Met Res, CAS Key Lab Nucl Mat & Safety Assessment, 62 Wencui Rd, Shenyang 110016, Peoples R China.
推荐引用方式
GB/T 7714
Liu, M. M.,Hu, H. X.,Zheng, Y. G.,et al. Effects of three sealing methods of aluminum phosphate sealant on corrosion resistance of the Fe-based amorphous coating[J]. SURFACE & COATINGS TECHNOLOGY,2017,309:579-589.
APA Liu, M. M.,Hu, H. X.,Zheng, Y. G.,&Hu, HX .(2017).Effects of three sealing methods of aluminum phosphate sealant on corrosion resistance of the Fe-based amorphous coating.SURFACE & COATINGS TECHNOLOGY,309,579-589.
MLA Liu, M. M.,et al."Effects of three sealing methods of aluminum phosphate sealant on corrosion resistance of the Fe-based amorphous coating".SURFACE & COATINGS TECHNOLOGY 309(2017):579-589.
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