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Corrosion Behavior of an Abradable Seal Coating System
Alternative TitleJ. Therm. Spray Technol.
Zhang, Feng1,2; Xu, Cunguan3; Lan, Hao1; Huang, Chuanbing1; Zhou, Yang1; Du, Lingzhong1; Zhang, Weigang1
2014-08-01
Source PublicationJOURNAL OF THERMAL SPRAY TECHNOLOGY
ISSN1059-9630
Volume23Issue:6Pages:1019-1028
AbstractA novel NiTi/BN composite abradable coating and two traditional Ni/C and Ni/BN coatings were manufactured with NiAl as the bond layer using thermal spray technology and their corrosion behaviors were investigated. In salt spray corrosion testing of the Ni/BN coating, defective sites of the metal matrix were corroded preferentially. Simulated occlusion experiments and electrochemical tests indicated that migration of ions resulted in pH decrease and Cl- enrichment in defects, and a more aggressive electrolyte led to a decrease of the corrosion potential of the metal inside defects but an increase of the corrosion current density, representing an autocatalytic corrosion process. Moreover, galvanic corrosion between the top and bond coatings of the abradable system was studied via the electrochemical technique. The results showed that, for the NiTi/BN, Ni/BN, and Ni/graphite coatings with a NiAl bond coating, current flow was generated between the anode and cathode. The NiTi/BN coating acted as the cathode due to its passivation, while the Ni/BN and Ni/graphite coatings acted as the anode because of their lower corrosion potential compared with the NiAl coating. The anode suffered serious corrosion damage due to galvanic corrosion, while the cathode corroded only slightly.; A novel NiTi/BN composite abradable coating and two traditional Ni/C and Ni/BN coatings were manufactured with NiAl as the bond layer using thermal spray technology and their corrosion behaviors were investigated. In salt spray corrosion testing of the Ni/BN coating, defective sites of the metal matrix were corroded preferentially. Simulated occlusion experiments and electrochemical tests indicated that migration of ions resulted in pH decrease and Cl- enrichment in defects, and a more aggressive electrolyte led to a decrease of the corrosion potential of the metal inside defects but an increase of the corrosion current density, representing an autocatalytic corrosion process. Moreover, galvanic corrosion between the top and bond coatings of the abradable system was studied via the electrochemical technique. The results showed that, for the NiTi/BN, Ni/BN, and Ni/graphite coatings with a NiAl bond coating, current flow was generated between the anode and cathode. The NiTi/BN coating acted as the cathode due to its passivation, while the Ni/BN and Ni/graphite coatings acted as the anode because of their lower corrosion potential compared with the NiAl coating. The anode suffered serious corrosion damage due to galvanic corrosion, while the cathode corroded only slightly.
KeywordAbradable Seal Coating Galvanic Corrosion Localized Corrosion Salt Spray Corrosion Thermal Spray
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
DOI10.1007/s11666-014-0115-0
URL查看原文
Indexed BySCI
Language英语
WOS KeywordELECTROCHEMICAL-BEHAVIOR ; LOCALIZED CORROSION ; GALVANIC CORROSION ; CHLORIDE SOLUTION ; STEEL ; NI ; ALLOY ; CELLS ; RESISTANCE ; MECHANISM
WOS Research AreaMaterials Science
WOS SubjectMaterials Science, Coatings & Films
WOS IDWOS:000339882100014
Citation statistics
Cited Times:6[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/11336
Collection研究所(批量导入)
Affiliation1.Chinese Acad Sci, State Key Lab Multiphase Complex Syst, Inst Proc Engn, Beijing 100049, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Shanghai Elect Power Generat Equipment Co Ltd, Shanghai Turbine Plant, Shanghai 200240, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Feng,Xu, Cunguan,Lan, Hao,et al. Corrosion Behavior of an Abradable Seal Coating System[J]. JOURNAL OF THERMAL SPRAY TECHNOLOGY,2014,23(6):1019-1028.
APA Zhang, Feng.,Xu, Cunguan.,Lan, Hao.,Huang, Chuanbing.,Zhou, Yang.,...&Zhang, Weigang.(2014).Corrosion Behavior of an Abradable Seal Coating System.JOURNAL OF THERMAL SPRAY TECHNOLOGY,23(6),1019-1028.
MLA Zhang, Feng,et al."Corrosion Behavior of an Abradable Seal Coating System".JOURNAL OF THERMAL SPRAY TECHNOLOGY 23.6(2014):1019-1028.
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