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Article: Corrosion products and mechanism on NiTi shape memory alloy in physiological environment

TitleCorrosion products and mechanism on NiTi shape memory alloy in physiological environment
Authors
KeywordsEngineering mechanics and materials physics
Corrosion behavior
Electrochemical measurements
Long-term immersions
Nickel concentrations
Issue Date2010
PublisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/jmr
Citation
Journal Of Materials Research, 2010, v. 25 n. 2, p. 350-358 How to Cite?
AbstractDespite many investigations on the corrosion behavior of NiTi shape memory alloys (SMAs) in various simulated physiological solutions by electrochemical measurements, few have reported detailed information on the corrosion products. In the present study, the structure and composition of the corrosion products on NiTi SMAs immersed in a 0.9% NaCl physiological solution are systematically investigated by scanning electron microscopy (SEM), x-ray energy dispersion spectroscopy (EDS), and x-ray photoelectron spectroscopy (XPS). It is found that attack by Cl - results in nickel being released into the solution and decrease in the local nickel concentration at the pitting sites. The remaining Ti reacts with dissolved oxygen from the solution to form titanium oxides. After longterm immersion, the corrosion product layer expands over the entire surface and XPS reveals that the layer is composed of TiO 2, Ti 2O3, and TiO with relatively depleted Ni. The growth rate of the corrosion product layer decreases with immersion time, and the corrosion product layer is believed to impede further corrosion and improve the biocompatibility of NiTi alloy in a physiological environment. It is found that the release rate of nickel is related to the surface structure of the corrosion product layer and immersion time. A corrosion mechanism is proposed to explain the observed results. © 2010 Materials Research Society.
Persistent Identifierhttp://hdl.handle.net/10722/137050
ISSN
2015 Impact Factor: 1.579
2015 SCImago Journal Rankings: 0.664
ISI Accession Number ID
Funding AgencyGrant Number
Hong Kong Research Grants Council (RGC) General Research Fund (GRF)CityU 112307
Funding Information:

The authors are grateful to Dr. Chenglong Liu, associate professor from Chongqing University of Technology, for his useful suggestions. Financial support from Hong Kong Research Grants Council (RGC) General Research Fund (GRF) No. CityU 112307 is acknowledged.

References

 

DC FieldValueLanguage
dc.contributor.authorHu, Ten_HK
dc.contributor.authorChu, Cen_HK
dc.contributor.authorXin, Yen_HK
dc.contributor.authorWu, Sen_HK
dc.contributor.authorYeung, KWKen_HK
dc.contributor.authorChu, PKen_HK
dc.date.accessioned2011-08-03T06:14:31Z-
dc.date.available2011-08-03T06:14:31Z-
dc.date.issued2010en_HK
dc.identifier.citationJournal Of Materials Research, 2010, v. 25 n. 2, p. 350-358en_HK
dc.identifier.issn0884-2914en_HK
dc.identifier.urihttp://hdl.handle.net/10722/137050-
dc.description.abstractDespite many investigations on the corrosion behavior of NiTi shape memory alloys (SMAs) in various simulated physiological solutions by electrochemical measurements, few have reported detailed information on the corrosion products. In the present study, the structure and composition of the corrosion products on NiTi SMAs immersed in a 0.9% NaCl physiological solution are systematically investigated by scanning electron microscopy (SEM), x-ray energy dispersion spectroscopy (EDS), and x-ray photoelectron spectroscopy (XPS). It is found that attack by Cl - results in nickel being released into the solution and decrease in the local nickel concentration at the pitting sites. The remaining Ti reacts with dissolved oxygen from the solution to form titanium oxides. After longterm immersion, the corrosion product layer expands over the entire surface and XPS reveals that the layer is composed of TiO 2, Ti 2O3, and TiO with relatively depleted Ni. The growth rate of the corrosion product layer decreases with immersion time, and the corrosion product layer is believed to impede further corrosion and improve the biocompatibility of NiTi alloy in a physiological environment. It is found that the release rate of nickel is related to the surface structure of the corrosion product layer and immersion time. A corrosion mechanism is proposed to explain the observed results. © 2010 Materials Research Society.en_HK
dc.languageeng-
dc.publisherMaterials Research Society. The Journal's web site is located at http://www.mrs.org/publications/jmren_HK
dc.relation.ispartofJournal of Materials Researchen_HK
dc.rightsCreative Commons: Attribution 3.0 Hong Kong License-
dc.rightsJournal of Materials Research. Copyright © Materials Research Society.-
dc.subjectEngineering mechanics and materials physics-
dc.subjectCorrosion behavior-
dc.subjectElectrochemical measurements-
dc.subjectLong-term immersions-
dc.subjectNickel concentrations-
dc.titleCorrosion products and mechanism on NiTi shape memory alloy in physiological environmenten_HK
dc.typeArticleen_HK
dc.identifier.openurlhttp://library.hku.hk:4550/resserv?sid=HKU:IR&issn=0884-2914&volume=25&issue=2&spage=350&epage=358&date=2010&atitle=Corrosion+products+and+mechanism+on+NiTi+shape+memory+alloy+in+physiological+environment-
dc.identifier.emailYeung, KWK:wkkyeung@hkucc.hku.hken_HK
dc.identifier.authorityYeung, KWK=rp00309en_HK
dc.description.naturepublished_or_final_versionen_US
dc.identifier.doi10.1557/jmr.2010.0051en_HK
dc.identifier.scopuseid_2-s2.0-77954174710en_HK
dc.identifier.hkuros172961-
dc.relation.referenceshttp://www.scopus.com/mlt/select.url?eid=2-s2.0-77954174710&selection=ref&src=s&origin=recordpageen_HK
dc.identifier.volume25en_HK
dc.identifier.issue2en_HK
dc.identifier.spage350en_HK
dc.identifier.epage358en_HK
dc.identifier.isiWOS:000274114400022-
dc.publisher.placeUnited Statesen_HK
dc.identifier.scopusauthoridHu, T=25948400300en_HK
dc.identifier.scopusauthoridChu, C=7404345713en_HK
dc.identifier.scopusauthoridXin, Y=16053620900en_HK
dc.identifier.scopusauthoridWu, S=15125218800en_HK
dc.identifier.scopusauthoridYeung, KWK=13309584700en_HK
dc.identifier.scopusauthoridChu, PK=36040705700en_HK

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