The effect of Nb additions on the passive behavior of NiTi shape memory alloys

被引：1
作者：
Cronemberger, M. E. R. [1 ]
Silva, R. [1 ,2 ]
Martins Junior, C. B. [1 ,2 ]
Vacchi, G. S. [1 ,2 ]
Gonzalez, E. D. [3 ]
Rovere, C. A. D. [1 ,2 ]
机构：
[1] Univ Fed Sao Carlos, Dept Mat Engn, Munir Rachid Corros Lab, Rodovia Washington Luis Km 235, BR-13565905 Sao Carlos, SP, Brazil
[2] Univ Fed Sao Carlos, Grad Program Mat Sci & Engn, Rodovia Washington Luis Km 235, BR-13565905 Sao Carlos, SP, Brazil
[3] Univ Valle, Escuela Ingn Mat EIMAT, Grp Tribol Polimeros Met Polvos & Transformac Resi, Cali 760001, Colombia
来源：
APPLIED SURFACE SCIENCE | 2025年 / 679卷
基金：
巴西圣保罗研究基金会;
关键词：
NiTi shape memory alloy; Nb addition; Microstructure; Localized corrosion; Passive film; XPS; POINT-DEFECT MODEL; CORROSION-RESISTANCE; MECHANICAL-PROPERTIES; MARTENSITIC-TRANSFORMATION; PHASE-TRANSFORMATION; WIDE HYSTERESIS; SURFACE CHARACTERIZATION; MICROSTRUCTURE; TITANIUM; NIOBIUM;
D O I：
10.1016/j.apsusc.2024.161244
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
This study explores the passivity and localized corrosion behavior of Ni(100-x)/2Ti(100-x)/2Nbx shape memory alloys (where x = 3, 6, and 9 at.%) through potentiodynamic and potentiostatic polarization tests in 3.5 wt% NaCl solution. The results reveal a significant dependence of the surface passive film's stability on the Nb concentration. Using X-ray photoelectron spectroscopy (XPS), the chemical composition of the passive films formed on the NiTiNb alloys was characterized. Microstructural analysis showed that increasing Nb content affects the volume fraction of the eutectic microconstituent, leading to the suppression of martensite and secondary Ni-Ti phases in the microstructure with higher Nb additions. The findings demonstrate that localized corrosion resistance improves with Nb additions, attributed to the incorporation of Nb2O5 into the TiO2 passive film, enhancing its protective capacity. Remarkably, the NiTi shape memory alloy exhibits immunity to localized corrosion when 9 at.% Nb is added.
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页数：12
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