Corrosion behavior of Fe25Mn6Si5Cr shape memory alloys modified with rare earth in a NaCl solution

2004 ◽  
Vol 39 (22) ◽  
pp. 6857-6859 ◽  
Author(s):  
Xing Huang ◽  
Shipu Chen ◽  
T. Y. Hsu ◽  
Xu Zuyao
Keyword(s):  
Rare Earth ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Corrosion Behavior ◽  
Nacl Solution

Influence of Titanium Additions on the Corrosion Behavior of Cu-Al-Ni Shape Memory Alloys

2021 ◽  
Vol 1021 ◽  
pp. 55-67
Author(s):  
Nawal Mohammed Dawood ◽  
Abdul Raheem Kadhim Abidali
Keyword(s):  
Corrosion Rate ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Corrosion Behavior ◽  
Sea Water ◽  
Base Alloy ◽  
Energy Dispersive Spectrometer ◽  
Rapid Quenching ◽  
Industrial Applications ◽  
Nacl Solution

The Cu- Al-Ni shape memory alloys have numerous industrial applications such as actuators, Cryofit hydraulic couplings, fire safety valves ,etc. while the parts that soaked in the sea water suffer severe corrosion that lead to worsening in the properties of the alloys. In the current research, the effect of adding titanium on corrosion behavior of the shape memory alloys (Cu-13wt. %Al-4wt. %Ni) were studied. Titanium was added in different weight ratios (0.4, 0.8, and 1.2 wt.%) to the base alloy. The alloys were prepared using powder metallurgy, whereby the alloys were sintered with two stages of heating under Argon atmosphere, at 550°C for (120 min.) and 950°C for (180 min.)respectively. All the sintered samples are solution treated by heating the samples at 900 °C for (60 min.) followed by rapid quenching in ice water at ( 3 ~ 6) °C. After that aging heat treatment has been done for quenched samples at 200 °C for (30 hrs.) followed by rapid quenching in iced water. Several tests such as microstructures observation and phase analysis using scanning electron microscope, energy dispersive spectrometer, and X-ray diffraction analysis have been done. Further , Corrosion behavior for all samples in aged conditions in 3.5%NaCl solution have been performed. Corrosion test results have showed that the highest corrosion resistance was found in the addition of (1.2 wt.% Ti) which give the lowest corrosion rate (0.003 mpy) in 3.5% NaCl solution . Noted that the corrosion rate of base alloy was (9.021)mpy. EDS analysis showed chemical composition of the aged surface and also mapping images for the distribution of Cu, Al, Ni, and Ti elements on the surface. Phases formed on aged samples conditions are α-Cu and AlCu3.

A comparative study on the corrosion behavior of porous and dense NiTi shape memory alloys in NaCl solution

2011 ◽  
Vol 56 (18) ◽  
pp. 6389-6396 ◽  
Author(s):  
X.T. Sun ◽  
Z.X. Kang ◽  
X.L. Zhang ◽  
H.J. Jiang ◽  
R.F. Guan ◽  
...  
Keyword(s):  
Comparative Study ◽  
Shape Memory Alloys ◽  
Shape Memory ◽  
Corrosion Behavior ◽  
Nacl Solution ◽  
Niti Shape Memory Alloys

scholarly journals Corrosion Behavior of Cu-Zn-Ni Shape Memory Alloys

2013 ◽  
Vol 01 (02) ◽  
pp. 49-54 ◽  
Author(s):  
S. Sathish ◽  
U. S. Mallik ◽  
T. N. Raju
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Corrosion Behavior

scholarly journals On the Influence of Microstructure on the Corrosion Behavior of Fe–Mn–Al–Ni Shape Memory Alloy in 5.0 wt% NaCl Solution

2020 ◽  
pp. 2000865 ◽  
Author(s):  
Johanna-Maria Frenck ◽  
Malte Vollmer ◽  
Marcel Mandel ◽  
Lutz Krüger ◽  
Thomas Niendorf
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Corrosion Behavior ◽  
Nacl Solution

The corrosion behavior of Fe-based shape memory alloys

2002 ◽  
Vol 44 (9) ◽  
pp. 2013-2026 ◽  
Author(s):  
H.C. Lin ◽  
K.M. Lin ◽  
C.S. Lin ◽  
T.M. Ouyang
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Corrosion Behavior

scholarly journals Electrochemical corrosion response of ZrN coated Nickel-Titanium alloy in 0.9% NaCl solution

2021 ◽  
Vol 9 (8) ◽  
pp. 2547-2552
Author(s):  
Kailash R. Jagdeo
Keyword(s):  
Shape Memory Alloys ◽  
Shape Memory ◽  
Biomedical Application ◽  
Electrochemical Corrosion ◽  
Nickel Titanium ◽  
Micro Hardness ◽  
Nacl Solution ◽  
Corrosion Stability ◽  
Vapor Deposition Technique ◽  
Cathodic Arc

Abstract: The biomedical application as metallic body implants of Nickel-Titanium shape memory alloys are of high interest due to its unique property of pseudo elasticity. However, high content of nickel and its potential to release from the surface due to corrosion raises safety concerns about its allergic reactions, toxicity and carcinogenicity. Hence, it is necessary to produce proper passivity to prevent surface layer degradation. In this study, ZrN coating on Nickel-Titanium shape memory alloys was obtained by vacuum cathodic arc physical vapor deposition technique to improve electrochemical corrosion resistance. The electrochemical corrosion response was studied in 0.9% NaCl solution at 370C using Tafel extrapolation method. Surface morphology was studied using SEM/EDAX and XRD. ZrN coating increases corrosion stability and micro hardness. Keywords: Shape memory alloy; pseudoelasticity; vacuum cathodic arc PVD; electrochemical corrosion; micro hardness.

Study on Corrosion Behavior of Ti-Ni-Nb Shape Memory Alloy and 1Cr18Ni9Ti Stainless Steel Aeroplane Pipe System

2013 ◽  
Vol 668 ◽  
pp. 808-813
Author(s):  
Jun Xiu Shi ◽  
Jian Hua Liu
Keyword(s):  
Shape Memory Alloy ◽  
Shape Memory ◽  
Corrosion Behavior ◽  
Galvanic Corrosion ◽  
Corrosion Current ◽  
Optical Microscope ◽  
Nacl Solution ◽  
Corrosion Morphology ◽  
Pipe System ◽  
Pipe Coupling

The susceptibility to stress corrosion cracking (SCC) and galvanic corrosion of an aeroplane pipe made of 1Cr18Ni9Ti connected with a pipe coupling that made of Ti-Ni-Nb shape memory alloy were evaluated. SCC test was completed under simulated service environment in 6% NaCl solution through a self-designed corrosive system. Galvanic corrosion behavior of Ti-Ni-Nb/1Cr18Ni9Ti couple was conducted in 3.5% NaCl solution at 30°C, in which galvanic corrosion current (Ig) and galvanic corrosion potential (Eg) were monitored. The corrosion morphology was observed by using scanning electronic microscope (SEM) and optical microscope (OM) after SCC test and galvanic test. It was showed that no obvious corrosion was detected on the surface of the whole pipe system after the simulated test. The two metals showed excellent resistance to SCC based on the section morphology observation. The average galvanic corrosion current of 1Cr18Ni9Ti/Ti-Ni-Nb couple was 0.13µA/cm2. No obvious corrosion pitting was detected on the surface of the two alloys by OM observation. Therefore, 1Cr18Ni9Ti pipe was safely connected with Ti-Ni-Nb pipe coupling in aeroplane pipe system.

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