The Effect of Ni Content on the Corrosion Resistance of Some Fe–Cr–Ni Alloys in Simulated Body Fluids in the Presence of H2O2 and Albumin

This article reports the mechanical and biocorrosion behaviour of hollow silica nanosphere (SiO2) reinforced (0.5–2 vol.%) magnesium (Mg) syntactic foams. Room temperature tensile properties’ characterization suggests that the increased addition of hollow silica nanospheres resulted in a progressive increase in tensile yield strength (TYS) and ultimate tensile strength (UTS) with Mg-2 vol.% SiO2 exhibiting a maximum TYS of 167 MPa and a UTS of 217 MPa. The degradation behaviour of the developed Mg-SiO2 syntactic foams in four different simulated body fluids (SBFs): artificial blood plasma solution (ABPS), phosphate-buffered saline solution (PBS), artificial saliva solution (ASS) and Hanks’ balanced saline solution (HBSS) was investigated by using potentiodynamic polarization studies. Results indicate that corrosion resistance of the Mg-SiO2 syntactic foam decreases with increasing chloride ion concentration of the SBF. Mg-1.0 vol.% SiO2 displayed the best corrosion response and its corrosion susceptibility pertaining to corrosion rate and polarisation curves in different SBF solutions can be ranked in the following order: ABPS > PBS > HBSS > ASS. The surface microstructure demonstrated the presence of a better passivated layer on the syntactic foams compared to pure Mg. The observed increase in corrosion resistance is correlated with intrinsic changes in microstructure due to the presence of hollow silica nanospheres. Further, the effect of corrosive environment on the degradation behaviour of Mg has been elucidated.

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Surface analysis and corrosion resistance of a new titanium base alloy in simulated body fluids

Corrosion Science ◽

10.1016/j.corsci.2012.08.042 ◽

2012 ◽

Vol 65 ◽

pp. 431-440 ◽

Cited By ~ 75

Author(s):

C. Vasilescu ◽

S.I. Drob ◽

E.I. Neacsu ◽

J.C. Mirza Rosca

Keyword(s):

Corrosion Resistance ◽

Surface Analysis ◽

Base Alloy ◽

Body Fluids ◽

Simulated Body Fluids

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Corrosion Behaviour of Ti-6Al-4V Alloy with Nitride Coatings in Simulated Body Fluids at 36∘C and 40∘C

ISRN Corrosion ◽

10.1155/2013/241830 ◽

2013 ◽

Vol 2013 ◽

pp. 1-7 ◽

Cited By ~ 3

Author(s):

I. M. Pohrelyuk ◽

O. V. Tkachuk ◽

R. V. Proskurnyak

Keyword(s):

Corrosion Resistance ◽

Corrosion Behaviour ◽

Electrochemical Behaviour ◽

Body Fluids ◽

Nitride Coating ◽

Nitride Coatings ◽

Simulated Body Fluids

Nitride coatings were formed on Ti-6Al-4V alloy by thermodiffusion treatment. The corrosion-electrochemical behaviour of Ti-6Al-4V alloy with nitride coatings I and II was investigated in physiological solutions (0.9% NaCl and Tyrode's) at temperatures of 36∘C and 40∘C. It is determined that nitride coating I provides Ti-6Al-4V alloy the higher corrosion resistance in Tyrode's solution at both temperatures of solution while nitride coating II in isotonic 0.9% NaCl.

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The Influence of Passivation Type on Corrosion Resistance of Ti15Mo Alloy in Simulated Body Fluids / Wpływ Rodzaju Pasywacji Powierzchni Stopu Ti15Mo Na Jego Odporność Korozyjną W Środowisku Płynów Ustrojowych

Archives of Metallurgy and Materials ◽

10.1515/amm-2015-0433 ◽

2015 ◽

Vol 60 (4) ◽

pp. 2687-2694 ◽

Cited By ~ 6

Author(s):

M. Szklarska ◽

G. Dercz ◽

J. Rak ◽

W. Simka ◽

B. Łosiewicz

Keyword(s):

Corrosion Resistance ◽

Pitting Corrosion ◽

Surface Passivation ◽

Electrochemical Impedance ◽

Body Fluids ◽

Open Circuit ◽

Alloy Surface ◽

Nacl Solution ◽

Simulated Body Fluids ◽

Electrochemical Passivation

This work reports on determination of the influence of passivation type of Ti15wt.%Mo implant alloy surface on its corrosion resistance in simulated body fluids. The alloy under investigation was subjected to natural self-passivation in air, and forced passivation by autoclaving in steam, boiling in 30 % solution of H2O2, and electrochemical passivation in 0.9 % NaCl solution. Resistance of the passivated Ti15Mo alloy to pitting corrosion was studied at 37ºC in 0.9 % NaCl solution using open circuit potential method, anodic polarization curves, and electrochemical impedance spectroscopy (EIS). Comparative estimation of the determined parameters of corrosion resistance revealed that the obtained passive layers improve anticorrosive properties of the tested alloy. Surface of the alloy subjected to passivation in steam autoclave reveals the highest protection against pitting corrosion. Anodic potentiodynamic curves showed that the Ti15Mo alloy after different passivation types of the surface is characterized by a lack of susceptibility to pitting corrosion up to potential of 9 V. Based on the EIS investigations, the thickness of the formed oxide layers (TiO2, anatase) was determined to be in the range from 2.0 to 7.8 nm in dependence on the applied type of passivation. It was ascertained that electrochemical properties of the Ti15Mo alloy and possibility of its surface passivation using simple methods, make it an attractive material for use in biomedicine for long-term implants.

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Microstructures of Ti-1.5 w/o Ni Alloys with Mo and A1 Additions

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100113895 ◽

1975 ◽

Vol 33 ◽

pp. 54-55

Author(s):

Anna C. Fraker

Keyword(s):

Corrosion Resistance ◽

Beneficial Effect ◽

Crevice Corrosion ◽

Local Corrosion ◽

Precipitate Size ◽

Ni Alloys

Small amounts of nickel are added to titanium to improve the crevice corrosion resistance but this results in an alloy which has sheet fabrication difficulties and is subject to the formation of large Ti2Ni precipitates. These large precipitates can serve as local corrosion sites; but in a smaller more widely dispersed form, they can have a beneficial effect on crevice corrosion resistance. The purpose of the present work is to show that the addition of a small amount of Mo to the Ti-1.5Ni alloy reduces the Ti2Ni precipitate size and produces a more elongated grained microstructure. It has recently been reported that small additions of Mo to Ti-0.8 to lw/o Ni alloys produce good crevice corrosion resistance and improved fabrication properties.

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