A new double-layer sol–gel coating to improve the corrosion resistance of a medical-grade stainless steel in a simulated body fluid

2013 ◽  
Vol 97 ◽  
pp. 162-165 ◽  
Author(s):  
E. Salahinejad ◽  
M.J. Hadianfard ◽  
D.D. Macdonald ◽  
M. Mozafari ◽  
D. Vashaee ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Simulated Body Fluid ◽  
Double Layer ◽  
Body Fluid ◽  
Sol Gel ◽  
Medical Grade

In Vitro Apatite-Forming Ability of Titania Films Depends on Their Substrates

2007 ◽  
Vol 330-332 ◽  
pp. 633-636 ◽  
Author(s):  
T. Shozui ◽  
Kanji Tsuru ◽  
Satoshi Hayakawa ◽  
Akiyoshi Osaka
Keyword(s):  
Stainless Steel ◽  
Titanium Alloy ◽  
Simulated Body Fluid ◽  
Physical Properties ◽  
Silicon Wafer ◽  
Body Fluid ◽  
Sol Gel ◽  
Glass Slide ◽  
Titania Films

Titania films were coated by means of sol-gel method on various substrates such as titanium, titanium alloy, silicon wafer, stainless-steel, alumina, and glass slide where they coded as C5Ti, C5Ti6Al4V, C5Si, C5SUS, C5Al2O3 and C5GS, respectively. Their in vitro apatite-forming ability was examined with the Kokubo’s simulated body fluid (SBF; pH 7.4, 36.5°C). C5Ti, C5Ti6Al4V and C5Si deposited apatite particles on their surface within 7 days, whereas, C5SUS, C5Al2O3 and C5GS did not. These results implied that the in vitro apatite-forming ability of the titania films indirectly depended on the chemical or physical properties of the substrates.

scholarly journals A study on corrosion resistance of ISO 5832-1 austenitic stainless steel used as orthopedic implant

2021 ◽  
Vol 3 (2) ◽  
Author(s):  
Lilian N. M. Braguin ◽  
Caio A. J. da Silva ◽  
Larissa O. Berbel ◽  
Isolda Costa ◽  
Mitiko Saiki
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Austenitic Stainless Steel ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Chemical Elements ◽  
Simulated Body Fluid Solution ◽  
Orthopedic Implants ◽  
Localized Corrosion ◽  
Electrochemical Tests

The ISO 5832-1 austenitic stainless steel used as biomaterial is largely applied in the area of orthopedics, especially in the manufacture of implants, such as temporary or permanent replacement of bone structures. The objective of this study was to evaluate the localized corrosion resistance of the ISO 5832-1 stainless steel used in orthopedic implants by electrochemical tests in two different solutions. The results of this study are of great interest to evaluate the corrosion of metallic implants that can result in the release of corrosion products into bodily fluids causing possible adverse biological reactions. The determination of the chemical elements in the composition of the ISO 5832-1 stainless steel was performed by neutron activation analysis (NAA). The samples for electrochemical tests were grinded with silicon carbide paper up to #4000 finishing, followed by mechanical polishing with diamond paste. The open circuit potential measurements and anodic polarization curves were obtained in solution of 0.90 wt. % of NaCl and of simulated body fluid (SBF). The results indicated that the ISO 5832-1 stainless steel presented a high resistance to crevice corrosion in simulated body fluid solution but high susceptibility to this form of corrosion in the chloride solution.  

Electrochemical behaviour of some commercial stainless steel alloys in simulated body fluid electrolytes

2021 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
A. Bahrawy ◽  
Mohamed El-Rabiei ◽  
Hesham Elfiky ◽  
Nady Elsayed ◽  
Mohammed Arafa ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Simulated Body Fluid ◽  
Body Fluid ◽  
Electrochemical Behaviour ◽  
Protective Oxide ◽  
Steel Alloys ◽  
Content Type ◽  
X Ray ◽  
Protective Oxide Film

Purpose The commercial stainless steels have been used extensively in the biomedicine application and their electrochemical behaviour in the simulated body fluid (SBF) are not uncovered obviously. In this research, the corrosion resistance of the commercial stainless steel of Fe–17Cr–xNi alloys (x = 4, 8, 10 and 14) has been studied. This study aims to evaluate the rate of corrosion and corrosion resistance of some Fe–Cr–Ni alloys in SBF at 37°C. Design/methodology/approach In this research, the corrosion resistance of the commercial stainless steel of Fe–17Cr–xNi alloys has been studied using open circuit potential, electrochemical impedance spectroscopy and potentiodynamic polarization in the SBF at 37°C and pH 7.4 for a week. Also, the surface morphology of the four alloys was investigated using scanning electron microscopy, elemental composition was obtained via energy dispersive spectroscopy and the crystal lattice structure of Fe–17Cr–xNi alloys was obtained using X-ray diffraction technique. The chemical structure of the protective oxide film has been examined by X-ray photoelectron spectroscopy (XPS) and metals ions released into the solution have been detected after different immersion time using atomic absorption spectroscopy. Findings The results revealed that the increase of the Ni content leads to the formation of the stable protective film on the alloys such as the Fe–17Cr–10Ni and Fe–17Cr–14Ni alloys which possess solid solution properties. The Fe–17Cr–14Ni alloy displayed highest resistance of corrosion, notable resistance for localized corrosion and the low corrosion rate in SBF because of the formation of a homogenously protective oxide film on the surface. The XPS analysis showed that the elemental Fe, Cr and Ni react with the electrolyte medium and the passive film is mainly composed of Cr2O3 with some amounts of Fe(II) hydroxide at pH 7.4. Originality/value This work includes important investigation to use commercial stainless steel alloys for biomedical application.

scholarly journals Development of Adhesive, Bioactive and Antibacterial Titania Sol-Gel Coating on Titanium Substrate by Dip-Coating Technique

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 243
Author(s):  
Diana Horkavcová ◽  
Quentin Doubet ◽  
Gisèle Laure Lecomte-Nana ◽  
Eva Jablonská ◽  
Aleš Helebrant
Keyword(s):  
Simulated Body Fluid ◽  
Body Fluid ◽  
Sol Gel ◽  
Titanium Substrate ◽  
Dip Coating ◽  
Coating Technique ◽  
Metal Implants ◽  
Excellent Adhesion ◽  
Titania Sol ◽  
Dip Coating Technique

The sol-gel method provides a wide variety of applications in the medical field. One of these applications is the formation of coatings on the metal implants. The coatings containing specific additive can enhance or improve the existing surface properties of the substrate. In this work, titania sol-gel coatings were doped with two forms of silver (AgNO3, Ag3PO4) and synthetic hydroxyapatite and applied on the titanium samples by dip-coating technique. After drying and slow firing, all coatings were characterized with scanning electron microscopy. Thin coatings were successfully prepared with excellent adhesion to the substrate (measured by ASTM D 3359-2), despite cracks. Coatings containing silver and hydroxyapatite demonstrated a 100% antibacterial effect against Escherichia coli after 24 h. The bioactivity of the coatings containing hydroxyapatite tested in modified simulated body fluid under static-dynamic conditions was confirmed by bone-like hydroxyapatite precipitation. To better understand the interaction of the coatings with simulated body fluid (SBF), changes of Ca2+ and (PO4)3− ions concentrations and pH values were studied.

Fabrication of Bioactive Stainless Steel by the Function of Apatite Nuclei

2016 ◽  
Vol 696 ◽  
pp. 151-156 ◽  
Author(s):  
Takeshi Yabutsuka ◽  
Ryoki Karashima ◽  
Shigeomi Takai ◽  
Takeshi Yao
Keyword(s):  
Stainless Steel ◽  
Simulated Body Fluid ◽  
Bonding Strength ◽  
Body Fluid ◽  
Apatite Layer ◽  
Mechanical Interlocking ◽  
High Bonding Strength ◽  
Fluid Formation ◽  
Bonelike Apatite

Micropores were formed on the surfaces of stainless steel (SUS) by sandblasting methods and Apatite Nuclei (AN) were formed in the pores. By this treatments, a bioactive SUS was fabricated. Apatite-forming ability of the SUS was evaluated by immersing in an acellular simulated body fluid. Formation of bonelike apatite was induced on the surface of the SUS within 1 day. High bonding strength of the bonelike apatite layer was achieved by a mechanical interlocking effect between the bonelike apatite formed in the pores and the SUS specimen.

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