scholarly journals Corrosion Behaviour of a Highly Alloyed Austenitic Alloy UB6 in Contaminated Phosphoric Acid

2013 ◽  
Vol 2013 ◽  
pp. 1-9 ◽  
Author(s):  
M. Boudalia ◽  
A. Guenbour ◽  
A. Bellaouchou ◽  
R. M. Fernandez-Domene ◽  
J. Garcia-Anton
Keyword(s):  
Stainless Steel ◽  
Phosphoric Acid ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Electrochemical Behaviour ◽  
Phosphoric Acid Solution ◽  
Flat Band ◽  
Potential Range ◽  
Potentiodynamic Curves ◽  
P Type

The influence of temperature (20–80°C) on the electrochemical behaviour of passive films anodically formed on UB6 stainless steel in phosphoric acid solution (5.5 M H3PO4) has been examined by using potentiodynamic curves, electrochemical impedance spectroscopy, and Mott-Schottky analysis. UB6 stainless steel in contaminated phosphoric acid is characterised by high interfacial impedance, thereby, illustrating its high corrosion resistance. The obtained results show that the films behave as n-type and p-type semiconductors in the potential range above and below the flat band potential, respectively. This behaviour is assumed to be the consequence of the semiconducting properties of the iron oxide and chromium oxide regions which compose the passive film.

Effect of Temperature on Electrochemical Behavior of Stainless Steel in Phosphoric Acid

2013 ◽  
Vol 351-352 ◽  
pp. 1072-1076 ◽  
Author(s):  
Wen Shi ◽  
Song Xiang ◽  
Yan Li Li ◽  
Ming Yang ◽  
Ya Nan Hu ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Phosphoric Acid ◽  
Acid Solution ◽  
Electrochemical Behavior ◽  
Electrochemical Impedance ◽  
Corrosion Current ◽  
Phosphoric Acid Solution ◽  
Effect Of Temperature ◽  
Solution Temperature ◽  
304L Stainless Steel

Electrochemical behavior of 304L and S32304 stainless steel in different temperature and concentration phosphoric acid solution by means of polarization curve and electrochemical impedance spectroscopy. The results showed that with the increase of the phosphoric acid solution temperature, the corrosion voltage and the corrosion current of the stainless steel increase and the polarization resistance and solution resistance decrease. The corrosion-resistant properties of S32304 stainless steel are superior to that of 304L stainless steel.

Low velocity oxy fuel spraying of hydroxyapatite coating on a multifunctional UNS S31254 austenitic stainless steel

2021 ◽  
pp. 095441192110157
Author(s):  
Srikant Tiwari ◽  
Suryanarayan B Mishra
Keyword(s):  
Stainless Steel ◽  
Calcium Phosphate ◽  
Austenitic Stainless Steel ◽  
Bacterial Adhesion ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Steel Substrate ◽  
The Body ◽  
Low Velocity ◽  
Uncoated Steel

Artificial material such as stainless steel (SS) is widely used for orthopaedic applications owing to its superior properties, ease of fabrication and lower cost. However, in the body environment, stainless steel can leach toxic elements such as nickel and chromium. To prevent this, a hydroxyapatite (HAp) coating having chemical characteristics very similar to the human bone was deposited on a medical-grade UNS S31254 austenitic stainless steel by a Low-velocity oxy-fuel spray gun (LVOF). The coating was characterised by using a field emission scanning electron microscope (FESEM), X-ray diffractometer (XRD) and Fourier transform infrared spectroscope (FTIR). The adhesion strength, microhardness and corrosion behaviour were studied using the Tensometre, Vickers microhardness tester and potentiodynamic polarisation with electrochemical impedance spectroscope. The bacterial adhesion and bioactivity of the coating were also evaluated. The LVOF sprayed HAp coating has shown better corrosion resistance, higher bioactivity and higher hardness than the uncoated steel. The presence of tricalcium phosphate, octa-calcium phosphate (OCP) and tetra-calcium phosphate (TTCP) was found in the coating. LVOF sprayed HAp coating is also found suitable in lowering the bacterial adhesion on the steel substrate.

scholarly journals Mechanical and Electrochemical Characterization of Supersolidus Sintered Austenitic Stainless Steel (316 L)

2019 ◽  
Vol 38 (2019) ◽  
pp. 792-805 ◽  
Author(s):  
S. Ramakrishna Kandala ◽  
Kantesh Balani ◽  
Anish Upadhyaya
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Electrochemical Impedance ◽  
Rupture Strength ◽  
Electrochemical Behaviour ◽  
Compaction Pressure ◽  
316 L Stainless Steel ◽  
Aisi 316 ◽  
Stainless Steel 316 ◽  
Aisi 316 L

AbstractThe present study compares the mechanical properties and electrochemical behaviour of austenitic (AISI 316 L) stainless steel compacted at different pressures (200, 400 and 600 MPa), which are conventionally sintered at supersolidus temperature of 1,400°C. As expected, increase in compaction pressure (from 200 MPa) to 600 MPa has shown decreased shrinkage (from 7.3% to 4.2% radial and 5.5% to 3.4% axial, respectively) and increased densification (up to ~92%). Their electrochemical behaviour was investigated in 0.1 N H2SO4 solution by potentiodynamic polarization and electrochemical impedance spectroscopy. The mechanical properties (such as yield-, tensile- and transverse rupture strength) and electrochemical behaviour with pressure have been correlated with densification response and microstructure (pore type, volume and morphology). Highest densification (~92% theoretical) achieved at 600 MPa (compaction pressure) and 1,400°C (sintering temperature) resulted in excellent combination of tensile strength and ductility (456 ± 40 MPa and 25 ± 1.1% respectively), while showing lowest corrosion rate (0.1 mmpy or 4.7 mpy) due to the presence of isolated porosity in the sintered samples.

Mechanical and Electrochemical Characterization of Super-Solidus Sintered Austenitic Stainless Steel (316L)

2016 ◽  
Vol 35 (7) ◽  
pp. 643-651 ◽  
Author(s):  
A. Muthuchamy ◽  
A. Raja Annamalai ◽  
Rishabh Ranka
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Electrochemical Impedance ◽  
Electrochemical Behaviour ◽  
Compaction Pressure ◽  
Solidus Temperature ◽  
Stainless Steel 316L ◽  
Aisi 316L Stainless Steel ◽  
Strength And Ductility

AbstractThe present study compares the mechanical and electrochemical behaviour of austenitic (AISI 316L) stainless steel compacted at various pressures (200, 400 and 600 MPa) and conventionally sintered at super-solidus temperature of 1,400°C. The electrochemical behaviour was investigated in 0.1 N H2SO4 solution by potentiodynamic polarization and electrochemical impedance spectroscopy (EIS). The shrinkage decreased and densification has been increased with increasing pressure. The mechanical and electrochemical behaviour with pressure has been correlated with densification response and microstructure (pore type, volume and morphology). Highest densification (~92% theoretical) achieved at 600 MPa (compaction pressure) and 1,400°C (sintering temperature) resulted in excellent combination of tensile strength and ductility (456 ± 40 MPa, 25 ± 1.1%), while showing excellent corrosion resistance (0.1 mmpy or 4.7 mpy).

scholarly journals Corrosion Behaviour of a New Low-Nickel Stainless Steel Reinforcement: A Study in Simulated Pore Solutions and in Fly Ash Mortars

2012 ◽  
Vol 2012 ◽  
pp. 1-8 ◽  
Author(s):  
M. Criado ◽  
S. Fajardo ◽  
J. M. Bastidas
Keyword(s):  
Stainless Steel ◽  
Fly Ash ◽  
Lower Cost ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Nickel Content ◽  
Alkaline Solutions ◽  
Humidity Measurements ◽  
Evolution With Time ◽  
Alkali Activated

The present paper studies the corrosion behaviour of a new lower-cost type of austenitic stainless steel (SS) with a low nickel content in alkaline-saturated calcium hydroxide solution (a simulated concrete pore (SCP) solution) with sodium chloride (0.0%, 0.4%, 1.0%, 2.0%, 3.0%, and 5.0% NaCl) and embedded in alkali-activated fly ash (AAFA) mortars manufactured using two alkaline solutions, with and without chloride additions (2% and 5%), in an environment of constant 95% relative humidity. Measurements were performed at early age curing up to 180 days of experimentation. The evolution with time of electrochemical impedance spectroscopy was studied.Rctvalues obtained in SCP solution or in fly ash mortars were so high that low-nickel SS preserved its passivity, exhibiting high corrosion resistance

Effect of r-GO/TiO2 hybrid composite as corrosion-protective coating on magnesium in sulphur-based electrolyte

2018 ◽  
Vol 65 (4) ◽  
pp. 375-382 ◽  
Author(s):  
A.G. Mohan Das Gandhi ◽  
K. Soorya Prakash ◽  
V. Kavimani
Keyword(s):  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Electrochemical Behaviour ◽  
Time Interval ◽  
Nano Materials ◽  
X Ray Diffraction ◽  
Corrosive Media ◽  
Content Type ◽  
Tafel Polarization ◽  
Reduced Graphene

Purpose This paper aims to examine the investigations made on the corrosion behaviour of magnesium (Mg) substrate electrodeposited using different nano-materials. Design/methodology/approach This study uses nano-materials such as those of reduced graphene oxide (r-GO), titanium-di-oxide (TiO2) and also r-GO/TiO2 nano-composites (dispersed through ultra-sonication process) at 3-min time interval. Crystalline nature of synthesized TiO2 is studied through X-ray diffraction and its pore volume is measured to be approximately 0.1851ccg-1 by Brunauer Emmett Teller analysis. Findings Surface morphology of the developed set of specimens inspected through scanning electron microscopy and energy dispersive spectroscopy establishes a clean surface coating and further witnesses for only minimal defects. Electrochemical behaviour of the developed coating is studied exhaustively using Tafel polarization and electrochemical impedance spectroscopy in 0.1 M Na2SO4 solution. Originality/value Incremental corrosion resistance exhibited by developed composite coating owes to the factors viz. chemical stability and hydrophobic tendency of TiO2 and r-GO; these known engineering facts resist the flow of ions into the corrosive media and thereby reduce the rate of corrosion.

scholarly journals The Roles of Alkyl Branches of Ionic Liquid in the Corrosion Resistance of Pb/Sb/Sn Grids Alloy in Lead-Acid Battery

2011 ◽  
Vol 2011 ◽  
pp. 1-9 ◽  
Author(s):  
Behzad Rezaei ◽  
Ali Asghar Ensafi ◽  
Ahmad Reza Taghipour Jahromi
Keyword(s):  
Inhibition Efficiency ◽  
Electrochemical Impedance ◽  
Corrosion Behaviour ◽  
Electrochemical Behaviour ◽  
Lead Acid Battery ◽  
Reverse Effect ◽  
Adsorption Model ◽  
Peak Potential ◽  
Ammonium Hydrogen ◽  
Lead Acid

This paper describes the effects of ionic liquids (ILs) including mono, bicyclohexyl, and tetrahexyl ammonium hydrogen sulphate on the corrosion behaviour of Pb/Sb/Sn grids alloy of lead-acid battery with Pb, Sb (1.66 wt%), and Sn (0.24 wt%). Electrochemical behaviour has been investigated using Tafel plots and electrochemical impedance spectroscopy with various concentrations of ILs as electrolyte additives in 4.0 mol⋅L-1sulphuric acid. The obtained results indicated that, by increasing number of alkyl or cycloalkyl branches in ILs, the corrosion rate of the lead alloy decreases, whereas inhibition efficiency shows a reverse effect. In the presence of all ILs in different concentrations, conversion current of PbSO4to PbO2(iaandic) increases, while the reversibility, deduced from peak potential differences, decreases. Also, the effect of ILs adsorption model on the corrosion behaviour of electrode was proposed.

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