scholarly journals Spectroscopic Investigations of 316L Stainless Steel under Simulated Inflammatory Conditions for Implant Applications: The Effect of Tryptophan as Corrosion Inhibitor/Hydrophobicity Marker

Coatings ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 1097
Author(s):  
Dominika Święch ◽  
Gaetano Palumbo ◽  
Natalia Piergies ◽  
Ewa Pięta ◽  
Aleksandra Szkudlarek ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Conformational Changes ◽  
Local Environment ◽  
Protective Efficiency ◽  
Inflammatory Conditions ◽  
Protonated Amine ◽  
Short Period ◽  
316 L Stainless Steel ◽  
Ft Ir ◽  
Phosphate Buffered Saline

In this paper, the conformational changes of tryptophan (Trp) on the corroded 316 L stainless steel (SS) surface obtained under controlled simulated inflammatory conditions have been studied by Raman (RS) and Fourier-transform infrared (FT-IR) spectroscopy methods. The corrosion behavior and protective efficiency of the investigated samples were performed using the potentiodynamic polarization (PDP) technique in phosphate-buffered saline (PBS) solution acidified to pH 3.0 at 37 °C in the presence and absence of 10−2 M Trp, with different immersion times (2 h and 24 h). The amino acid is adsorbed onto the corroded SS surface mainly through the lone electron pair of the nitrogen atom of the indole ring, which adopts a more/less tilted orientation, and the protonated amine group. The visible differences in the intensity of the Fermi doublet upon adsorption of Trp onto the corroded SS surface, which is a sensitive marker of the local environment, suggested that a stronger hydrophobic environment is observed. This may result in an improvement of the corrosion resistance, after 2 h than 24 h of exposure time. The electrochemical results confirm this statement—the inhibition efficiency of Trp, acting as a mixed-type inhibitor, is made drastically higher after a short period of immersion.

Synthesis, characterization and corrosion protection properties of polyN-(p-bromophenyl)-2-methacrylamide-co-glycidyl methacrylate on low nickel stainless steel

2011 ◽  
Vol 31 (2-3) ◽  
Author(s):  
Sakvai Mohammed Safiullah ◽  
Deivasigamani Thirumoolan ◽  
Kottur Anver Basha ◽  
K. Mani Govindaraju ◽  
Dhanraj Gopi ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Protection ◽  
Glycidyl Methacrylate ◽  
Electrochemical Impedance ◽  
Thermo Gravimetric Analysis ◽  
Gel Permeation Chromatography ◽  
Gravimetric Analysis ◽  
Scanning Calorimetry ◽  
Protection Efficiency ◽  
Ft Ir

Abstract The synthesis of copolymers from different feed ratios of N-(p-bromophenyl)-2- methacrylamide (PBPMA) and glycidyl methacrylate (GMA) was achieved by using free radical solution polymerization technique and characterized using FT-IR, 1H and 13C NMR spectroscopy. The thermal stability of the synthesized copolymers was studied using thermo-gravimetric analysis (TGA) and differential scanning calorimetry (DSC). The molecular weight of the copolymer is determined by gel permeation chromatography (GPC). The corrosion performances of low nickel stainless steel specimens dip coated with different composition of copolymers were investigated in 0.5 M H2SO4 using potentiodynamic polarization and electrochemical impedance spectroscopic (EIS) techniques. The polarization and impedance measurements showed different corrosion protection efficiency with change in composition of the copolymers. It was found that the corrosion protection properties are owing to the barrier effect of the polymer layer covered on the low nickel stainless steel surfaces. However, it is observed that the mole ratio of PBPMA and GMA plays a major role in the protective nature of the copolymer.

Low-pressure injection molding processing of a 316-L stainless steel feedstock

2002 ◽  
Vol 52 (4-5) ◽  
pp. 360-365 ◽  
Author(s):  
M Rei ◽  
E.C Milke ◽  
R.M Gomes ◽  
L Schaeffer ◽  
J.P Souza
Keyword(s):  
Stainless Steel ◽  
Injection Molding ◽  
Low Pressure ◽  
Pressure Injection ◽  
316 L Stainless Steel

Electropolishing of 316 L Stainless Steel Parts Elaborated By Additive Manufacturing: From Laboratory to Pilot Scale

2021 ◽  
Vol MA2021-02 (25) ◽  
pp. 802-802
Author(s):  
Estelle Drynski ◽  
Marie-Laure Doche ◽  
Jean-Yves Hihn ◽  
Florian Roy ◽  
Yann Dugenet ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Additive Manufacturing ◽  
Pilot Scale ◽  
316 L Stainless Steel

Stainless Steel Coatings for Corrosion Protection of Steel Rebars

1996 ◽  
Author(s):  
B. Arsenault ◽  
P. Gu ◽  
J.G. Legoux ◽  
B. Harvey ◽  
J. Fournier
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Salt Spray ◽  
Chloride Ions ◽  
Metallographic Examination ◽  
316 L Stainless Steel ◽  
Parking Garages ◽  
Coating Microstructure ◽  
Stainless Steel Coatings ◽  
Steel Rebars

Abstract Steel reinforcement corrosion is one of the most serious causes of the premature deterioration of North American bridges and parking garages. Carbon steel rebars are very vulnerable to corrosion in salt contaminated concrete from deicing or coastal environment since the chloride ions induce severe corrosion as they reach the reinforcing steel rebars and depassivate the carbon steel. This paper evaluates the potential of using stainless steel coatings as a means to protect steel rebars from corrosion, especially in a salt contaminated concrete environment. The 316 L stainless steel coated coupons and rebars were prepared using Arc-sprayed and HP/HVOF processes. The corrosion performance of coatings were evaluated using linear polarization, a.c. impedance and salt spray techniques. Metallographic examination was also performed to characterize the coating microstructure.

scholarly journals Modeling and planning of bentonite clay mining: a case study at Bañado de Medina, Melo, Uruguay

2013 ◽  
Vol 66 (4) ◽  
pp. 521-528
Author(s):  
Renato da Silva Marques ◽  
Luis Eduardo de Souza ◽  
Luiz Delfino Albarnaz ◽  
Raul Oliveira Neto
Keyword(s):  
Environmental Impacts ◽  
Bentonite Clay ◽  
Local Environment ◽  
Mineral Deposit ◽  
Mitigation Measures ◽  
Mining Activities ◽  
Short Period ◽  
Geological Complexity

Mining planning and its correct sequencing are essential to facilitate the exploitation of minerals both economically and environmentally, thus ensuring the feasibility of the mining in operational and economic terms. The small geological complexity or the low aggregate value of a mineral deposit tends to result in the planning stages being neglected, so the mining begins without the necessary detailing or it is only scheduled for a short period of time. Thus, in order to ensure a sustainable sequence of operations, and to predict the environmental impacts caused by mining activities and suggest options that would allow the establishment of mitigation measures for these impacts, the feasibility of the technical and economic utilization was evaluated for an occurrence of bentonite in the Bañado de Medina deposit located in the Department of Cerro Largo, Uruguay, respecting the local environment in the process so as to give the project a strong character of sustainability.

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