scholarly journals Characterization of PTFE Film on 316L Stainless Steel Deposited through Spin Coating and Its Anticorrosion Performance in Multi Acidic Mediums

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 388 ◽  
Author(s):  
Waseem Akram ◽  
Amer Farhan Rafique ◽  
Nabeel Maqsood ◽  
Afzal Khan ◽  
Saeed Badshah ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Spin Coating ◽  
316L Stainless Steel ◽  
Electrochemical Corrosion ◽  
Hardness Test ◽  
Coated Sample ◽  
Uncoated Sample ◽  
Ptfe Film ◽  
Adhesion Properties ◽  
Coated Substrate

Polytetrafluoroethylene (PTFE) was coated on 316L stainless steel (SS) substrate through a spin coating technique to enhance its corrosion resistance properties in hydrochloric acid (HCl) and nitric acid (HNO3) medium. Scanning electron microscopy (SEM) revealed the morphology of the coated and uncoated substrates and showed a uniform and crack-free PTFE coating on 316L SS substrate, while a damaged surface with thick corrosive layers was observed after the electrochemical test on the uncoated sample. However, an increased concentration of HCl and HNO3 slightly affected the surface morphology by covering the corrosive pits. An atomic force microscope (AFM) showed that the average surface roughness on 316L SS and PTFE coating was 26.3 nm and 24.1 nm, respectively. Energy dispersive X-ray spectroscopy (EDS) was used for the compositional analysis, which confirmed the presence of PTFE coating. The micro Vickers hardness test was used to estimate the hardness of 316L SS and PTFE-coated substrate, while the scratch test was used to study the adhesion properties of PTFE coating on 316L SS. The anticorrosion measurements of 316L SS and PTFE-coated substrates were made in various HCl and HNO3 solutions by using the electrochemical corrosion test. A comparison of the corrosion performance of PTFE-coated substrate with that of bare 316L SS substrate in HCl medium showed a protection efficiency (PE) of 96.7%, and in the case of HNO3 medium, the PE was 99.02%, by slightly shifting the corrosion potential of the coated sample towards the anodic direction.

Evaluation of the Adhesion of Ultra-Thin Teflon-Like Films Deposited by Plasma on 316L Stainless Steel for Long-Term Stable Drug-Eluting Stents

2006 ◽  
Vol 15-17 ◽  
pp. 119-124 ◽  
Author(s):  
François Lewis ◽  
Benoit Maheux-Lacroix ◽  
Stephane Turgeon ◽  
D. Mantovani
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Tensile Force ◽  
Original Method ◽  
Pulsed Plasma ◽  
Stent Deployment ◽  
Adhesion Properties ◽  
Permanent Strain ◽  
Intravascular Stents

Metallic intravascular stents are medical devices commonly made of 316L stainless steel or nitinol used to scaffold a biological lumen, most often diseased arteries, after balloon angioplasty. Stenting procedures reduce the risk of restenosis, but do not eliminate it completely. Indeed, restenosis remains the principal cause of clinical complications, leading to up to 30 % of failure after 3 months of implantation. During the last few years, several works have been focused on the development of an appropriate coating able to act as a carrier for specific anti-restenosis drugs. Moreover, this coating would act as an anti-corrosive barrier, thus inhibiting the release of potentially toxic ions. Actually, the main challenges in stent coatings are to synthesize a biocompatible polymer coating resistant to blood flow, wall shear stress and tensile force after the stent deployment which results in a permanent strain of up to 25%. The adhesion and chemical resistance after deployment are critical properties to investigate for the improvement of the long-term reliability of polymer coated stent. The aim of this study was to evaluate the effect of a 25% equivalent plastic deformation on chemical, mechanical and adhesion properties of Teflon-like films deposited on 316L stainless steel. These properties were studied by chemical spectroscopy and atomic force microscopy. Teflon-like films were deposited by pulsed plasma glow discharges on flat electropolished 316L stainless steel. An original method has been developed to induce the deformation, and preliminary results have showed that the 12 nm thick Teflon-like films successfully resist to deformations of up to 25%.

Apparent Inversion of the Effect of Alloyed Molybdenum for Corrosion of Ordinary and Enhanced 316L Stainless Steel in Sulfuric Acid

2008 ◽  
Vol 1107 ◽  
Author(s):  
Gloria Kwong ◽  
Anatolie Carcea ◽  
Roger C. Newman
Keyword(s):  
Stainless Steel ◽  
Carbon Steel ◽  
Corrosion Test ◽  
316L Stainless Steel ◽  
Storage System ◽  
Electrochemical Corrosion ◽  
Premature Failure ◽  
316L Steel ◽  
Electrochemical Corrosion Test ◽  
Spent Resin

AbstractAn aging assessment of the OPG waste resin storage system predicted the potential for premature failure of the carbon steel resin liners. Consequently, resin liners made of 316L stainless steel with a minimum content of 2.5% molybdenum were selected to replace the carbon steel liners. The 2.5% Mo 316L stainless steel was specified to enhance pitting resistance in the spent resin environment. With the additional Mo, one would expect that a brief electrochemical corrosion test will reveal the superiority of such alloy over conventional 316L steel. This study reports a contrary experience

Modification of corrosion and tribological properties of 316L stainless steel by cathodic plasma electrolytic deposition of zirconia

2015 ◽  
Vol 62 (5) ◽  
pp. 288-293 ◽  
Author(s):  
Shabnam Karimi ◽  
Fatemeh Mahzoon ◽  
Sirus Javadpour ◽  
Kamal Janghorban
Keyword(s):  
Stainless Steel ◽  
Surface Layer ◽  
Tribological Properties ◽  
316L Stainless Steel ◽  
Coated Sample ◽  
Electrolytic Deposition ◽  
Stainless Steel Surface ◽  
Content Type ◽  
Cathodic Plasma ◽  
Plasma Electrolytic

Purpose – This paper aims to study the deposition of ZrO2 on 316L stainless steel surface using cathodic plasma electrolytic deposition (CPED) technique in potassium hexafluorozirconate (K2ZrF6) electrolyte solution to promote its corrosion and tribological properties. Design/methodology/approach – Plasma electrolytic oxidizing (PEO) technique is commonly used to form zirconium dioxide (ZrO2) on various substrates. But, in this paper, cathodic type of this technique (CPED) was used. Findings – Composition of the surface layer was analyzed by X-ray diffraction (XRD) and the formation of ZrO2 on the substrate was confirmed. Scanning electron microscope (SEM) was used to observe the unique morphology of the surface layer. The corrosion resistance of the coated surface was investigated by electrochemical methods involving cyclic voltammetery in Ringer’s solution. The treated sample showed a better pitting resistance. Pin-on-disk wear tests revealed that the friction coefficient of the coated sample is lower than that of the substrate. Also, it was shown that hardness and roughness of the coated sample increased after plasma electrolytic treatment. Originality/value – This paper considers the CPED of ZrO2 coating on 316L stainless steel. Some recent research works with ZrO2 coating have been prepared by PEO. There is limited or no record on the study of ZrO2 coatings by CPED process. In this study, the effort has been made to prepare a zirconia (ZrO2) coating on the stainless steel substrate through cathodic plasma electrolytic process under 200 V. Due to the excellent wear resistance, ZrO2 may be used as a high resistant and protective coating on stainless steels, which are widely used in industries and biomedical applications.

scholarly journals Tribo-Behavior and Corrosion Properties of Welded 304L and 316L Stainless Steel

Coatings ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1567
Author(s):  
Hany S. Abdo ◽  
Asiful H. Seikh ◽  
Hamad F. Alharbi ◽  
Jabair Ali Mohammed ◽  
Mahmoud S. Soliman ◽  
...  
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Gas Metal Arc Welding ◽  
Electrochemical Corrosion ◽  
304L Stainless Steel ◽  
High Deposition Rate ◽  
Corrosion Properties ◽  
Metal Arc Welding ◽  
316L Steel ◽  
304L Steel

The present study investigates the electrochemical corrosion response and tribo-behavior of 304L and 316L stainless steel welded by gas metal arc welding (GMAW), which offered a high deposition rate. During this research, the metallurgically prepared welded samples were subjected to a tribological test and a corrosion test. The wear results were favorable for 316L steel, and it showed a lower coefficient of friction than the 304L specimen. These samples also underwent characterization studies, such as X-ray diffractometry (XRD) and scanning electron microscopy (SEM), to identify the different phases obtained on the cooling of the weld pool. Finally, both specimens were compared against their mechanical properties. Owing to the above properties, the 316L sample showed lasting durability, as compared to the 304L steel. The primary compositional difference is the higher presence of molybdenum and chromium in the 316L steel, compared to the 304L stainless steel.

scholarly journals Material Characterization of 316L Stainless Steel After Being Subjected To Cryogenic Treatment

2013 ◽  
pp. 156-160
Author(s):  
Mohd Touseef Nauman ◽  
S. Rasool Mohideen ◽  
Nasreen Kaleem
Keyword(s):  
Stainless Steel ◽  
316L Stainless Steel ◽  
Impact Test ◽  
Cryogenic Treatment ◽  
Charpy Impact ◽  
Hardness Test ◽  
Charpy Impact Test ◽  
Deep Cryogenic Treatment ◽  
Shear Area

Post processing of materials is necessary to suit them for the intended requirements. The properties of stainless steel of grade 316L cannot be influenced with further processing such as hot working [1]. Thus the current study aims at investigating the properties of stainless steel of grade 316L after being subjected to deep cryogenic treatment. The specimens from both cryogenically treated and untreated conditions were subjected to Tensile Test, Charpy Impact Test, Rockwell Hardness Test, Microstructure and Percentage Shear Area Analysis and the results thus obtained are discussed in this paper. The results have shown that cryogenic treatment has improved the hardness and strength.

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