scholarly journals The Effects of Substrate Bias on the Properties of HfC Coatings Deposited by RF Magnetron Sputtering

Coatings ◽  
2021 ◽  
Vol 11 (8) ◽  
pp. 963
Author(s):  
Di Pei ◽  
Li Wang ◽  
Ming-hui Ding ◽  
Zhao-nan Hu ◽  
Jun-yu Zhao ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Bias Voltage ◽  
316L Stainless Steel ◽  
Steel Substrate ◽  
Rf Magnetron Sputtering ◽  
Substrate Bias ◽  
Stainless Steel 316L ◽  
Transmission Electron

In the paper, by using radio frequency (RF) magnetron sputter technology, the HfC coating grew on a 316L stainless steel substrate in an Ar atmosphere at various substrate bias voltages from 0 to −200 V. From the X-ray diffraction (XRD) and transmission electron microscopy (TEM) experiments, the HfC coatings were well crystallized and (111) preferential growth had been successfully obtained by controlling bias voltage at −200 V. Nanoindentation experimental results for the prepared HfC coatings indicated that they possessed the maximum nanohardness due to the formation of the (111) orientation. The results of electrochemical measurements displayed that 316L stainless steel (316L) coated with the HfC coatings had better corrosion resistance than bare 316L. With the bias voltage increasing to −200 V, adhesion of the 316L substrate with the HfC coating could be greatly improved, as well as corrosion resistance. The antithrombogenicity of the HfC coatings was identified by platelet adhesive and hemolytic ratio assay in vitro. It was shown that the hemocompatibility of coated 316L had been improved greatly compared with bare 316L and the HfC coatings possessed better antithrombogenicity with the bias voltage elevating above −150 V.

Bias voltage effect on magnetron sputtered titanium aluminum nitride TiAlN thin films properties

2019 ◽  
Vol 86 (3) ◽  
pp. 30301 ◽  
Author(s):  
Zouina Amina Ait-Djafer ◽  
Nadia Saoula ◽  
Daniel Wamwangi ◽  
Noureddine Madaoui ◽  
Hamid Aknouche
Keyword(s):  
Thin Films ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Bias Voltage ◽  
Steel Substrate ◽  
Rf Magnetron Sputtering ◽  
Substrate Bias Voltage ◽  
Tialn Coating ◽  
Fcc Phase ◽  
Steel Substrates

In this study, a negative substrate bias voltage is used to tune the structural, morphological, mechanical and electrochemical properties of TiAlN coatings fundamental for protective coating applications. TiAlN thin films have been deposited on glass, (001)Si and stainless steel substrates by RF magnetron sputtering at a power density of 4.41 W/cm2. The deposition rate was determined from X-ray reflectivity measurements to 7.00 ± 0.05 nm/min. TiAlN films used in this work were deposited for 60 min to yield a film thickness of 420 nm. Structural analysis has shown that TiAlN coating forms a cubic (fcc) phase with orientations in (111), (200), (220) and (222) planes. The deposited coatings present maximum hardness (H = 37.9 GPa) at −75 V. The dependence of hardness and Young's modulus and corrosion resistance on microstructure has been established. Electrochemical studies by potentiodynamic polarization in aggressive environment (3.5 wt.% NaCl) have revealed that stainless steel substrate with TiAlN coating exhibits excellent corrosion resistance.

Effect on corrosion resistance of microstructure of 316L austenitic stainless steel subjected to combined torsion–tension deformation

2020 ◽  
Vol 111 (5) ◽  
pp. 405-415
Author(s):  
Jidong Zhang ◽  
Weixue Han ◽  
Wenliang Rui ◽  
Jinghui Li ◽  
Zhenyi Huang ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Transmission Electron Microscopy ◽  
Grain Size ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
Tensile Deformation ◽  
Deformation Twins ◽  
Transmission Electron ◽  
316L Austenitic Stainless Steel

Abstract The influences of combined torsion-tension deformation on the microstructural evolution and corrosion resistance of 316L stainless steel were investigated. The microstructure and corrosion behavior of the deformation samples were studied in detail. The results showed that the grains were more significantly refined under combined deformation than under tensile deformation. However, further increase in pre-torsion led to little change in grain size. The results of transmission electron microscopy and corrosion tests results indicated that high-density dislocations were detrimental, whereas the corrosion resistance, grain refinement and deformation twins were beneficial to corrosion resistance. Furthermore, the effect of deformation twins on corrosion resistance was greater than that of dislocation density, which, in turn, was greater than the influence of grain size.

Effect of Negative Bias Voltage on Corrosion Resistance of TiN Coating Deposited by MAIP

2011 ◽  
Vol 399-401 ◽  
pp. 1898-1902 ◽  
Author(s):  
Lin Yuan ◽  
Yuan Gao ◽  
Wei Zhang ◽  
Cheng Lei Wang ◽  
Zhi Kang Ma ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Bias Voltage ◽  
Electrochemical Measurement ◽  
Negative Bias ◽  
Substrate Bias ◽  
Tin Coating ◽  
Negative Bias Voltage ◽  
Tin Coatings ◽  
Tin Film

In this study, TiN coatings were deposited on 201 stainless steel by multi-arc ion plating (MAIP). The effect of negative bias voltage on the surface microstructure, hardness, phase structure and the corrosion resistance of the coatings were investigated by SEM, hardness instrument, XRD and electrochemical measurement. The number and size of droplets decreased when the negative bias voltage increased from -100 V to -300 V. But when the substrate bias increased to a certain value, there were some pits appeared. The hardness increased at first and decreased later with the increasing of the negative bias voltage. When the negative bias voltage was -200 V, the hardness was the highest. The intrinsic hardness of TiN film was 2195HV. In 3.5% NaCl solution, the corrosion resistance of TiN coatings samples were improved slightly compared with 201 stainless steel. In l mol/L H2SO4 solution, the corrosion resistance of -100V sample was the best, the corrosion resistance of -100V coating sample was increased 486 times compared with untreated 201 stainless steel.

Structure and Properties of TaCx Coating on Biomedical 316L Stainless Steel by RF Magnetron Sputtering

2009 ◽  
Vol 419-420 ◽  
pp. 537-540
Author(s):  
Ming Hui Ding ◽  
Ben Li Wang ◽  
Li Li ◽  
Yu Feng Zheng
Keyword(s):  
Stainless Steel ◽  
Magnetron Sputtering ◽  
Platelet Adhesion ◽  
316L Stainless Steel ◽  
Mechanical Characteristics ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Rf Magnetron Sputtering ◽  
Sem Images ◽  
A New Species

In this paper, the TaCx coating with thickness around 1.2 μm was prepared by radio frequency magnetron sputtering technique on the 316L stainless steel substrate to improve its hemocompatibility. The structure and morphology of the coating were characterized by XRD and SEM. The XRD results indicated that TaCx, as a new species, appeared on the surface of the 316L stainless steel substrate. SEM images showed that the surface morphology of the TaCx coating was uniform and dense. The mechanical characteristics of the coating were measured by nanoindentation, giving a nanohardness of 13 GPa and a Young’s modulus of 210 GPa. The adhesion strength of the TaCx coating to 316L stainless steel depended on the sputtering bias voltages and increased for a higher bias voltage. The hemocompatibility of the TaCx coating, as evaluated by platelet adhesion tests, was compared to that of the bare 316L stainless steel. The results indicated that the hemocompatibility of 316L stainless steel with TaCx coating was significantly improved as compared to the original one.

scholarly journals Corrosion Behavior of FeB-30 wt.% Al0.25FeNiCoCr Cermet Coating in Liquid Zinc

Coatings ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 622
Author(s):  
Xiaolong Xie ◽  
Bingbing Yin ◽  
Fucheng Yin ◽  
Xuemei Ouyang
Keyword(s):  
Stainless Steel ◽  
Wear Resistance ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Liquid Zinc ◽  
Cermet Coating ◽  
Abrasion Wear ◽  
Better Than

The corrosion of galvanizing equipment parts by liquid zinc is an urgent problem that needs solving. In this work, FeB-30 wt.% Al0.25FeNiCoCr cermet coating was deposited on the surface of 316L stainless steel by AC-HVAF to protect galvanizing equipment parts from corrosion by liquid zinc. The microstructures and phase compositions of powders and the coating were determined by SEM, EDS, and XRD in detail. Additionally, the microhardness, fracture toughness, abrasion wear resistance, and corrosion resistance of the coating to liquid zinc were also studied. The results indicate that the abrasion wear resistance and corrosion resistance of the coating are much better than that of the 316L stainless steel substrate. The failure of the coating in liquid zinc is mainly due to the penetration of liquid zinc into macro-cracks, which causes the coating to peel off.

scholarly journals The Effect of Powder Composition on the Microstructure and Corrosion Resistance of Laser Cladding 60NiTi Alloy Coatings on SS 316L

Metals ◽  
2021 ◽  
Vol 11 (7) ◽  
pp. 1104
Author(s):  
Zexu Du ◽  
Zhengfei Hu ◽  
Yuqiang Feng ◽  
Fan Mo
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Laser Cladding ◽  
316L Stainless Steel ◽  
Stainless Steel Substrate ◽  
Steel Substrate ◽  
Eutectic Structure ◽  
Nacl Solution ◽  
Powder Composition ◽  
Ni Powder

Two kinds of 60NiTi powders were prepared by pure Ni mixed with Ti powders, and 55NiTi alloy powder with pure Ni powder and both the powders were fully mixed by alcohol ball milling. Two kinds of coatings (denoted as 60Ni-40Ti and 55NiTi-5Ni) were prepared on a 316L stainless steel substrate by laser cladding. The microstructure, microhardness and electrochemical behavior of the prepared coatings were investigated extensively. The results show that 55NiTi-5Ni has a typical dendritic eutectic structure, but 60Ni-40Ti tends to form a eutectic network structure. The main phases in both coatings are (Ni, Fe)Ti and (Ni, Fe)3Ti; however, the (Ni, Fe)Ti phase is dominant in 55NiTi-5Ni, but the (Ni, Fe)3Ti phase is more prevalent in 60Ni-40Ti. The microhardness was significantly improved with the 316L stainless steel substrate, and the microhardness of 55NiTi-5Ni is slightly higher than 60Ni-40Ti. The corrosion resistance of the two coatings in 3.5 wt% NaCl solution also leads to significant improvements compared with the substrate, and the corrosion resistance of 55NiTi-5Ni was also increased. These different behaviors and characteristics might be related to the different microstructures. Uniform and fine eutectic structure in 55NiTi-5Ni coating lead to better performance, which is also conducive to the formation of the dense oxide film to improve corrosion resistance.

scholarly journals Electrochemical in vitro Properties of 316L Stainless Steel for Orthodontic Applications

2019 ◽  
Vol 70 (4) ◽  
pp. 1144-1148
Author(s):  
Nicoleta Simionescu ◽  
Anca Ravoiu ◽  
Lidia Benea
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Metal Ions ◽  
Human Body ◽  
Pitting Corrosion ◽  
Root Canal ◽  
316L Stainless Steel ◽  
The Body ◽  
Necessary Condition

316L Stainless steels are widely used in biomedical applications with respect to their excellent corrosion resistance, nonmagnetic properties, high ductility and acceptable biocompatibility. There have been made electrochemical studies in-vitro in order to determine the corrosion reactions, which are necessary for foreseeing the behavior of the materials used in orthodontic applications. The degradation of metals and alloys in the human body is a combination of effects due to corrosion and mechanical activities. In dentistry, 316L stainless steel are used in a variety of applications: sterilized instruments, endodontic files in root canal therapy, metal posts in root canal treated teeth, temporary crowns, arch wires and brackets in orthodontics, a necessary condition for these applications must to resist to pitting corrosion. The pitting corrosion can be observed only in the case of passivable steels and in the presence of halogen or sulphur ions, in saline or acidic media like the human body. this type of corrosion propagates under the form of small pits, which give off to a significant quantity of metal ions, being very dangerous to the body. The metal ions resulted from the corrosive processes have allergic, carcinogenic and cytotoxic effects. The aim of this work was to evaluate the corrosion behavior of 316L stainless steel immersed in two artificial saliva solutions. The electrochemical measurements such as: open Circuit Potential (OCP), linear Polarization Resistance (LRP), and electrochemical Impedance Spectroscopy (EIS), methods were used to fulfill the corrosion evaluation. The research work concludes that the increase of the pH with a higher concentration of chloride contents lead to a lowest corrosion resistance while a decrease of the pH with a lowest concentration of chlorides contents reveals a higher corrosion resistance.

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