Corrosion resistance of WAP coating containing atmospheric plasma glow treated graphene

2020 ◽  
Vol 276 ◽  
pp. 128249
Author(s):  
Feng Ding ◽  
Xiaohu Chen ◽  
Tian Tian ◽  
Fengkun Li ◽  
Dongbo Wei ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Atmospheric Plasma ◽  
Plasma Glow

Microstructure and Corrosion Resistance of Fe-Based Amorphous Coating Prepared Atmospheric Plasma Spraying

2012 ◽  
Vol 557-559 ◽  
pp. 1768-1771
Author(s):  
Xiao Bing Zhao ◽  
Zhi Hui Ye
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Plasma Spraying ◽  
Amorphous Powder ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Amorphous Coating ◽  
X Ray Diffraction ◽  
X Ray ◽  
Steel Substrates

Fe-based amorphous coating was prepared on stainless steel substrates by atmospheric plasma spraying (APS) using Fe-based amorphous powder as feedstock. Microstructures of the coating were investigated by means of X-ray diffraction (XRD), scanning electron microscopy (SEM). The corrosion behavior of coating and stainless steel were evaluated respectively in 3.5% NaCl, 10% NaOH and 1 mol/L H2SO4 aqueous solutions by electrochemical workstation. The results indicated that the coating was composed of most amorphous phase and some Fe-Cr crystalline phase. The coating exhibited the better corrosion resistance in H2SO4 solution, while the worse in NaOH.

scholarly journals High-Temperature Corrosion of APS- and HVOF-Coated Nickel-Based Super Alloy under Air Oxidation and Melted Salt Domains

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5119
Author(s):  
Ibrahim A. Alnaser ◽  
Mohammed Yunus ◽  
Rami Alfattani ◽  
Turki Alamro
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
High Surface ◽  
Thermal Spraying ◽  
Mass Gain ◽  
High Temperature Corrosion ◽  
Atmospheric Plasma ◽  
Air Oxidation ◽  
Hvof Spraying ◽  
High Surface Quality

Various thermal spraying approaches, such as air/atmospheric plasma spraying (APS) and high-velocity oxy-fuel (HVOF) spraying, are widely employed by plants owing to their flexibility, low costs and the high surface quality of the manufactured product. This study focuses on the corrosion behavior of a Ni superalloy coated with powder Cr3C2-25NiCr through APS and HVOF at 950 °C under air oxidation and Na2SO4 + 0.6V2O5 molten salt environments (MSE). The results show that HVOF-deposited Ni superalloys have higher hardness and bond strength than the respective APS coating. The thermo-gravimetric probe reveals that the Ni superalloys exposed to an oxidizing air environment has a minor mass gain compared to those under the MSE domain for both non-coated and coated samples, in line with the parabola curvature rate oxidizing law. The Ni superalloys show good corrosion resistance but poor oxidation resistance in APS-deposited Ni superalloys under the MSE. HVOF-coated Ni superalloys in both environments exhibit better corrosion resistance and lower mass gain than APS-coated superalloys. The excellent coating characteristics of HVOF-coated Ni superalloys lead to their better high-temperature corrosion performance than APS.

Fabrication and Properties of APS- and RTS-Sprayed TiB2/Mo2FeB2 Multiphase Ceramic Coating on Q235 Steel

2011 ◽  
Vol 704-705 ◽  
pp. 1244-1252 ◽  
Author(s):  
Xin Ling Guo ◽  
Wei Wang ◽  
Shao Jie Li
Keyword(s):  
Wear Resistance ◽  
Corrosion Resistance ◽  
Mass Loss ◽  
Thermal Shock ◽  
Steel Substrate ◽  
Ceramic Coatings ◽  
Atmospheric Plasma ◽  
Composite Powders ◽  
Q235 Steel ◽  
Sprayed Coatings

A kind of TiB2/Mo2FeB2 composite powders for reactive thermal spraying (RTS) and atmospheric plasma spraying (APS) were prepared using Mo powder, Fe-B alloy powder, Fe powder and TiB2 powder. The TiB2/Mo2FeB2 composite ceramic coatings were synthesized and deposited by APS and RTS on Q235 steel. Microstructure and phases were investigated by X-ray diffraction (XRD) and scanning electrical microscopy (SEM). The thermal shock resistance, wear resistance and corrosion resistance were characterized with the relevant lab testing equipment. The result indicates that the coatings are composed of the major phases Mo2FeB2, TiB2 and α-Fe, a little of Fe2O3, FeO, and B2O3.The thermal shock times of RTS-sprayed coatings is 44, the corrosion resistance is 6.07 times than those of the substrate, respectively, while those of APS-sprayed coatings are 55 and 15.5, respectively. The mass loss of Q235 steel is 138.6g/m2, while the mass loss of the coatings with 30% TiB2 which were prepared by RTS is 28.0952g/m2, the mass loss of the coatings with 30% which were prepared by APS is 15.4028g/m2, when the testing load was 400N. Therefore, the coatings with 30%TiB2 prepared by APS possess better wear resistance than the Q235 steel substrate.

scholarly journals Frictional Wear and Corrosion Behavior of AlCoCrFeNi High-Entropy Alloy Coatings Synthesized by Atmospheric Plasma Spraying

Entropy ◽  
2020 ◽  
Vol 22 (7) ◽  
pp. 740
Author(s):  
Yongkun Mu ◽  
Liangbo Zhang ◽  
Long Xu ◽  
Kondagokuldoss Prashanth ◽  
Nizhen Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Plasma Spraying ◽  
Corrosion Behavior ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
High Entropy Alloy ◽  
High Entropy ◽  
Frictional Wear ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance

High-entropy alloy coatings (HEAC) exhibit good frictional wear and corrosion resistances, which are of importance for structure materials. In this study, the microstructure, surface morphology, hardness, frictional wear and corrosion resistance of an AlCoCrFeNi high-entropy alloy coating synthesized by atmospheric plasma spraying (APS) were investigated. The frictional wear and corrosion resistance of the coating are simultaneously improved with an increase of the power of APS. The influence of the APS process on the microstructure and mechanical behavior is elucidated. The mechanisms of frictional wear and corrosion behavior of the AlCoCrFeNi HEAC are discussed in detail.

scholarly journals The influence of plasma-sprayed coatings on surface properties and corrosion resistance of 316L stainless steel for possible implant application

2021 ◽  
Vol 21 (4) ◽  
Author(s):  
Anna Woźniak ◽  
Marcin Staszuk ◽  
Łukasz Reimann ◽  
Oktawian Bialas ◽  
Zbigniew Brytan ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
316L Stainless Steel ◽  
Composite Coatings ◽  
Ringer Solution ◽  
Substrate Material ◽  
Atmospheric Plasma ◽  
Plasma Sprayed Coatings ◽  
Plasma Sprayed ◽  
Sprayed Coatings

AbstractHerein, we analyzed the morphology of atmospheric plasma-sprayed (APS) coating on medical 316L stainless steel and its influence on the physical and electrochemical properties of implant application. Five types of coatings were examined: hydroxyapatite (HAp), titanium (Ti), zirconium (Zr), Ti/HAp and Zr/HAp. The base properties of the coatings were analyzed via chemical and phase composition, surface topography, surface wettability and in particular the corrosion resistance in Ringer solution in immersed conditions and potentiodynamic test, and EIS analysis. APS coating of pure HAp on 316L stainless steel showed poor cohesive bonding to the substrate material, whereas the application of Ti and Zr interlayer prior to HAp deposition improved surface morphology and coating properties. The beneficial effect of Ti and Zr interlayer under HAp layer on binding was demonstrated. HAp containing coatings (HAp, Ti/HAp and Zr/HAp) show Ca/P ratio greater than 1.8, which may positively influence the differentiation of osteogenic cells and good adhesion to bones. Among the studied materials, the composite coatings with Zr or Zr/HAp showed favorable physicochemical properties and the highest corrosion resistance in Ringer solution.

Characteristics of Phosphoric Acid Sealed Ceramic Oxide Coatings

1996 ◽  
Author(s):  
E. Kumpulainen ◽  
M. Vippola ◽  
P. Vuoristo ◽  
P. Sorsa ◽  
T. Mäntylä
Keyword(s):  
Corrosion Resistance ◽  
Phosphoric Acid ◽  
Zirconium Oxide ◽  
Ceramic Coatings ◽  
Atmospheric Plasma ◽  
Curing Temperature ◽  
Oxide Coatings ◽  
Heat Treated ◽  
Plasma Sprayed ◽  
Hardness Values

Abstract Plasma sprayed ceramic coatings usually have relatively high open porosity in order to provide a good corrosion protection. By using sealants the porosity values can be reduced. In this study atmospheric plasma sprayed (APS) aluminium oxide, chromium oxide and zirconium oxide coatings were sealed by a phosphoric acid treatment. After impregnation the coatings were heat treated at a curing temperature of 400°C. Phosphoric acid was found to react with the coating material during the heat treatment. Wear resistance was evaluated by rubber wheel abrasion tests and corrosion resistance by electrochemical potentio-dynamic polarization tests. Hardness values were also measured. Corrosion resistance and hardness values of sealed coatings were remarkable better in comparison to the unsealed coatings. Rubber wheel abrasion resistances of the sealed coatings were equal to those of Al2O3, ZTA, SiC and Si3N4 sintered ceramics.

Atmospheric Plasma Spraying of Run-in Coatings for Twin-Screw Compressors

2000 ◽  
Author(s):  
Fr.-W. Bach ◽  
T. Duda ◽  
W. Unterberg ◽  
L.A. Josefiak
Keyword(s):  
Corrosion Resistance ◽  
Plasma Spraying ◽  
Atmospheric Plasma Spraying ◽  
Yttria Stabilized Zirconia ◽  
Thermal Spray Coatings ◽  
Atmospheric Plasma ◽  
Stabilized Zirconia ◽  
Spray Coatings ◽  
Twin Screw ◽  
Screw Rotors

Abstract This paper examines the potential of thermal spray coatings for manufacturing and repairing twin-screw rotors. The coatings evaluated were produced by atmospheric plasma spraying (APS). Tests show that 7% yttria stabilized zirconia (ZrO27Y2O3) coatings provide sufficient run-in characteristics and corrosion resistance. The coatings, along with a NiCrAl bond coat, were applied to various substrate materials.

The Effect of Spraying Conditions on the Corrosion Resistance of Titanium Coatings for Surgical Implants

1996 ◽  
Author(s):  
B. Normand ◽  
F. Renaud ◽  
C. Coddet ◽  
F. Tourenne
Keyword(s):  
Corrosion Resistance ◽  
Plasma Spraying ◽  
Corrosion Behaviour ◽  
Electrochemical Techniques ◽  
Deposition Process ◽  
Atmospheric Plasma Spraying ◽  
Atmospheric Plasma ◽  
Localized Corrosion ◽  
Titanium Coating ◽  
Pmma Bone Cement

Abstract One cause of aseptic loosening of total hip replacement (THR) results from the hard polymetylmethacrylate (PMMA) bone cement debris embedded within some of acetabular cups [1]. To prevent this failure, PMMA can be replaced by a titanium coating with a specific roughness to promote the bone bonding. In this work, inert and atmospheric plasma spraying was used to coat Ti.6A1.4V implants with titanium.] In order to evaluate the effect of the deposition process on the coating corrosion resistance, different electrochemical techniques were implemented in physiological (i. e., Ringer) and in acidic solutions. Results show that the spraying parameters and the coating morphology affect the corrosion behaviour. Thus, if the reactivity is not affected by the pH evolution, the pitting sensitivity depends on the process. It was found that coatings deposited under inert gas are free of oxides and dense, even when the atmosphere contains some hydrogen. In that case a significant improvement of the intrinsic localized corrosion resistance is observed versus deposits obtained using atmospheric plasma spraying.

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