scholarly journals Study of the thermally sprayed Zn coatings in the context of use in special purpose articles

2018 ◽  
Vol 90 (11) ◽  
Author(s):  
Mariusz Bober ◽  
Rafał Milczarek ◽  
Marek Żubrowski ◽  
Wojciech Sokołowski
Keyword(s):  
Corrosion Resistance ◽  
Alloy Steel ◽  
Steel Substrate ◽  
Atmospheric Conditions ◽  
High Corrosion Resistance ◽  
Protective Layers ◽  
Operational Tests ◽  
Steel Substrates ◽  
Thermally Sprayed ◽  
Salt Fog

The paper presents the results of operational tests of thermal sprayed zinc coatingsof various thicknesses on non-alloy steel substrates. The resistance of coatings to:variable temperature cycles, increased ambient humidity, salt fog as well as the electri-cal resistance of the coating and its adhesion to the steel substrate were tested. It hasbeen shown that Zn coatings has a high corrosion resistance in various atmospheric conditions and have satisfactory properties so they can be protective layers of ma-chine parts used in the armaments industry.

scholarly journals Fabrication and Characterization of Zein/Hydroxyapatite Composite Coatings for Biomedical Applications

Surfaces ◽  
2020 ◽  
Vol 3 (2) ◽  
pp. 237-250 ◽  
Author(s):  
Yusra Ahmed ◽  
Muhammad Yasir ◽  
Muhammad Atiq Ur Rehman
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Biomedical Applications ◽  
Steel Substrate ◽  
Composite Coatings ◽  
Sem Images ◽  
Taguchi Design Of Experiments ◽  
Hydrophilic Nature ◽  
Strong Adhesion ◽  
Steel Substrates

Stainless steel is renowned for its wide use as a biomaterial, but its relatively high corrosion rate in physiological environments restricts many of its clinical applications. To overcome the corrosion resistance of stainless steel bio-implants in physiological environments and to improve its osseointegration behavior, we have developed a unique zein/hydroxyapatite (HA) composite coating on a stainless steel substrate by Electrophoretic Deposition (EPD). The EPD parameters were optimized using the Taguchi Design of experiments (DoE) approach. The EPD parameters, such as the concentration of bio-ceramic particles in the polymer solution, applied voltage and deposition time were optimized on stainless steel substrates by applying a mixed design orthogonal Taguchi array. The coatings were characterized by using scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX) and wettability studies. SEM images and EDX results indicated that the zein/HA coating was successfully deposited onto the stainless steel substrates. The wettability and roughness studies elucidated the mildly hydrophilic nature of the zein/HA coatings, which confirmed the suitability of the developed coatings for biomedical applications. Zein/HA coatings improved the corrosion resistance of bare 316L stainless steel. Moreover, zein/HA coatings showed strong adhesion with the 316L SS substrate for biomedical applications. Zein/HA developed dense HA crystals upon immersion in simulated body fluid, which confirmed the bone binding ability of the coatings. Thus the zein/HA coatings presented in this study have a strong potential to be considered for orthopedic applications.

scholarly journals Nature of Steel Effect on Intermetallic Compounds Obtained by Galvanization

2016 ◽  
Vol 11 (1) ◽  
Keyword(s):  
Intermetallic Compounds ◽  
Steel Substrate ◽  
Optical Microscope ◽  
Atmospheric Conditions ◽  
X Ray Diffraction ◽  
Zinc Bath ◽  
X Ray ◽  
Hardness Tester ◽  
Corrosion Of Steel ◽  
Steel Substrates

Zinc and some of its alloys have a number of characteristics that make it well suited for use as a protective coating against the corrosion of steel substrates under severe atmospheric conditions. The metal of zinc, which represents the main galvanization element offer then a cathodic protection to the ferrous materials. Because of these excellent characteristics, galvanization coatings are expected to be used for different protective applications fields. The objective of this work is to study the influence of the nature of steel substrate on the microstructure and the hardness of the intermetallic compounds. The steels used as the substrate are employed in agriculture field as tubes and irrigation elements in pivot. After an optimal preparation of the surface of the substrate by an appropriate roughness process, the steels specimen were immersed in a molten zinc bath maintained at 450°C. The chemical reactions which take place between the steel and the liquid zinc give rise to the formation of the  and  intermetallic compounds and the -Fe/Zn solid solution. The structure of coating was identified by X ray diffraction. The morphology and thickness of phases formed the coatings at different parameters took place with optical microscope. Finally the hardness of coatings was measured with a Vickers hardness tester.

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.

Corrosion Resistance and Electrical Conductivity of TiN/CrN Multilayer Coated Stainless Steel

2011 ◽  
Vol 214 ◽  
pp. 291-295
Author(s):  
Wei Yu Ho ◽  
Chung Hsien Yang ◽  
Wei Che Huang ◽  
Woei Yun Ho
Keyword(s):  
Electrical Conductivity ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Steel Substrate ◽  
Bipolar Plate ◽  
Layered Coatings ◽  
Cathodic Arc Deposition ◽  
Metallic Bipolar Plate ◽  
Cell Test ◽  
Steel Substrates

In this study, various multilayered TiN/CrN coatings were deposited on the SS316L stainless steel substrates by the cathodic arc deposition technique. By varying the turntable rotation speed, the multilayered coatings with different periodic layer thickness were obtained. The main target of this study is to enhance the corrosion resistance and electrical conductivity of the stainless steel for potential application of metallic bipolar plate of PEMFC. The results showed that all of the TiN/CrN coated samples presented a better corrosion resistance than the bare stainless steel substrate. The multi-layered coatings deposited at the 2 rpm provided the best corrosion resistance of the coated stainless steels when they were subjected to polarization test in 1M H2SO4 solution. The result of single fuel cell test shows that the TiN/CrN multi-layered coating with the best corrosion resistance is considered to be a candidate for PEMFC bipolar plate application in this study.

COOPER ALLOY 17SM

Alloy Digest ◽  
1957 ◽  
Vol 6 (3) ◽  
Keyword(s):  
Fracture Toughness ◽  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Alloy Steel ◽  
Elevated Temperatures ◽  
Heat Treating ◽  
High Corrosion Resistance ◽  
Temperature Performance

Abstract COOPER ALLOY 17SM is a chromium-nickel-molybdenum alloy steel having high corrosion resistance and good strength at elevated temperatures. It is similar to A. C. I. CF-8M alloy. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fracture toughness and creep. It also includes information on low and high temperature performance, and corrosion resistance as well as casting, heat treating, machining, and joining. Filing Code: SS-53. Producer or source: Cooper Alloy Corporation.

scholarly journals Microstructure, Microhardness, Corrosion Resistance and Chemical Composition of Mo, B and Mo-B Coatings Produced Using Laser Processing

Materials ◽  
2020 ◽  
Vol 13 (15) ◽  
pp. 3249 ◽  
Author(s):  
Aneta Bartkowska ◽  
Dariusz Bartkowski ◽  
Mikołaj Popławski ◽  
Adam Piasecki ◽  
Damian Przestacki ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Laser Beam ◽  
Cross Sections ◽  
Steel Substrate ◽  
Scanning Speed ◽  
Beam Power ◽  
Laser Alloying ◽  
Properties Of Coatings ◽  
Study Results ◽  
Steel Substrates

The paper presents study results of laser alloying of CT90 tool steel with an applied pre-coat of boron, molybdenum or a mixture of these elements. Pre-coats were applied on steel substrates in the form of a paste. The aim of the study was to investigate the microstructure, chemical and phase composition, microhardness and corrosion resistance of these newly-formed coatings. The laser alloying process was carried out using a diode laser with a nominal power of 3 kW. In this study a laser beam power of 900 W and a scanning speed of 48 mm/s were used. As a result of the laser beam action, the presence of three areas was observed in cross-sections of specimens: a remelted zone, a heat affected zone and the substrate. The properties of coatings enriched with both molybdenum and boron were better than those of the steel substrate, but only the use of a Mo-B mixture resulted in a significant improvement in microhardness and corrosion resistance.

scholarly journals Synergistic effect of nanocoatings for corrosion and wear protection of steel surfaces

2019 ◽  
Vol 20 (4) ◽  
pp. 1-9
Author(s):  
José Jaime Taha Tijerina ◽  
Laura Peña Parás ◽  
Antonio Sánchez Fernández ◽  
Demófilo Maldonado Cortés ◽  
Pablo Sarmiento Barbosa ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Synergistic Effect ◽  
Vinyl Ester ◽  
Steel Substrate ◽  
Salt Spray ◽  
Corrosion And Wear ◽  
Nanocomposite Coatings ◽  
Wear Protection ◽  
Steel Surfaces ◽  
Steel Substrates

The purpose of this paper is to evaluate the corrosion and wear protection of a steel substrate by epoxy vinyl ester nanocomposite coatings with Zn and TiO2 nanoparticle fillers. Steel substrates were coated with epoxy vinyl ester nanocomposites, varying Zn and TiO2 nanofiller concentrations and combinations of both nanoparticles. Corrosion resistance was evaluated by salt spray fog test during 480h, according to ASTM B-117. The degree of damage was obtained quantitatively by measuring the enhancement in corroded area compared to the scribe mark. Tribological evaluation was performed with a ball-on-disk tribotester, according to ASTM G-99. Results showed that the combination of Zn and TiO2 nanofillers in an epoxy vinyl ester coating provide a synergistic effect, enhancing corrosion protection due to their combined corrosion and tribological reducing mechanisms.

scholarly journals Investigation of Corrosion Resistance of poly(o-phenylenediamine)-ZnO Composites on Carbon Steel

2018 ◽  
Author(s):  
Chaogang Zhou ◽  
Chaojin Zhou ◽  
Jiawei Zhang
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Electrochemical Impedance ◽  
In Situ Polymerization ◽  
Steel Substrate ◽  
Electrochemical Corrosion ◽  
Polymer Coatings ◽  
As Doping ◽  
Composition And Structure ◽  
Steel Substrates

Synthesis of poly(o-phenylenediamine) (PoPD) and poly(o-phenylenediamine)-ZnO (PoPD-ZnO) nanocomposites on carbon steel by in-situ polymerization with HCl acid as doping acid Material coating. The composition and structure of PoPD-ZnO nanocomposites were characterized by Fourier transform infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM). The corrosion protection ability of polymer coatings in 3.5% NaCl was studied by potentiodynamic polarization curves and electrochemical impedance spectroscopy. It can be seen from the electrochemical corrosion experimental data that PoPD-WPU coating (PWC) and PoPD-ZnO-WPU coating (PZWC) can effectively improve the corrosion resistance of the carbon steel substrate, and the corrosion rate is reduced by 2-3 orders of magnitude compared with carbon steel. The conclusion demontrates that PoPD can effectively extend the service life of carbon steel substrates. In addition, it is advantageous to form a compact and low-defect coating when added nano-particle ZnO, which is advantageous for the POPD film to develop its good barrier property and corrosion resistance.

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