RESEARCH OF EROSION RESISTANCE OF SOLDERED JOINTS WITH PROTECTIVE COATINGS

2021 ◽  
pp. 67-74
Author(s):  
D.S. Kashin ◽  
◽  
I.M. Ivanov ◽  
O.N. Doronin ◽  
◽  
...  
Keyword(s):  
Tungsten Carbide ◽  
Erosion Resistance ◽  
Protective Coatings ◽  
Positive Influence ◽  
Electrospark Coating

Presents results of studies of the erosion resistance of soldered joints with various types of coatings. It was established that a coating based on tungsten carbide, applied by the electrospark method, has the greatest positive influence on the erosion resistance of VPr4 solder. At the same time, preliminary machining of the solder surface also increases resistance to the effects of erosion flow. The possibility of using an electrospark coating as an erosion-resistant sublayer for composite protective coatings was shown.

Composite cladded powders for spraying of protective coatings

2019 ◽  
pp. 59-64
Author(s):  
E. Yu. Gerashchenkova ◽  
T. I. Bobkova ◽  
E. A. Samodelkin ◽  
B. V. Farmakovsky
Keyword(s):  
Tungsten Carbide ◽  
Gas Phase ◽  
High Speed ◽  
Protective Coatings ◽  
Powder Materials ◽  
Nanosized Particles

The paper presents results of the development of technology for producing cladded and surfacealloyed powder materials. High-speed mechanosynthesis of matrix powders of FeCrAl and solid nanosized particles of tungsten carbide occurs in a disintegrator in the presence of an active gas phase (nitrogen).

scholarly journals Characterisation Method of the Passivation Mechanisms during the pre-discharge Stage of Plasma Electrolytic Oxidation Indicating the Mode of Action of Fluorides in PEO of Magnesium

Coatings ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 965
Author(s):  
Frank Simchen ◽  
Maximilian Sieber ◽  
Thomas Mehner ◽  
Thomas Lampke
Keyword(s):  
Plasma Electrolytic Oxidation ◽  
Protective Coatings ◽  
Substrate Surface ◽  
Construction Materials ◽  
Systematic Investigation ◽  
Positive Influence ◽  
Passive Layer ◽  
Electrolytic Oxidation ◽  
Anodic Polarisation ◽  
Plasma Electrolytic

Plasma electrolytic oxidation (PEO) is a method to obtain protective coatings on metallic light-weight construction materials. Here, the workpiece receives a strong anodic polarisation in a suitable aqueous electrolyte, which leads to the formation of a passive layer and a gaseous shell. Afterwards, plasma electrolytic discharges appear on the substrate surface and convert it into a ceramic layer. The properties of the passive layer are influenced by the selected substrate/electrolyte combination and are essential for the PEO process-initiation and characteristics. In this work, a new method for the systematic investigation of the substrate/electrolyte interactions during the pre-discharge stage is presented. The procedure is carried out by a polarisation experiment and allows for a quantitative characterisation of the passivation behavior, based on a small electrolyte volume. The method is used to investigate a literature-known electrical conduction mechanism on passive films formed on magnesium, by cross-comparison between different Mg and Al materials. In addition, the influence of phosphate, glycerol, and fluoride on the passivation behaviour of the Mg alloy AZ31 in an alkaline environment is considered and quantified. The results provide an explanatory approach for the positive influence of toxic fluorides within the electrolyte on the morphology of PEO layers on magnesium.

scholarly journals Evaluation of the Quality of Coatings Deposited on AZ31 Magnesium Alloy Using the Anodising Method / Ocena Jakości Powłok Wykonanych Na Stopie Magnezu Az31 Metodą Anodowania

2015 ◽  
Vol 60 (4) ◽  
pp. 2843-2850 ◽  
Author(s):  
J. Wieczorek ◽  
B. Oleksiak ◽  
J. Mizera ◽  
K. Kulikowski ◽  
P. Maj
Keyword(s):  
Magnesium Alloy ◽  
Electroless Plating ◽  
Erosion Resistance ◽  
Protective Coatings ◽  
Erosive Wear ◽  
Scratch Test ◽  
Az31 Magnesium Alloy ◽  
Wear Protection ◽  
Plating Method

The paper presents results of a study on the quality of coatings deposited on surfaces of AZ31 magnesium alloy products. In order to obtain protective coatings (corrosion and erosive wear protection), the methods of anodising (specimens A, B and C) and, for comparison, electroless plating (specimen D) were applied. The assessment of coating quality was based on the scratch test results. The results were used for determination of critical loads resulting in coating rupture. The best result was obtained for the specimen B (sulphuric acid anodising in combination with sealing): the critical load was 7.5 N. The smallest value (5.5 N) was observed for the specimen D, i.e. the coating produced using the electroless plating method. Moreover, erosion resistance of the coatings was assessed. In this case, a depth of the wear trace due to an erodent agent (SiC powder) effects was investigated. The results are comparable to those obtained in the scratch test. The poorest erosion resistance is demonstrated by the coating D and the best resistance is observed for the coating B.

scholarly journals Influence of the Grain Size of Tungsten Carbide in the VK8 Anode Material on the Formation of an Alloyed Layer of Steel 35

2021 ◽  
Vol 57 (5) ◽  
pp. 13-19
Author(s):  
A.A. Burkov ◽  
◽  
L.A. Konevtsov ◽  
M.I. Dvornik ◽  
N.M. Vlasova ◽  
...  
Keyword(s):  
Mass Transfer ◽  
Grain Size ◽  
Tungsten Carbide ◽  
Anode Material ◽  
Anode Materials ◽  
Erosion Resistance ◽  
Kinetic Studies ◽  
Substrate Material ◽  
Average Grain Size ◽  
Processing Modes

The influence of the grain size of tungsten carbide of tungsten-cobalts hard alloy, received as anode material for the electro-spark deposition (ESD) of steel 35, on its erosion resistance, on the weight gain of the substrate material, and on the coefficient of electro-mass transfer. It is shown that in the preparation of new anode materials with different structure, density, porosity, fracture strength, and grain size of tungsten carbide, a pressing charge with additives of 0.4% Cr3C2–0.4% VC grain growth inhibitors and grinding in alcohol and argon atmosphere at a grinding time of 20 to 320 minutes was used. The results of the erosion resistance and the use of the obtained new anode materials in the ESD of steel 35 are shown. When performing kinetic studies, a number of indicators of the efficiency of the formation of the doped layer were identified, taking into account the obtained values of the of additional weight of the cathode, the time of the ESD, the specific surface area of 1 cm2, and the coefficient of electro-mass transfer at the ESD of the studied anode materials. The results of the studies of the structure, thickness, composition of the doped layer, and of the heat resistance and wear resistance of the coating are shown. It was revealed that among the created new anode materials, the best oxidation resistance of the coating after ESD with the selected processing modes were obtained using a new nanodispersed anode material WC8%Co–0.4%Cr3C2–0.4%VC, with an average grain size of 0.8 microns WC.

The Composite Materials for High Erosion Resistance Coatings Applied in Power Industry

2016 ◽  
Vol 246 ◽  
pp. 127-130
Author(s):  
Bożena Szczucka-Lasota ◽  
Krzysztof Szymański ◽  
Jan Piwnik
Keyword(s):  
Composite Materials ◽  
Erosion Resistance ◽  
Protective Coatings ◽  
Thermal Spraying ◽  
Innovative Technology ◽  
Power Plant Boiler ◽  
Corrosion Resistant Coatings ◽  
Spraying Process ◽  
Spraying Method ◽  
Plant Boiler

The article presents the issues related to composite materials and the fabrication process of protective coatings by thermal spraying methods used for the protection of power plant boiler elements . The basic composite materials for thermal spraying process were characterized. The presented materials allow produced the erosion-corrosion resistant coatings. The chemical composition, phase structure and properties of the selected materials are presented. The basic group of coatings with the high corrosion and erosion resistance are produced by thermal spraying method, like HVOF (High velocity oxy fuel). In this article the selected properties of composite materials sprayed by innovative technology are characterized.

Low-Temperature Chemical Vapor Deposition Tungsten Carbide Coatings for Wear/Erosion Resistance

1992 ◽  
Vol 75 (4) ◽  
pp. 1008-1011 ◽  
Author(s):  
Diwakar Garg ◽  
Paul N. Dyer ◽  
Duane B. Dimos ◽  
Swaminathan Sunder ◽  
Hans E. Hintermann ◽  
...  
Keyword(s):  
Chemical Vapor Deposition ◽  
Low Temperature ◽  
Tungsten Carbide ◽  
Vapor Deposition ◽  
Erosion Resistance ◽  
Chemical Vapor ◽  
Carbide Coatings

scholarly journals Influence of structural graphite surface electrospark machining conditions on erosion resistance

2019 ◽  
pp. 51-56
Author(s):  
L. S. Belozerov ◽  
A. A. Kazin ◽  
S. G. Kuptsov
Keyword(s):  
Erosion Resistance ◽  
Graphite Surface ◽  
Electrospark Coating ◽  
Structural Graphite ◽  
Machining Conditions ◽  
Electrospark Machining

The study deals with the erosion resistance of graphite samples with an electrospark coating surfaced in different conditions. The purpose of the study was to identify the coating of better quality. During the experiment, three metals were used as the anode: tungsten, titanium, and vanadium. For erosivity, plasmatron was used

Corrosion and erosion resistance of steels with certain protective coatings

1974 ◽  
Vol 8 (4) ◽  
pp. 474-475
Author(s):  
A. A. Domio ◽  
V. P. Bezruchko ◽  
E. P. Ponomarenko ◽  
V. I. Pokhmurskii ◽  
G. P. Grigorchuk
Keyword(s):  
Erosion Resistance ◽  
Protective Coatings
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