scholarly journals Durability of Polymer Powder Coatings

2021 ◽  
Vol 346 ◽  
pp. 02043
Author(s):  
Vladimir Fedyaev ◽  
Engel Galimov ◽  
Alexey Belyaev ◽  
Liliya Sirotkina
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Adhesive Strength ◽  
Operating Time ◽  
Coating Material ◽  
Powder Coatings ◽  
Integral Criterion ◽  
Polymer Powder ◽  
Composition And Structure ◽  
The Impact

The durability of polymer powder coatings is considered. The features of the impact on coatings during their operation of the environment, loads from the side of the substrate on the surface of its contact with the coatings, parameters that depend on the chemical composition and structure of the coating material are briefly analyzed. The thickness of the coating stands out as the main indicators of durability; a function that characterizes the continuity, strength, corrosion resistance, and its other properties; adhesive strength. It is proposed to use a generalized (integral) criterion for a comprehensive accounting of these indicators. An equation is written to assess the durability of the considered coatings, in a particular case, a formula is given for calculating their permissible operating time.

scholarly journals Glass-Forming Ability and Corrosion Resistance of Al88Y8−xFe4+x (x = 0, 1, 2 at.%) Alloys

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1581
Author(s):  
Rafał Babilas ◽  
Monika Spilka ◽  
Katarzyna Młynarek ◽  
Wojciech Łoński ◽  
Dariusz Łukowiec ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Analytical Techniques ◽  
Corrosion Current ◽  
Glass Forming Ability ◽  
Electrochemical Tests ◽  
Glass Forming ◽  
Transmission Electron ◽  
Composition And Structure ◽  
Amorphous Structures ◽  
The Impact

The effect of iron and yttrium additions on glass forming ability and corrosion resistance of Al88Y8-xFe4+x (x = 0, 1, 2 at.%) alloys in the form of ingots and melt-spun ribbons was investigated. The crystalline multiphase structure of ingots and amorphous-crystalline structure of ribbons were examined by a number of analytical techniques including X-ray diffraction, Mössbauer spectroscopy, and transmission electron microscopy. It was confirmed that the higher Fe additions contributed to formation of amorphous structures. The impact of chemical composition and structure of alloys on their corrosion resistance was characterized by electrochemical tests in 3.5% NaCl solution at 25 °C. The identification of the mechanism of chemical reactions taking place during polarization test along with the morphology and internal structure of the surface oxide films generated was performed. It was revealed that the best corrosion resistance was achieved for the Al88Y7Fe5 alloy in the form of ribbon, which exhibited the lowest corrosion current density (jcorr = 0.09 μA/cm2) and the highest polarization resistance (Rp = 96.7 kΩ∙cm2).

The Effect of Chemical Composition and Structure on the Corrosion Resistance of Plated Aluminium Alloy Strips

2012 ◽  
pp. 451-457
Author(s):  
Andrzej Klyszewski ◽  
Janusz Zelechowski ◽  
Mieczyslaw Opyrchal ◽  
Marek Nowak ◽  
Andrzej Frontczak ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Aluminium Alloy ◽  
Composition And Structure

The Impact of Zinc Coating Specifications on Corrosion Resistance аnd Durability of Steels

2019 ◽  
Vol 945 ◽  
pp. 740-745
Author(s):  
I.A. Kovalenko ◽  
D.V. Laskin ◽  
A.Y. Trifonova
Keyword(s):  
Corrosion Resistance ◽  
Statistical Analysis ◽  
Chemical Composition ◽  
Service Life ◽  
Zinc Coating ◽  
Useful Life ◽  
Galvanized Coating ◽  
Zinc Coatings ◽  
The Impact ◽  
High Chloride

The article contains the findings on impact of zinc coating specifications on corrosion resistance and service life of steels of various chemical composition used often in modern industries. Characteristics such as type, class, chemical compound and thickness of zinc-based coatings are also addressed. Experiments were performed in which corrosion rate and useful life of zinc coatings in probable operating-like conditions — i.e., in environments of varying degrees of corrosive power (humid and high-chloride environments) were determined. It has been established which one of the environments is the most corrosive for steels depending on the zinc-based coatings’ specifications. Qualitative (visual) and quantitative (gravimetric) assessment of corrosion resistance and service life of chosen steels is presented. Optimal hot dip galvanized coating specifications were determined using statistical analysis.

Effect of the Chemical Composition and Structure of High-Chromium-Nitrogen Steels on Their Corrosion Resistance

2003 ◽  
Vol 45 (9/10) ◽  
pp. 385-389 ◽  
Author(s):  
A. V. Elistratov ◽  
V. M. Blinov ◽  
A. G. Rakhshtadt ◽  
A. A. Aliev ◽  
A. N. Malofeeva ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
High Chromium ◽  
Composition And Structure ◽  
Nitrogen Steels

Effects of thermal maturity and chemical composition of kerogen on its dielectric constant

Geophysics ◽  
2020 ◽  
Vol 85 (1) ◽  
pp. D53-D64
Author(s):  
Archana Jagadisan ◽  
Zoya Heidari
Keyword(s):  
Dielectric Constant ◽  
Dielectric Properties ◽  
Chemical Composition ◽  
Photoelectron Spectroscopy ◽  
Thermal Maturity ◽  
Formation Evaluation ◽  
Heat Treated ◽  
Composition And Structure ◽  
Physical And Chemical ◽  
The Impact

Reliable formation evaluation using borehole geophysical measurements in organic-rich mudrocks requires knowledge about the physical properties of kerogen. For instance, estimates of water-filled pore volume are significantly affected by the assumptions made for dielectric permittivity of kerogen, which can be influenced by thermal maturity. However, the impact of thermal maturity of pure kerogen on its dielectric properties is not yet thoroughly understood. We quantify the dielectric constant of kerogen samples extracted from three formations, with different levels of natural thermal maturity, and we identify the impact of thermal maturity on their dielectric properties. We first isolate kerogen from mudrock samples using physical and chemical treatments. We then synthetically mature the samples in a controlled environment and measure their dielectric constant (at 1 GHz) using a microwave resonator. X-ray photoelectron spectroscopy (XPS) monitors the variation in chemical composition of kerogen. The dielectric constant of the kerogen samples varied significantly in the range of 1.89–3.2 upon being heat treated from 25°C to 650°C. The variation in the dielectric constant is explained by the alteration in the chemical composition and structure of kerogen as a result of thermal maturation. XPS measurements also showed an increase in aromatic carbon content in the kerogen samples as the thermal maturity increased. The documented results enable the integration of the kerogen geochemistry to the interpretation of dielectric measurements, which contributes to improved interpretation of dielectric logs in organic-rich mudrocks, and result in enhanced formation evaluation of these reservoirs.

Corrosion Resistance of Inconel 625 and Austenitic Steel M41 after Laser Claddings

2015 ◽  
Vol 647 ◽  
pp. 115-120
Author(s):  
Stanislav Němeček ◽  
Lukáš Fiedler ◽  
Pavla Fišerová
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Chemical Analysis ◽  
Substrate Temperature ◽  
Austenitic Steel ◽  
Microscopic Observation ◽  
Steel Substrate ◽  
Inconel 625 ◽  
Profound Impact ◽  
The Impact

<span><p><span lang="DE">The present paper explores the impact of laser cladding parameters on the corrosion behavior of the resulting surface. Powders of Inconel 625 and austenitic Metco <st1:metricconverter w:st="on" productid="41C">41C</st1:metricconverter> steel were deposited on steel substrate. It was confirmed that the level of dilution has profound impact on the corrosion resistance and that dilution has to be minimized. However, the chemical composition of the cladding is altered even in the course of the cladding process, a fact which is related to the increase in the substrate temperature. The cladding process was optimized to achieve maximum corrosion resistance. The results were verified and validated using microscopic observation, chemical analysis and corrosion testing. </span></p>

scholarly journals COMPOSITION AND STRUCTURE OF COMPOSITE COATINGS BASED ON METAL OXIDES AND POLYTETRAFLUOROETHYLENEDEPOSITED UNDER CONDITIONS OF ELECTRON-INITIATED ENDOTHERMIC PROCESSES

2020 ◽  
Vol 17 (2) ◽  
pp. 31-38
Author(s):  
А.P. Surzhikov ◽  
Keyword(s):  
Chemical Composition ◽  
Composite Coatings ◽  
Electron Flow ◽  
Mechanical Mixture ◽  
Iron Nitrate ◽  
Exothermic Reactions ◽  
Composition And Structure ◽  
Volatile Products ◽  
The Impact ◽  
Dispersed Aluminum

In this article features of physicochemical processes initiated by the low-energy electron flow between the components of the target based on nitrates of metals and metals, their influence on the kinetics of the formation of volatile products, the chemical composition and structure of the deposited coatings are established. When electrons act on a mixture of aluminum nitrate and dispersed aluminum, zinc oxide coatings containing zinc nanorods are formed. The impact of the electron flow on a mechanical mixture of powders of iron nitrate and dispersed aluminum is accompanied by explosive evaporation of the target, and a large number of microdroplet formations deposited at the final stage of exothermic reactions in the surface layers of the target are fixed on the surface of the coating containing oxides and metal nanoparticles. The features of the structure and chemical composition of coatings deposited from the volatile products of electron beam dispersion of a mechanical mixture of polytetrafluoroethylene, iron nitrate, and aluminum are determined. It is shown that under such conditions of generation of the gas phase, coatings are formed consisting of a polymer matrix and containing particles of oxide, a free metal, and a certain amount of the initial undecomposed salt. The result of exothermic reactions in the crucible is partial defluorination and increased defectiveness of the molecular structure of the fluoroplastic matrix.

The Effect of Chemical Composition and Structure on the Corrosion Resistance of Plated Aluminium Alloy Strips

2012 ◽  
pp. 451-457 ◽  
Author(s):  
Andrzej Klyszewski ◽  
Janusz Zelechowski ◽  
Mieczyslaw Opyrchal ◽  
Marek Nowak ◽  
Andrzej Frontczak ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Chemical Composition ◽  
Aluminium Alloy ◽  
Composition And Structure

scholarly journals Impact of the Allowed Compositional Range of Additively Manufactured 316L Stainless Steel on Processability and Material Properties

Materials ◽  
2021 ◽  
Vol 14 (15) ◽  
pp. 4074
Author(s):  
Felix Großwendt ◽  
Louis Becker ◽  
Arne Röttger ◽  
Abootorab Baqerzadeh Chehreh ◽  
Anna Luise Strauch ◽  
...  
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Additive Manufacturing ◽  
Chemical Composition ◽  
316L Stainless Steel ◽  
Nickel Content ◽  
Equivalent Ratio ◽  
Compositional Range ◽  
The Impact ◽  
Nickel Equivalent

This work aims to show the impact of the allowed chemical composition range of AISI 316L stainless steel on its processability in additive manufacturing and on the resulting part properties. ASTM A276 allows the chromium and nickel contents in 316L stainless steel to be set between 16 and 18 mass%, respectively, 10 and 14 mass%. Nevertheless, the allowed compositional range impacts the microstructure formation in additive manufacturing and thus the properties of the manufactured components. Therefore, this influence is analyzed using three different starting powders. Two starting powders are laboratory alloys, one containing the maximum allowed chromium content and the other one containing the maximum nickel content. The third material is a commercial powder with the chemical composition set in the middle ground of the allowed compositional range. The materials were processed by laser-based powder bed fusion (PBF-LB/M). The powder characteristics, the microstructure and defect formation, the corrosion resistance, and the mechanical properties were investigated as a function of the chemical composition of the powders used. As a main result, solid-state cracking could be observed in samples additively manufactured from the starting powder containing the maximum nickel content. This is related to a fully austenitic solidification, which occurs because of the low chromium to nickel equivalent ratio. These cracks reduce the corrosion resistance as well as the elongation at fracture of the additively manufactured material that possesses a low chromium to nickel equivalent ratio of 1.0. A limitation of the nickel equivalent of the 316L type steel is suggested for PBF-LB/M production. Based on the knowledge obtained, a more detailed specification of the chemical composition of the type 316L stainless steel is recommended so that this steel can be PBF-LB/M processed to defect-free components with the desired mechanical and chemical properties.

Survey of Relations of Chemical Constituents in Polymer-Based Materials with Brittleness and its Associated Properties

2016 ◽  
Vol 10 (4s) ◽  
pp. 595-600 ◽  
Author(s):  
Witold Brostow ◽  
◽  
Haley E. Hagg Lobland ◽  
Keyword(s):  
Chemical Composition ◽  
Impact Strength ◽  
Free Volume ◽  
Chemical Constituents ◽  
Polymer Processing ◽  
Brittle Behavior ◽  
Composition And Structure ◽  
Common Thread

The property of brittleness for polymers and polymer-based materials (PBMs) is an important factor in determining the potential uses of a material. Brittleness of polymers may also impact the ease and modes of polymer processing, thereby affecting economy of production. Brittleness of PBMs can be correlated with certain other properties and features of polymers; to name a few, connections to free volume, impact strength, and scratch recovery have been explored. A common thread among all such properties is their relationship to chemical composition and morphology. Through a survey of existing literature on polymer brittleness specifically combined with relevant reports that connect additional materials and properties to that of brittleness, it is possible to identify chemical features of PBMs that are connected with observable brittle behavior. Relations so identified between chemical composition and structure of PBMs and brittleness are described herein, advancing knowledge and improving the capacity to design new and to choose among existing polymers in order to obtain materials with particular property profiles.

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