Corrosion resistance of CaO–Al2O3–SiO2 glasses used for flame spraying on concrete

2020 ◽  
Vol 61 (1) ◽  
pp. 11-20
Author(s):  
Felix Eiwen ◽  
J.-H. Pfeiler ◽  
C. Roos
Keyword(s):  
Corrosion Resistance ◽  
Acid Resistance ◽  
Concrete Surface ◽  
Flame Spraying ◽  
Protection Measures ◽  
Thin Glass ◽  
Protective Layers ◽  
Service Lifetime ◽  
Alkaline Resistance ◽  
Free Glass

Concrete components can severely suffer from corrosion during their service lifetime. To achieve higher durability, glass coatings can be applied onto the concrete surface for protection purposes. Current solutions for protection measures are either sticking thin glass panes onto the concrete or applying plastic layers using flame spraying. The aim of this work was to develop an optimised glass composition for protective layers, in order to be suitable for flame spraying on concrete. The main advantage of this process is the deposition of continuous and joint-free glass layers onto complex geometries. Dense glass layers provide a much higher corrosion resistance and lifetime compared to polymer layers. The challenge encountered by these glass coatings resides in the contact with strong acidic fluids on one side and with the alkaline concrete on the other. Therefore, a new glass appropriate for flame spraying has been developed. The composition of this glass is cheaper compared to established reference glass products while providing comparable alkaline resistance. As the acid resistance of this glass is not sufficient, in order to ensure the desired requirements of an adequate corrosion protection, a multilayer glass coating was developed, in which the first layer consists of the alkaline-resistant CaO–Al2O3–SiO2 glass and the second layer of an acid-resistant glass.

scholarly journals Corrosion resistance of steel reinforcement in polymer silicate shyngizite concrete

2020 ◽  
Vol 164 ◽  
pp. 02032
Author(s):  
Irina Sokolova
Keyword(s):  
Corrosion Resistance ◽  
Physical And Mechanical Properties ◽  
Acid Resistance ◽  
Concrete Surface ◽  
Steel Reinforcement ◽  
Operating Environment ◽  
High Acid ◽  
Industrial Buildings ◽  
Wet Gas ◽  
Additional Protection

Polymersilicate concrete is used for structures of industrial buildings in many industries, where production processes form an acidic wet- gas operating environment. The lightweight polymer silicate shungizite concrete, proposed by the author for external walls, can also be attributed to these materials. The polymersilicate composition is based on the components of schungite and schungizite. The composition also included liquid glass, sodium silicofluoride and furyl alcohol. These ingredients are usually adopted for polymersilicate concrete. Previously, the author carried out the research of physical and mechanical properties of the composition. The components based on schungite and schungizite were chosen because of their high acid resistance. The issue of the corrosion resistance of reinforcement in light polymer-silicate concrete has not been studied enough. This article presents the results of investigations of the corrosion resistance of steel reinforcement in polymer silicate shungizit concrete. The investigations were carried out in an airy environment of high humidity and in solutions of sulfuric acid of various concentrations. After the established time limits for corrosion testing, the corrosion of reinforcement in samples was not observed. Such a result was obtained due to the dense structure of the material and high acid resistance of the constituent components on the basis of schungite and shungizite. There is no need for additional protection of the concrete surface to prevent corrosion of the reinforcement in it . The author recommends the use of the material for reinforced structures of external walls exposed to an acidic wet- gas operating environment.

scholarly journals One-Step Preparation of Hyperbranched Polyether Functionalized Graphene Oxide for Improved Corrosion Resistance of Epoxy Coatings

Coatings ◽  
2019 ◽  
Vol 9 (12) ◽  
pp. 844 ◽  
Author(s):  
Xuepei Miao ◽  
An Xing ◽  
Lifan He ◽  
Yan Meng ◽  
Xiaoyu Li
Keyword(s):  
Corrosion Resistance ◽  
Graphene Oxide ◽  
Acid Resistance ◽  
Epoxy Coating ◽  
Functionalized Graphene ◽  
Step Method ◽  
Epoxy Coatings ◽  
Functionalized Graphene Oxide ◽  
One Step ◽  
Hyperbranched Polyether

In this paper, hyperbranched polyether functionalized graphene oxide (EHBPE-GO) was prepared by a facile one-step method. Fourier transform infrared spectroscopy (FTIR), X-ray diffractometry (XRD), thermogravimetric analyzer (TGA), and trans-mission electron microscopy (TEM) results confirmed the formation of EHBPE-GO. Then, EHBPE-GO was cured with phenolic amides at room temperature to prepare epoxy coatings. The corrosion resistance of epoxy coatings was investigated systematically by using electrochemical and traditional immersion methods. Results show that a small amount of EHBPE-GO (8 wt % of Diglycidyl ether of bisphenol A (DGEBA)) in epoxy coating achieves 50% higher improvement in acid-resistance than unmodified neat DGEBA resin. For the nanocomposite epoxy coating, the superior acid-resistance is attributed to the increased crosslink density and the impermeable 2D structure of EHBPE-GO. This work provides a facile strategy to develop the effective improved corrosion resistance nanofiller for epoxy coating.

Corrosion Resistance of VC–FeCr and VC–FeCrСо Coatings Obtained by Supersonic Gas-Flame Spraying

2019 ◽  
Vol 54 (4) ◽  
pp. 535-541 ◽  
Author(s):  
М. М. Student ◽  
H. V. Pokhmurs’ka ◽  
Kh. R. Zadorozhna ◽  
H. H. Veselivs’ka ◽  
V. М. Hvozdets’kyi ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Flame Spraying ◽  
Gas Flame

Application of Supersonic Flame Spraying for Next Generation Cylinder Liner Coatings

2012 ◽  
Vol 533 ◽  
pp. 91-97 ◽  
Author(s):  
Andrei Manzat ◽  
A. Killinger ◽  
R. Gadow
Keyword(s):  
Corrosion Resistance ◽  
Surface Topography ◽  
High Performance ◽  
Combustion Engine ◽  
Cylinder Liner ◽  
Flame Spraying ◽  
Oil Consumption ◽  
Functional Coatings ◽  
Coating Materials ◽  
Cylinder Liners

Rising demands for ecologically friendly automotive engines require a significant decrease in fuel consumption and emissions. Also the recent trend of downsizing engines demands for high performance materials for internal combustion engine applications. Tribologically functional coatings applied by supersonic flame spraying help in boosting the engine efficiency by reducing the internal friction and improving the durability and wear resistance of the cylinder running surface much-needed for engine downsizing tasks together with a high corrosion resistance enabling the use of bio fuels. In addition, the tailored surface topography of the thermal spray coatings help in supporting advantageous friction states and thereby show the benefit of reducing the oil consumption resulting in reduced emissions. The thermally sprayed coatings were applied using HVOF and HVSFS processes together with a specially designed spray gun trajectory in order to achieve a fast and cost efficient coating procedure. Several different coating materials, including novel nanostructured powders, have been investigated and compared to state-of-the-art cylinder liners. The performance of the coated cylinder liners regarding wear and corrosion resistance, friction coefficient and effects of the surface topography have been investigated in various test setups including engine tests.

Applying Thermoplastic Powder by Flame Spraying on Various Types of Substrates

1996 ◽  
Author(s):  
R. Dominguez ◽  
F. Monerie ◽  
A. Vardelle ◽  
P. Fauchais
Keyword(s):  
Corrosion Resistance ◽  
Friction Coefficient ◽  
Erosion Resistance ◽  
Flame Spraying ◽  
Controlled Atmosphere ◽  
Polymeric Coatings ◽  
Low Friction ◽  
Ceramic Particles

Abstract Polymeric coatings are now widely used for their corrosion resistance, low friction coefficient against many materials, decorative properties but also, when doped with ceramic particles, their protection against slipping and their good erosion resistance. Compared to traditional means of deposition, flame spraying in controlled atmosphere extends the scope of their applications either for shapes that can be coated or for site deposition. The materials chosen for spraying were Rislan, Gotalene and Tefzel. In this paper are presented the flame spraying technique which was used and the parameters controlling particles melting as well as, the substrates on which coatings were achieved (metals, woods, concretes, ceramics...) and their preparation. A few applications are then described with for example coatings reinforced by ceramic particles against slipping in wet or greasy area.

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.

Influence of Additional Alloying Elements on Corrosion Resistance of Hot Dip Galvanised Steels

2012 ◽  
Vol 730-732 ◽  
pp. 811-816 ◽  
Author(s):  
Alexandru Alexa ◽  
Tamara Radu ◽  
Florentina Potecasu ◽  
Anisoara Ciocan
Keyword(s):  
Corrosion Resistance ◽  
Diffusion Process ◽  
Dip Coating ◽  
Alloying Elements ◽  
Coating Process ◽  
Accelerated Corrosion ◽  
Protective Layers ◽  
Galvanized Steels ◽  
Simulated Environment ◽  
Improved Performance

The alloying of the zinc with some additional elements in specific quantities could be reliably used in the hot-dip coating process. These elements form specific intermetallic compounds that conferred substantially improved performance to the end-product specially by improving of the corrosion resistance. The paper presents the research that has developed to analyze the influence of aluminum, bismuth and tin like alloying elements added in the zinc on corrosion resistance of galvanized steels. Steel samples were galvanized by the hot-dip method in micro-alloyed zinc baths. The influence of the alloying elements on the formation of the different phases and on the diffusion process is discussed. The corrosion experiments were carried out in a simulated environment of accelerated corrosion conditions. The kinetics and the mechanism of corrosion of the samples were studied in correlation with the effect of alloying elements on nature and characteristics of protective layers.

scholarly journals Evaluation of morphology, wear and corrosion resistance of ZrO 2 -Al 2 O 3 /Ni coatings deposited on carbon steel substrates with flame spraying

2017 ◽  
Vol 25 (4) ◽  
pp. 721-732
Author(s):  
Martha Yasmid Ferrer Pacheco ◽  
Fabio Vargas Galvis ◽  
Enrique Vera López ◽  
Carlos Mauricio Moreno Téllez ◽  
Gabriel Peña Rodríguez
Keyword(s):  
Corrosion Resistance ◽  
Carbon Steel ◽  
Flame Spraying ◽  
Wear And Corrosion ◽  
Wear And Corrosion Resistance ◽  
Steel Substrates

Basic Directions of Improving the Durability of the Sewage Collector Lining

2016 ◽  
Vol 843 ◽  
pp. 25-32 ◽  
Author(s):  
Elena Kulikova
Keyword(s):  
Corrosion Resistance ◽  
Mechanical Strength ◽  
Abrasive Wear ◽  
Water Resistance ◽  
Concrete Surface ◽  
External Factors ◽  
Concrete Lining ◽  
Cement Ratio ◽  
Aggressive Environment ◽  
Urban Construction

The main requirements for the sewage lining are waterproofing properties, mechanical strength, corrosion resistance, resistance to hydro-abrasive wear. Currently, neither in the literature nor in the practice of underground urban construction, there is no information about the quantitative parameters of the above requirements. This leads to uncertainty when creating new means of protection of concrete lining from the effects of external factors and aggressive media flowing through the collector tunnels. Currently, it is possible to control the characteristics of concrete (to increase its density and decrease porosity) through the introduction of additives (superplasticizers to reduce the water-cement ratio, microsilica) or coating of concrete surface materials, contributing to colmatation. It helps to increase the water resistance of concrete tunnel lining, its resistance to aggressive influences. However, this is not enough to prevent deterioration of concrete when exposed to aggressive environment. The article proposed the evaluation of the above requirements, which will solve the problem of increasing the durability of lining concrete sewers.

Microstructural, Mechanical Properties and Corrosion Resistance of Ferritic Stainless Steel Welded by GTAW and Coated by Flame Spraying

2015 ◽  
Vol 1765 ◽  
pp. 1-9
Author(s):  
J. Delgado-Venegas ◽  
A. Molina-Díaz ◽  
R.R. Ambriz-Rojas ◽  
R. Cuenca-Álvarez
Keyword(s):  
Mechanical Properties ◽  
Stainless Steel ◽  
Corrosion Resistance ◽  
Ferritic Stainless Steel ◽  
Heat Affected Zone ◽  
Flame Spraying ◽  
Feed Speed ◽  
Ceramic Phase ◽  
Weld Joints ◽  
Mechanical Properties And Corrosion

ABSTRACTFerritic stainless steels are widely used in transportation industry due to their exceptional performance regarding mechanical and corrosion properties. However, after a welding process, joints feature the sensitizing phenomenon because of the heat exchange from the torch affecting mechanical properties and corrosion resistance. This work describes the behavior firstly of mechanical properties of weld joints of ferritic stainless steel as base material without and with filler material (AISI 308L) by gas tungsten arc welding (GTAW). Operating parameters such as arc voltage, welding currrent, welding speed, feed speed, shielding gas flow were evaluated. Secondly, samples of weld joints were coated by flame spraying of composite particles in order to reduce the weight loss induced by corrosion in a salt spray (fog) apparatus. Changes induced from GTAW on the heat affected zone and Thermal Spraying on corrosion resistance, were monitored by optical and scanning electron microscopy, microhardness and longitudinal tensile testing. Results show that GTAW helps to control the size and the microstructure of heat affected zone improving simultaneously the mechanical properties. Meanwhile, welded joints covered by composite coatings feature a lower damage provided that the ceramic phase has been homogeneously dispersed.

Sign in / Sign up

Export Citation Format

Share Document