scholarly journals Coating based on basalt protection metal structures

Tehnika ◽  
2021 ◽  
Vol 76 (3) ◽  
pp. 302-307
Author(s):  
Marko Pavlović ◽  
Marina Dojčinović ◽  
Ljubiša Andrić ◽  
Dragan Radulović ◽  
Ljiljana Trumbulović
Keyword(s):  
Protective Coatings ◽  
Surface Damage ◽  
Sample Surface ◽  
Small Mass ◽  
Test Results ◽  
Organic Additives ◽  
Refractory Coating ◽  
Metal Structures ◽  
Basalt Rock ◽  
Morphology Of Surface

The paper present the results of the synthesis of a new refractory coating based on basalt for the protection of metal construction under conditions of cavitation. Initial basalt samples obtained from the locality Vrelo - Kopaonik. The basalt based refractory filler was obtained by crushing and grinding selected samples of basalt rock. XRD, SEM and optical microscopy methods were used to characterize the obtained filler samples. The research defined the composition of basalt -based coating with epoxy resinbased binder, organic additives and organic solvent. The resistance properties of protective coatings applied to metal surface were investigated using the ultrasonic vibration method with a stationary sample according to the ASTM G 32 standard. To evaluate the resistance of the sample surface to the action of cavitation, the sample surface was examined before and during testing. The surface of the samples was monitored by scanning electron microscopy in order to analyze the morphology of surface damage. Computer image analysis according to the Image Pro Plus program was applied to assess the damage to the sample surface. The obtained test results showed high resistance of the coating layers to the effect of cavitation, with small mass losses, small damage to the coating surface and a cavitation rate of 0,1 mg/min.

Study of the effect of test parameters on the assessment of steel resistance to carbon dioxide corrosion

2021 ◽  
Vol 87 (12) ◽  
pp. 36-41
Author(s):  
A. S. Fedorov ◽  
E. L. Alekseeva ◽  
A. A. Alkhimenko ◽  
N. O. Shaposhnikov ◽  
M. A. Kovalev
Keyword(s):  
Carbon Dioxide ◽  
Laboratory Tests ◽  
Oil And Gas ◽  
Oil And Gas Industry ◽  
Sample Surface ◽  
Test Results ◽  
Carbon Dioxide Corrosion ◽  
Gas Industry ◽  
Test Parameters ◽  
Repeatability And Reproducibility

Carbon dioxide (CO2) corrosion is one of the most dangerous types of destruction of metal products in the oil and gas industry. The field steel pipelines and tubing run the highest risk. Laboratory tests are carried out to assess the resistance of steels to carbon dioxide corrosion. However, unified requirements for certain test parameters are currently absent in the regulatory documentation. We present the results of studying the effect of the parameters of laboratory tests on the assessment of the resistance of steels to CO2 corrosion. It is shown that change in the parameters of CO2 concentration, chemical composition of the water/brine system, the buffer properties and pH, the roughness of the sample surface, etc., even in the framework of the same laboratory technique, can lead in different test results. The main contribution to the repeatability and reproducibility of test results is made by the concentration of CO2, pH of the water/brine system, and surface roughness of the samples. The results obtained can be used in developing recommendations for the choice of test parameters to ensure a satisfactory convergence of the results gained in different laboratories, as well as in elaborating of a unified method for assessing the resistance of steels to carbon dioxide corrosion.

scholarly journals Microstructure of Silicon Nitride Ceramics and Morphology of Surface Damage Induced by Round Indenter

1994 ◽  
Vol 102 (1184) ◽  
pp. 350-354
Author(s):  
Yasuo UCHIYAMA ◽  
Kyozo SAHARA ◽  
Huiming CHENG ◽  
Kazuo KOBAYASHI ◽  
Sigetaka WADA ◽  
...  
Keyword(s):  
Silicon Nitride ◽  
Surface Damage ◽  
Nitride Ceramics ◽  
Morphology Of Surface

The apparent effect of sample surface damage on the dielectric parameters of GaAs

2007 ◽  
Vol 401-402 ◽  
pp. 238-241 ◽  
Author(s):  
J.A.A. Engelbrecht ◽  
N.G. Hashe ◽  
K.T. Hillie ◽  
C.H. Claassens
Keyword(s):  
Surface Damage ◽  
Sample Surface ◽  
Apparent Effect ◽  
Dielectric Parameters

Composite repair of sub-sea pipelines

2011 ◽  
Vol 51 (2) ◽  
pp. 729
Author(s):  
Colin Wood ◽  
Karen Kozielski ◽  
Wendy Tian ◽  
Song Gao ◽  
Jonathan Hodgkin ◽  
...  
Keyword(s):  
Oil And Gas ◽  
Prolonged Exposure ◽  
Mechanical Test ◽  
Extended Period ◽  
Mechanical Analysis ◽  
Test Results ◽  
Metal Structures ◽  
Oil And Gas Fields ◽  
Gas Fields ◽  
Safety And Environment

The development of new deepwater oil and gas fields provide an opportunity for increased use of new materials. Conventional infrastructure is constructed using significant quantities of steel and concrete, which is becoming less practical in comparison to new light weight, easy to handle composites. When infrastructure needs to be repaired, there is often a requirement for underwater welding, which carries considerable occupational health, safety and environment (OHSE) risks. For this reason, moving away from traditional metal structures or repair technologies is increasingly attractive. In recent years a number of new water activated composite wrap materials have been developed for use in underwater applications. The materials properties that are required can be difficult to achieve and maintain over an extended period of exposure to the marine environment, though, so many research groups are working on this challenge. A comprehensive literature review has been undertaken to identify present state of the art ideas for the development of improved underwater materials and this will be discussed in the context of adhesive applications. Preliminary material characterisation work will be described where new resins have been formulated to perform well in marine environments and survive prolonged exposure to seawater. Experiments were carried out in artificial seawater and samples left to cure at a range of temperatures DSC and dynamic mechanical analysis (DMTA) were used to evaluate the crosslink density of the network and the glass transition temperature respectively, while FTIR was used to determine the chemical structure in the cured systems. Preliminary mechanical test results have shown significant improvement in strength for the new formulations compared to a set of control samples of commercially available materials.

scholarly journals Surface preparation as one of the main factors for ensuring the durability of anti-corrosion coatings

2020 ◽  
Vol 7 (2) ◽  
Author(s):  
Aleksei Bezgodov ◽  
Ilya Ovchinnikov
Keyword(s):  
Surface Treatment ◽  
Protective Coatings ◽  
Surface Preparation ◽  
Negative Consequences ◽  
Treatment Methods ◽  
Factors Affecting ◽  
Metal Structures ◽  
Optimal Processing ◽  
Main Factors ◽  
Paint Coatings

This article is devoted to the protection of bridge metal structures from corrosion. The article was written with the aim of studying one of the stages of anti-corrosion treatment, namely the preparation of the surface before applying a protective coating. In the article, the authors address the problem of the durability of paint coatings, and point to the main reasons, to a greater extent, affecting the service life. Studying the problem of the durability of protective coatings, the authors distinguish such a stage as preparing the metal surface of the bridge structure before applying the paintwork. The authors tell how important the preparation of the surface is and what negative consequences are possible if it is disturbed or not. For a more detailed study of the problem, the authors consider several methods of preparing the surface of the structure, such as: abrasive blast cleaning, phosphating the surface and heat treatment. When studying the above mentioned methods, the authors describe the technology of the work, the main factors affecting the final result of processing, as well as the positive and negative sides of each of the methods. For each of the surface treatment methods, the authors present illustrations that clearly show the basic concept of the selected treatment option. Summing up the comparative analysis of surface treatment methods before applying anti-corrosion coatings, the authors chose the most optimal processing method, as well as concluded that the importance of this stage and the possibility of its further improvement.

scholarly journals DYNAMIC IMPACT WEAR AND IMPACT RESISTANCE OF W-B-C COATINGS

2020 ◽  
Vol 27 ◽  
pp. 37-41
Author(s):  
Josef Daniel ◽  
Jan Grossman ◽  
Vilma Buršíková ◽  
Lukáš Zábranský ◽  
Pavel Souček ◽  
...  
Keyword(s):  
Impact Test ◽  
Impact Load ◽  
Protective Coatings ◽  
Impact Resistance ◽  
Impact Testing ◽  
The Novel ◽  
Test Results ◽  
Dynamic Impact ◽  
Impact Deformation ◽  
The Impact

Coated components used in industry are often exposed to repetitive dynamic impact load. The dynamic impact test is a suitable method for the study of thin protective coatings under such conditions. Aim of this paper is to describe the method of dynamic impact testing and the novel concepts of evaluation of the impact test results, such as the impact resistance and the impact deformation rate. All of the presented results were obtained by testing two W-B-C coatings with different C/W ratio. Different impact test results are discussed with respect to the coatings microstructure, the chemical and phase composition, and the mechanical properties. It is shown that coating adhesion to the HSS substrate played a crucial role in the coatings’ impact lifetime.

Localized Epoxy Layer Formation on Surface Defect Using a Micro-Brush in a Plucking System

2009 ◽  
Author(s):  
Kun-Lin Lin ◽  
Jian-Shing Luo ◽  
Hsiu-Ting Lee ◽  
Jeremy D. Russell
Keyword(s):  
Surface Defect ◽  
Surface Damage ◽  
Sample Surface ◽  
Dark Field ◽  
Layer Formation ◽  
X Ray ◽  
Transmission Electron ◽  
Annular Dark Field ◽  
Glass Needle ◽  
Novel Method

Abstract This paper provides details of a novel method developed to cover a tiny epoxy layer as an intermediate buffer on the site-specific surface defect using a micro-bush on the tip of a glass needle in a plucking system without sample surface damage and localization problems. It describes the method and some real cases. The microstructures are investigated using an FEI Tecnai TF20 field emission gun transmission electron microscopy equipped with a high angle annular dark field detector, an energy dispersive X-ray spectroscopy, and Gatan image filter systems. The paper explains the micro-brushes and buffer layer preparation though figures and illustrations.

The effect of hydrodynamic cavitation on performance of the alkaline aluminosilicate coatings for metal structures

2018 ◽  
Vol 2 (1) ◽  
Author(s):  
Sergii GUZII 1 ◽  
Pavel KRIVENKO 1
Keyword(s):  
Protective Coatings ◽  
Optimal Parameter ◽  
Metal Substrate ◽  
Hydrodynamic Cavitation ◽  
Major Constituent ◽  
Atmospheric Conditions ◽  
Hydration Products ◽  
Metal Structures ◽  
Coated Metal ◽  
Short Period

Load-bearing metal structures working in atmospheric conditions are exposed to corrosion. Known-in-the art paint-and-lacquer protective coatings can provide protection of metal for rather short period of time (5…10 years). These structures can be effectively protected by more advanced coatings of new generation, namely: alkaline aluminosilicate binder-based coatings of barrier type. These binders differ from the known-in-the-art binding materials by formation in their hydration products of zeolite-like minerals and feldspathoids. The paper discusses principles laid down in formulating the binder composition in the (хК, уNa)2OAl2O3nSiO2mH2O system, target synthesis of hydration products of the binder matrix under influence of dynamic of the binder matrix in cavitation, optimal parameter order to synthesis of cavitation treatment aimed at nanostructuring of zeolite-like and hydromica phases after solidification. These coatings exhibit high corrosion resistance, high adhesion to metal substrate and durability results of restoration works that had been carried out in December 2010 of the Big Bell Tower of the Kiev Petchersk Lavra in order to protect corroded metal surfaces by applying the aluminosilicate binder-based coatings, the major constituent (binder) of which was represented by (0.72Na2O+0.28K2O)1.5Al2O3(4.56)SiO217.5H2O are discussed in details. In 2016, after 6 years of service in high humidity conditions and other aggressive exposures, the coated metal structures were examined and no sign of corrosion of metal substrate and damage of the applied coating was found.

scholarly journals Experimental Research on the Dynamic Response of Floating Structures with Coatings Subjected to Underwater Explosion

2014 ◽  
Vol 2014 ◽  
pp. 1-13 ◽  
Author(s):  
Feng Xiao ◽  
Yong Chen ◽  
Yu Wang ◽  
Hongxing Hua ◽  
Dawei Zhu
Keyword(s):  
Dynamic Response ◽  
Protective Coatings ◽  
Interaction Mechanism ◽  
Underwater Explosion ◽  
Test Results ◽  
Floating Structures ◽  
Structure Interaction ◽  
Initial Stage ◽  
Rubber Coating ◽  
Shock Environment

This paper presents an experimental investigation into the dynamic response of three free floating stiffened metal boxes with protective coatings subjected to underwater explosion (UNDEX). One box was kept intact while the other two were, respectively, covered with monolithic coatings and chiral honeycomb coatings. Three groups of live fire tests with different attack angles and stand-off distances were conducted. The acceleration on the stiffener and strain peak on the bottom hull were selected as the major comparative criterions. Test results show that the impulse transmitted to the structure at the initial stage can be reduced, owing to the coating flexibility and fluid-structure interaction mechanism. Consequently, the acceleration peaks induced by both shock wave and bubble pulse were reduced. The shock environment can be more effectively improved by honeycomb coating when compared with monolithic coating. Most of the strain peaks decreased to a certain extent, but some of them were notably manifested, especially for honeycomb coating. The test affirms the fact that soft coating can cause stress concentration on the shell that is in direct contact with the coating due to the impedance mismatch between the interfaces of materials. A softer rubber coating induces a greater magnitude of strain.

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