INVESTIGATION OF THE OPERATING PROPERTIES OF COATINGS FOR HEAVILY LOADED STEEL PARTS OF SLIP FRICTION

Metal products are subjected to atmospheric corrosion during transportation and storing. An important way to prevent this negative phenomenon is application of special packing materials, in particular materials, containing volatile inhibitors of corrosion, which protect metal against various corrosion agents. To protect metal effectively it is necessary to provide a definite level of operating characteristics of packing materials. The purpose of the work was the study of operating properties of inhibited crepe, inhibited and laminated polyethylene film, inhibited crepe and reinforced by polypropylene web papers, manufactured by OJSC “PP TechnoKhim”, Magnitogorsk, used for packing of metals. Structural and dimensional, sorption, deformation and strength characteristics, of the studied anticorrosion papers are presented, the characteristics being calculated based on the results of measurements. To determine their physical-mechanical and anticorrosion properties, standard methods and methodologies were used. To evaluate impact of moisture and transportation conditions, indices of water adsorption and wear of the studied papers were determined. Inhibitor content in these materials was determined by thermogravimetric analysis method. Their protective ability was studied on samples of low carbon steel strip. For accelerated corrosion tests the strip samples were degreased by alcohol, dried in air and packed in the studied anticorrosion papers, after that they were exposed under increased temperatures and moisture conditions. It was determined, that among the materials under the study, the inhibited crepe paper, reinforced by polypropylene web, hhas the best complex of physical-mechanical and anticorrosion properties. It provides a higher level of prevention corrosion of metal l and surpasses other materials in a number of deformation and strength characteristics. Recommendations were proposed to improve qquality of produced anticorrosion papers.

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Evaluation of the accuracy indicators in determination of the coating thickness by crater grinding method

Industrial laboratory Diagnostics of materials ◽

10.26896/1028-6861-2020-86-7-39-44 ◽

2020 ◽

Vol 86 (7) ◽

pp. 39-44

Author(s):

K. V. Gogolinsky ◽

A. E. Ivkin ◽

V. V. Alekhnovich ◽

A. Yu. Vasiliev ◽

A. E. Tyurnina ◽

...

Keyword(s):

Coating Thickness ◽

Functional Dependence ◽

Measurement Procedure ◽

Metrological Certification ◽

Measuring Instruments ◽

Properties Of Coatings ◽

Special Equipment ◽

Grinding Method ◽

Accuracy Of Measurements ◽

Wide Range

Thickness is one of the key indicators characterizing the quality and functional properties of coatings. Various indirect methods (electromagnetic, radiation, optical) most often used in practice to measure thickness are based on the functional dependence of a particular physical parameter of the system «base – coating» on the coating thickness. The sensitivity of these procedures to the certain properties of coatings imposes the main restriction to the accuracy of measurements. Therefore, the development and implementation of the approaches based on direct measurements of geometric parameters of the coating appears expedient. These methods often belong to the class of «destructive» and, in addition to measuring instruments, require the use of special equipment. To ensure the uniformity of measurements in the laboratory or technological control, these methods are isolated as a separate procedure (method) and must undergo metrological certification in accordance with GOST R 8.563–2009. We present implementation, metrological certification and practical application of the method for measuring thickness of coatings by crater-grinding method. The principles of technical implementation of test equipment, measurement procedure and calculation formulas are described. The results of evaluating the accuracy indicators of the proposed procedure by calculation and experimental methods are presented. In both cases, the relative error did not exceed 6%. The applicability of the developed technique is shown for a wide range of coating materials (from soft metals to superhard ceramics) of different thickness (with from units to hundreds of micrometers). Apart from the goals of process control and outgoing inspection, the method can be recommended as a reference measurement procedure for calibration of measures and adjusting samples for various types of thickness gauges.

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Wear and microstructural properties of coatings on Weldox 700 steel

Materials Testing ◽

10.3139/120.111526 ◽

2020 ◽

Vol 62 (6) ◽

pp. 645-651 ◽

Cited By ~ 2

Author(s):

Cihan Özorak ◽

Faik Okay ◽

Ebru Özorak ◽

Serkan Islak

Keyword(s):

Microstructural Properties ◽

Properties Of Coatings

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RESTORATION OF MACHINE PARTS WITH GALVANIZED ZINC COATINGS

Tekhnicheskiy servis mashin ◽

10.22314/2618-8287-2020-58-4-140-147 ◽

2020 ◽

Vol 4 (141) ◽

pp. 140-147

Author(s):

MIKHAIL VIKHAREV ◽

◽

VLADIMIR YUDIN ◽

VESELOVSKIY NIKOLAY ◽

◽

...

Keyword(s):

Current Density ◽

Cathode Surface ◽

Zinc Coating ◽

Cathode Current Density ◽

Research Purpose ◽

Cathode Layer ◽

Properties Of Coatings ◽

Chemical Polarization ◽

Cathode Current ◽

Zinc Coatings

The article shows the role of electroplating in the restoration of parts, indicates the advantages of restoring parts with electroplating over other methods, and gives the characteristics and properties of coatings obtained by electroplating. (Research purpose) The research purpose is in increasing the speed of application of zinc electroplating when restoring parts. (Materials and methods) The cathode current density has a decisive influence on the coating speed. The main reason for limiting the cathode current density during galvanizing from sulfuric acid electrolytes is the chemical polarization of the cathode. The article presents a study on the designed installation for the application of galvanic coatings. When applying coatings to the internal surfaces of parts, there was used a device with activating elements having an electromechanical rotation drive. This device prevents depletion of the near-cathode layer of the electrolyte and reduces the chemical polarization of the cathode. Elements made of moisture-resistant skin were used as activators. (Results and discussion) The article presents the results of experiments as a dependence of the coating speed on the speed of the activator relative to the restoring surface. It also presents the relationship between the size of the abrasive grains of the activating elements, the force of their pressing against the cathode surface, the speed of movement of the activator and the speed of applying the zinc coating, as well as its quality. By activating the cathode surface, it was possible to raise the operating current density to 100-150 amperes per square decimeter. The speed of application of zinc coatings is 16-25 micrometers per minute. (Conclusions) In the course of research, authors determined the conditions of electrolysis during galvanizing, which provide a significant increase in the cathode current density and the rate of application of these coatings during the restoration of parts.

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Investigating formation, structure and properties of coatings based on Cu–Ti alloys

Voprosy Materialovedeniya ◽

10.22349/1994-6716-2018-93-1-175-181 ◽

2019 ◽

pp. 175-181

Author(s):

A. I. Kovtunov ◽

T. V. Semistenova ◽

A. M. Ostryanko

Keyword(s):

Wear Resistance ◽

Heat Resistance ◽

Chemical Compound ◽

Wear Resistant Coating ◽

Titanium Coating ◽

Structure And Properties ◽

Properties Of Coatings ◽

Wear Resistant ◽

Ti Alloys ◽

Titanium Wire

The paper offers technology of argon-arc surfacing with titanium wire in order to form heat and wear resistant coating based on the titanium cuprides. The influence of surfacing modes on the chemical compound and structure of formed coatings is determined. The wear resistance and heat resistance at 600°C and 800°C were researched for copper–titanium coating with 8–63% titanium.

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Operating properties of superconducting fault current limiters based on YBCO thin films

Cryogenics ◽

10.1016/s0011-2275(01)00064-9 ◽

2001 ◽

Vol 41 (3) ◽

pp. 163-167 ◽

Cited By ~ 22

Author(s):

Hyo-Sang Choi ◽

Hye-Rim Kim ◽

Ok-Bae Hyun

Keyword(s):

Thin Films ◽

Fault Current ◽

Operating Properties ◽

Ybco Thin Films ◽

Fault Current Limiters

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Transport Properties of Coatings Consisting of Al2O3 Nanoparticles

Journal of Engineering Physics and Thermophysics ◽

10.1007/s10891-021-02270-4 ◽

2021 ◽

Vol 94 (1) ◽

pp. 30-35

Author(s):

Yu. A. Kuzma-Kichta ◽

N. S. Ivanov ◽

A. V. Lavrikov

Keyword(s):

Transport Properties ◽

Al2o3 Nanoparticles ◽

Properties Of Coatings

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Improving the microstructure and mechanical properties of laser cladded Ni-based alloy coatings by changing their composition: A review

REVIEWS ON ADVANCED MATERIALS SCIENCE ◽

10.1515/rams-2020-0027 ◽

2020 ◽

Vol 59 (1) ◽

pp. 340-351

Author(s):

Lin Yinghua ◽

Ping Xuelong ◽

Kuang Jiacai ◽

Deng Yingjun

Keyword(s):

Mechanical Properties ◽

Wear Resistance ◽

Corrosion Resistance ◽

Rare Earth ◽

Composite Coatings ◽

Single Element ◽

Properties Of Coatings ◽

Hard Particles ◽

Microstructure And Mechanical Properties ◽

Nickel Based Alloy

AbstractNi-based alloy coatings prepared by laser cladding has high bonding strength, excellent wear resistance and corrosion resistance. The mechanical properties of coatings can be further improved by changing the composition of alloy powders. This paper reviewed the improved microstructure and mechanical properties of Ni-based composite coatings by hard particles, single element and rare earth elements. The problems that need to be solved for the particle-reinforced nickel-based alloy coatings are pointed out. The prospects of the research are also discussed.

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