Wear resistence of complex electrolitic coatings in electrolite environments

Yu.M Bilyk,B.I Kupets,A.V Martyniuk,N.K Medvedchuk

doi:10.31891/2079-1372-2019-94-4-13-20

Abstract

The technology of formation of wear-resistant composite electrolytic coatings (CEP) based on nickel-based is presented. CEP. These coatings contained a filler consisting of powders of silicon carbide of various fractions and amorphous boron with a particle size of about 1 μm for further heat treatment. The obtained coatings were tested for their cavitation and erosion resistance in electrolyte media

Highlights

In the general problem of increasing the reliability and durability of the machinery and equipment of the light, chemical and food industries, it is important to increase the reliability and durability of the parts subject to cavitation-erosion wear in corrosive environments
The purpose of this work is to study and systematize the cavitation-erosion characteristics of CEP in electrolyte media, the features of their structure formation, the effect of heat treatment on the wear resistance of coatings and the possibilities of purposeful change of the coating characteristics depending on the conditions of external microwave loading, corrosion activity of the environment
The obtained coatings according to the chemical analysis contained from 0.5 to 6.0 wt.% Boron and from 10 to 44.2 wt.% Eutectic alloy, and after annealing in the temperature range from 200 to 1050 for 0.5 to 5 h had a structure uniformly distributed in the metal matrix from a solid boron solution of inclusions of the corresponding borides Ni3B, Co2B, Fe2B and inclusions of the eutectic alloy

Summary

Introduction

In the general problem of increasing the reliability and durability of the machinery and equipment of the light, chemical and food industries, it is important to increase the reliability and durability of the parts subject to cavitation-erosion wear in corrosive environments. The analysis of nickel-based CEP [2, 7 - 12] shows the wide technological possibilities of changing their composition and properties, but they have lower durability compared to chrome coatings, low adhesion to the substrate, porosity These disadvantages are sought to be eliminated by heat treatment of coatings in order to improve their physical and mechanical characteristics, wear resistance, corrosion resistance, etc. Thermal treatment of CEP is performed by laser, high-frequency currents that provide high rates of heating and cooling, locality and discretion of processing [10, 16], but these methods are expensive and not well-researched The use of these coatings to increase cavitation and erosion resistance in aggressive environments is very limited due to the lack of studied mechanisms of their formation, physical, mechanical and operational characteristics, and especially because there are no clearly stated requirements for cavitation and wear resistant CEP, ways to implement these CEP requirements. The urgent task is to research and systematize the cavitation-erosion, corrosion and electrochemical characteristics of the CEP, the features of the formation of their structure, the effect of heat treatment on the wear resistance of the coatings and the possibilities of purposeful change of the characteristics of the coating, depending on the conditions of external microwave loading, corrosion activity of the environment

Aims and objectives of research

Main results and conclusions

Literature

20. Эрозия