As the title implies the influence of the electrolysis on the nature and magnitude of residual stresses in the steel base and the chrome coating during restoration of parts has been considered. It has been shown that with an increase in compressive stresses on the surface, a decrease in tensile stresses in the chromium deposit and transition of tensile stresses to compressive ones near the boundary of the base are observed. A correlation between the parameters of the crystal lattice of electroplated chromium and the steel base has been established. The values of the tensile residual stresses in the chromium deposit decrease with increasing the compressive residual stresses in the base.
The article considered electrodeposited coatings made of iron- and nickel-based alloys doped with molybdenum. The studies carried out by optical and electron microscopy, X-ray structural analysis, as well as the determination of hardness and corrosion rate of the coatings under study allowed us to determine the laws of the influence of the structure on the properties of electrodeposited alloys immediately after obtaining, as well as after thermal treatment. Corrosion tests carried out both in the media of produced water of oil fields of Western and Eastern Siberia and in standard media allowed to determine the conditions for obtaining and thermal treatment of coatings, in which the effectiveness of protection with coatings is at maximum. Due to comparison with standard media, the influence of not only the pH of the medium but also the degree of its mineralization has been established. This article may be of interest to researchers studying the structure and properties of electrodeposited coatings, as well as to specialists in the field of corrosion protection and technologists of galvanic production.
The article is devoted to the results of studies, which have been conducted on parts with electrolytic chromium in order to determine the effect of the coating on fatigue strength of their. The work was performed in observance of standards, which are fixed in GOST RV 2840-001-2008. Samples for the tests were made from standard gas turbine engine compressor blades. We used a VEDS- 1500 electrodynamic vibration stand with an UMK-12K power amplifier to excite vibrations. It has been shown that the minimum endurance limit of 46 kgf/mm2 based on 2 ∙ 107 cycles, established on uncoated parts, didn't decrease during fatigue tests of compressor blades with an electroplated chrome layer. It should be stressed that the influence of the geometry of the chrome-plated part on the reduction of the endurance limit has been established.
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