Corrective Maintenance and Hardening of Agricultural Machinery Parts

摘要

The article presents information on the technological characteristics and industrial use of chroming electrolytes. The modern electrochemical technologies of repairing worn-out parts of agricultural machinery are considered. Particular attention is paid to the use of chrome plating methods making possible to increase the durability and reliability of the parts recovered in electrolytes of different composition, allowing to obtain coatings with high physical-mechanical properties that determine their suitability for the operation in the process of use for their intended purpose. The use of self-regulating dilute chroming electrolytes makes possible to increase the productivity of the deposition process of chromium coatings significantly, to obtain high-quality coatings of chromium and iron, and high adhesion to the base material - carbon, alloyed steels, and cast iron. The deposition of metals using reverse, pulsed currents with adjustable anodic-cathodic ratio of amplitude values and its duration allows to influence electro crystallization, control the structure, texture and roughness of the formed precipitate, which makes possible to get with predetermined functional physical and mechanical properties for specific repair conditions and subsequent operation in agricultural machinery. The following modes are recommended for brilliant coatings: when reverse current τ(cat) / τ(an) = 50-70, x(cat) = 4-7 min, D(cat) = 40-100 A / dm~2, D(cat) / D(an) = 3-4, T = 60-65 ° C; when impulse current D(cat) = 40-100 A / dm~2, T = 60-65 ° C, τ(imp) = 1.5-2.5 min, τ(pauses) = 5-10 sec, impulse ratio 1.07-1.15.