There are various methods and practical examples to determine and to evaluate the production quality level. They include measuring, sensory, calculation, data-recording, sociological and expert methods. Among the variety of general-purpose statistical methods, only seven of them are chosen, which are applied by different specialists. They allow timely detecting and showing the problems, revealing the main points to start with, and helping to distribute the efforts to effectively fulfill main tasks.

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The results of studying the structure of the coating obtained by «freezing-out» method with a preliminary surface preparation including application of the underlayer or precoat by cladding with a flexible tool (CFT) are presented. The CFT procedure consists in coating with a rotating cylindrical metal brush. The developed technology of coating using «freezing-out» with the preliminary application of the precoat makes it possible to exclude harmful and labor-consuming galvanic operations. The effect of technological parameters on the quality of CFT-formed coating, i.e., the structure of the interface between the steel-copper system and data of durometric measurements of the microhardness of the copper layer and the steel core were analyzed. Elastic-stress states in the surface layer of the core and in the copper coating were determined using X-ray tensometry by the method of oblique survey. The effect of the underlayer of various materials (copper, brass, tin, tin-lead alloy) on the adhesion of the main copper coating to the core after «freezing-out» copper was studied using an adhesimeter. A fractographic analysis of the destroyed coating surfaces was also carried out. The distribution of metals in the border zones of the steel-copper compound is determined. Camscan scanning electron microscope and X-ray microanalyzer Link exL are used to examine the zone structure for the presence of intermetallic compounds. The developed «freezing-out» procedure with a preliminary application of the undercoat by CFT method is environmentally friendly, easy to use and low-power-consuming technology.

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