Abstract
The electrodeposition of chromium in programmed reversing current (RC), was investigated in the regime of high cathodic current density (77 A dm -2) and anodic current density (55 Adm -2). The ratio of the cathodic and anodic time (60 : 1) was used. Chromium was deposed on a steel substrate from a chromic-sulphuric acid solution, during one hour. Anode and cathode were suited in a system of parallel plates. Basic properties of deposits, like thickness, morphology, microhardness, brightness were examined. Surface distribution of the deposits was obtained from the measurements of the thicknesses of the deposits (between 32 and 67 mm).A ferromagnetic non-destructive method was used in the measurements. Based on the results, graphic models of deposit surface distribution were made. Two ranges of the thickness could be seen on the model (range 1 - average thickness 35.1 mm and range 2 - average thickness 57.81 mm). These results were statisticaly analysed by colums, rows and by the whole surface. For the whole specimens, the average thickness was 45.39 mm with a coefficient of variation of 0.2582. The basic properties of the deposits did not change with a variation of the thickness. Because of this, the coatings deposited with the reversing current could be much more considered reliable in wear and corrosion protection systems than ones deposited by direct current.
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