Process for producing the depot direct or indirect harmful effects with a layer of hard chromium, like certain enzymes in the corrosion.

摘要

According to this process, in order to deposit a layer of hard chromium, is carried out with a pulse-wise direct current having a frequency of pulses between a critical value, lower and a value of the critical frequency greater than (f0) determined, the critical frequency greater than (f0) being determined for a current efficiency is optimized, and this so that for frequencies increases until it reaches this frequency (f0), it passes from a deposit a brilliant without cracks to deposit a glossy with increasingly of cracks and, in the zone between the critical frequency of less than and greater than this critical frequency is chosen, the duration of application of the direct current pulses in order to obtain a shiny deposit practically no cracks. & br / application, in particular, the deposition of a layer of hard chromium on the machined parts made of steel.