Nowadays electrochemical methods of surface treatment (including micromachining) are becoming more commonly used, which allows to find new areas of their applications. Hardening by electrochemical methods of a surface of the machine parts allows to achieve e.g. higher hardness and wear resistance. In some industrial applications electrochemical micromachining is necessary to achieve the strengthening of the coatings. The phenomenon of thermokinetic instability of the electrode-electrolyte interphase was investigated earlier [1], but practical application of the results of that study until now it was minor. The results of given research are focused on: - the macrokinetics of anodic processes at electrochemical dissolution of hardening surfaces which were obtained by electrodeposition of chromium and Co-W coatings, and electrochemical thermal treatment of steal, - the technological parameters (e.g. surface roughness and microhardness) of these surfaces after electrochemical micromachining, - the denoted interdependencies of macrokinetics and technological parameters. Thermokinetic phenomena have a negative impact on the surface final state during treatment of chromium coatings. Increasing of current density leads to increasing of cracks propagation and decreasing of the microhardness. In order to achieve a minimum surface roughness (to minimise the thermokinetic effects) during treatment of chromium coatings in nitrate solutions combination of high current density and intensive stirring should be envisage. To achieve a better technological parameters (e.g. minimum surface roughness, maximum processing speed) in the case of Co-W coatings the high current densities (greater than the anodic limiting current density) should be applied, which will ensure the transition to thermokinetic instability of the dissolution. Since, systems under investigation have the growing dependence of current efficiency on current density the localization of electrochemical dissolution is very high at given conditions. Using of high current densities ( ~ 50 A/сm2) during anodic dissolution of nitrided steel allow to obtained surfaces with minimum roughness and maximum microhardness. The current densities of such high magnitude transfer the marcokinetic of dissolution to the regime of termokinetic instability.