Continuous electrolytic method in neutral solution for pickling and descaling carbon steels and stainless steels involves selecting anodic treatment times and cell currents according to specific formula

摘要

A continuous electrolytic method in a neutral solution comprises selecting anodic treatment times and cell currents such that the product of current density crossing the cell and anodic treatment time is the sum of a constant fraction of electric charge density outputted for the direct oxide changing anodic reactions and the product of a time constant and the current density. A continuous electrolytic method in a neutral solution for pickling and descaling of carbon steels and stainless steels involves the presence of electrolysis current flow indirect effects. The current is direct current (DC) or alternating current (AC) having a frequency lower than 3 Hz. The anodic treatment times and the cell currents are selected according to formula It = c + kI where I is the current density crossing the cell; t is the anodic treatment time; c is the constant fraction of electric charge density outputted for the direct oxide changing anodic reactions; and k is a time constant for the calculation of the fraction of electric charge density, proportional to the current density, outputted for the indirect anodic reactions linked to oxygen development and to the consequent acidification at the steel/electrolytic solution interface for the carbon steels and at the scale/solution interface for the stainless steels.