METHOD FOR CONTROLLING CURRENT DENSITY DURING ELECTROPLATING

摘要

The invention relates to the field of automation plating. Summary of the Invention. The bath is set auxiliary electrode is connected with the main electrode to one pole of the power source, and with the details of the suspension to the other. In a preliminary step, using different reference items volt-ampere characteristics, determined and fixed reference line equal to the current density. Determined for standard parts corresponding dependence of the current through the auxiliary electrode I.-. the bath current I, was determined by the point of intersection of each of these dependencies with the abscissa TBE extreme points of intersection I of 8EKO L83 mo ISPOLZUYUT-. jB as zone boundaries Z. lowered into the bath from the treated suspension pour (details thereof) and determining its current-voltage characteristic 11e L (l), | wherein Od, - a voltage between the workpiece and the main electrode, B; I - current van ntsA. Simultaneously determined corresponding thereto dependence of the current through the auxiliary electrode 1c. current from the bath and continue to its intersection with the axis at the point I ee I «Prior If tochZ, juice 1ad0 is within the zone in a bath set current 1, is responsible intersection point volt-ampere characteristic parts 11e - L (I) equal to a reference line 1Tde current density J (1) p gconst. If the point of intersection of 1 unit, 0 is outside the area Z, the current-voltage characteristic is shifted details Id; 1 (33) parallel to itself with respect to the axis and the amount of di,. which is determined by the formula: wherein D Kn Hades g id value bias current-voltage characteristics of the items, B} U1el deviation amount defined 10d0 from the nearest border zone Z, A; K n - proportionality factor, defined experimentally in a preliminary stage and the same for parts of any shape. After lowering the items in the bath determined approximate area parts bath was required current Determined 1Dd and compared with the value of the current I A which is obtained at the intersection of the current-voltage characteristic details L (l) to a reference line of equal density EDI s. f9 (I) p3 COns-b in this case 1d5 1ed, volt-ampere characteristic details shifted down if the current-voltage characteristic details L (l) is displaced upwards when VI I4-1 00 U SE