The quality of the decorative chrome layer is closely related to the binding method. The following points should be paid attention to.
(1) The copper wire used should be appropriate. It is better to choose the diameter of the copper wire to be slightly thinner, so as to prevent the surface of the binding place from being covered and hinder the normal deposition of chromium. If necessary, it can be bound at different parts separately to solve the resistance caused by the thin cross section of the copper wire. Too big a problem.
(2) The binding should be properly tightened. If the binding is too tight, the surface will be covered, which will affect the deposition of chromium; if the binding is too loose, it will cause poor contact. .
(3) The binding position should be selected appropriately. When choosing the binding position, it is first necessary to consider whether there will be binding marks at the binding place, whether there will be air in the blind hole, and whether the protruding part of the tip will cause the coating to burn due to improper orientation. For this reason, it is necessary to choose to bind the non-decorative part of the plated part and the part with a small diameter, and make the gas in the blind hole easy to discharge, and keep the tip and convex part away from the anode.
(4) The copper wire used for binding must be processed in advance. The copper wire used for binding chrome-plated parts must be pickled in advance and plated with a thin layer of nickel or chromium, otherwise it is difficult to sink the chrome layer on the surface of the plated parts at the binding place.
(5) The appearance of the plating parts in the same string should be basically similar. The difficulty of chromium deposition on different shapes of plated parts is different, so there are differences in distribution current, control of plating time, etc. Some of the parts may have been burnt, but some have not been completely covered with chromium due to the low current.
(6) It is necessary to master the length of each string of plating pieces. The length of a series of plated pieces should be equal to the length of the anode plate below the liquid surface. After the plated pieces are hung in the plating tank, the upper part is 5cm lower than the liquid surface, and the lower part is 5cm lower than the lower edge of the anode plate. It can ensure that the chrome layer can be well deposited on the upper plated part, and the lower plated part will not be burnt. When it is impossible to bind to the above-mentioned length due to insufficient number of plated parts, a piece of copper wire can be left at the tail or a waste part can be tied to draw away part of the current, thereby avoiding the possibility of the tail plated parts being scorched.
(7) It is not advisable to use old copper wires for binding. The surface of the old copper wire is rough and not straight. It is very easy to produce binding marks when binding the plated parts with this kind of copper wire. If necessary, the original coating can be removed first and then annealed. Kind is possible.
(8) Pay attention to the spacing between each plated piece. The distance between the plated part and the plated part shall not be smaller than the cross section of the plated part itself. If the distance between the two is too small, it will be difficult to sink the chrome layer on the center of the cross section, and if the distance is too large, it will
affect the production schedule.
(9) Anti-shaking measures should be taken when binding small and light pieces. Light and small pieces are easily impacted by the current and flutter with the waves during chrome plating, which affects the normal passage of current between the copper wire and the plated piece, and the current is intermittent, which seriously affects the quality of the coating. The solution is to bind a non-electroplated part at the tail before binding, which can be metal or non-metallic. Porcelain materials such as insulators can be hung under the plated part as aconite, so that chrome-plated parts can be avoided. Shake with the waves, thus ensuring the quality of chrome-plated parts.
