How is the electroplating master tempered?

One: The higher the temperature, the cleaner the pretreatment oil removal. However, it is necessary to prevent the oil removing parts from being exposed from the liquid surface due to evaporation of the oil removing liquid. It is difficult to remove the alkali film on the exposed parts of these quick-drying covers, which easily leads to foaming and peeling of the coating.

Two: Iron and copper cannot be degreased in the same degreasing tank, nor can they be pickled, activated or neutralized in the same tank. This is because iron materials and copper ions will be replaced, and copper ions will be adsorbed on the surface of iron materials, which will lead to peeling due to poor bonding force during electroplating. If it has happened, the copper replacement layer must be removed in the stripping solution prepared by sodium cyanide and anti-dye salt before electroplating. Similarly, the copper pickling solution will accumulate copper ions after a certain period of use. When the copper ion exceeds a certain concentration, it will crystallize and precipitate on the surface of the workpiece, resulting in pitting corrosion after electroplating. Therefore, the copper pickling solution should be replaced regularly.

Three: For electroplating parts of non-ferrous metals such as copper and zinc, we generally use alkaline solution without sodium hydroxide to remove oil (reduction reaction has high oil removal efficiency and does not corrode parts, but the disadvantage is that steel parts are prone to hydrogen embrittlement and ash hanging). For high-strength steel, thin steel plate and spring parts, in order to avoid "hydrogen embrittlement", only anodic degreasing is generally carried out (oxidation reaction is inefficient and corrosive to non-ferrous metals, and a layer can be peeled off on the surface of the material). For electrolytic degreasing of general steel materials, we adopt the method of cathodic degreasing first and then anodic degreasing for a short time, which can not only remove impurities on the surface of the workpiece, but also remove hydrogen.

Four: The most practical way to check whether degreasing is clean is to wash it with acid after degreasing, then wash it with water, and then check whether the water film on the surface of the plated part is evenly wet. If there are water drops on the surface of the plated part, it means that it is not clean, and it is necessary to continue degreasing and degreasing.

Five: When measuring the PH range of the solution with PH test paper, immerse the test paper in the solution to be measured for 0.5 seconds, and watch and compare it quickly after taking it out.

Calculation formula of actual consumption of intransitive verb additive-(actual current A÷ 1000A)× (electroplating time m÷60m)× Kilampere hour consumption.