The production process carried out by the electroplating workshop can be divided into three links, namely, surface treatment before plating, electroplating treatment and post plating treatment. Electroplating equipment Generally, it refers to the above production equipment that directly processes parts. The electroplating process includes base color electroplating, color barrier coating, laser pattern, secondary electroplating, color barrier coating removal and protective film spraying.
Not all metal ions can be deposited from the aqueous solution. If the side reaction of hydrogen ion reduction to hydrogen on the cathode is dominant, it is difficult for metal ions to precipitate on the cathode. According to the experiment, the possibility of metal ions electrodepositing from the aqueous solution can be obtained from the periodic table of elements.
The anode is divided into soluble anode and insoluble anode, Manufacturer of electroplating wastewater treatment equipment Most anodes are soluble anodes corresponding to the coating, such as zinc anode for zinc plating, silver anode for silver plating, and tin lead alloy anode for tin plating. However, a few electroplating uses insoluble anodes due to the difficulty of anode dissolution, For example, platinum or titanium anodes are mostly used for acid gold plating. The main salt ions of the plating solution are supplemented by adding the prepared standard gold containing solution. Pure lead, lead tin alloy, lead antimony alloy and other insoluble anodes are used for chromium plating.
The precautions of electroplating process in operation are briefly introduced by taking the local black nickel plating drawing and local gold plating on zinc alloy buttons as examples.
1. Bottom color electroplating: according to the conventional black nickel wire drawing electroplating process, that is, blank - wax removal - oil removal - activation - cyanide copper plating - pyrophosphate copper plating - acid bright copper plating - bright nickel plating - black nickel plating - passivation - wire drawing. During the production of electroplating equipment, attention shall be paid to avoiding blistering, scorching, burring of the coating and controlling the thickness of the nickel layer, so as to prevent the nickel layer from being too thin and leading to wire drawing exposure.
2. Upper color barrier paint: WX-88 type special color barrier paint for two-color electroplating is selected, and the whole workpiece is covered by spray gun spraying or direct dip coating; After coating evenly, put it into the oven, bake it at 80 ℃ for 1h, and cool it naturally for use. The paint has good compactness, acid and alkali resistance, and good adhesion with the substrate coating.