The plating pen is the main tool for brush plating, which is composed of a handle and an anode. The anode is the working part of the plating pen. Graphite and platinum alloy are ideal insoluble anode materials, but graphite is the most widely used. Platinum iridium alloy is only used when the anode size is too small to use graphite. Wrap a degreasing cotton wrapper on the graphite anode, which is used to store the electroplating solution, prevent the contact between the two poles from burning the part surface and prevent the anode graphite particles from falling off and polluting the electroplating solution. The shape of the graphite anode depends on the surface shape of the plated part. Electroplating solutions include surface treatment solution, deposition metal solution and deplating solution according to different uses.
Surface treatment solution: in order to improve the bonding strength between the coating and the substrate, the plated surface must be strictly pretreated in advance, including electrocleaning treatment and activation treatment, so there are electrocleaning solution and activation solution. Electrocleaning solution: It is called electrocleaning treatment to remove the oil stain and impurities on the metal surface of parts by electrolysis. The electrocleaning solution is colorless and transparent alkaline solution. It does not freeze at - 10 ℃ and can be stored for a long time with low corrosivity. Rinse the parts with clean water after electrocleaning.
Activation solution: removing the oxide film on the metal surface of parts by electrolysis is called activation treatment, which aims to make the surface of parts show metallic luster Electroplating wastewater zero discharge manufacturer Create conditions for the combination of coating and base metal.
Deposition metal solution: brush plating solutions are generally divided into acidic and alkaline. Automatic electroplating line manufacturer The deposition rate of acid solution is 1.5~3 times faster than that of alkaline solution, but most acid solutions are not suitable for loose metal materials, such as cast iron, nor for metal materials that are not resistant to acid corrosion, such as tin, zinc, etc. Alkaline and neutral electroplating solutions have good service performance, can obtain coatings with fine grains, have good plating ability at corners, slits, blind holes, etc., and are non corrosive, suitable for plating on parts of various materials. Stripping solution: used to remove the coating on the surface that does not need to be plated, mainly removing chromium, copper, iron, cobalt, nickel, zinc and other coatings.
Abnormal thermal expansion and cold contraction Due to the existence of the expansion and contraction of the magnet, Nd-Fe-B materials are very temperature sensitive, Its linear expansion coefficient in the direction parallel to the orientation is (The linear expansion coefficient that is straight to the orientation direction, however, requires that when selecting the coating and process, the tensile stress or compressive stress between processes caused by different linear expansion coefficients between the substrate and the coating when the warm water schedule changes, so as to ensure that the coating does not appear cracking, peeling and discoloration. During the etching process of boron ash, the magnet surface will be attached with a layer of black gray powder, which is magnetic The boron rich phase separated from the bulk solution is attached to the surface of the magnet. This kind of boron ash is very difficult to wash off. It covers the surface of the material to make the coating and the substrate (the more effective method is to use ultrasonic cleaning to remove it.
