What is plating of Ndfeb Magnet

Plating Overview: using electrolysis of metal or other material parts of the surface layer of metal film adhesion process. Can play to prevent corrosion, improve the wear resistance, conductivity, light reflection and enhance the role of aesthetics, etc.
The concept of plating
The principle is the use of electrolytic plating in some metal on the surface of a thin layer of other metal or alloy process. Plating, coating the metal do anode, is oxidized into the electroplating solution cation; be done cathode metal plating, coating the surface of the metal cation is reduced to form the metal coating. To exclude the interference of other cations, and the coating uniformity, solid, needed a solution containing metal ions do plating plating solution in order to maintain the same coating concentration of metal ions. Purpose of plating on a substrate coated with the metal coating, changing the nature or size of the substrate surface. Electroplating can enhance the corrosion resistance of the metal (the metal coating of corrosion-resistant metal Duo), increased hardness, to prevent wear and improve the electrical conductivity, lubrication, heat resistance, and surface appearance.
Plating role
Mechanical products using electrolysis to deposit a good adhesion, but the performance and different metal matrix material coating technology. Hot dip plating layer evenly than is generally thinner, from a few microns to tens of microns. By electroplating, mechanical products can be obtained on the protective and decorative features of the surface layer can also repair worn parts and processing errors. Most of the single layer of metal or alloy, such as titanium target, zinc, cadmium, gold or brass, bronze, etc.; also diffusion layer, such as nickel - silicon carbide, nickel - graphite fluoride, etc.; there are laminated layers, such as steel copper - nickel - chrome, steel silver - indium layer. Electroplating of iron-based matrix material cast iron, steel and stainless steel, there are non-ferrous metals such as ABS plastic, polypropylene, polysulfone, and phenolics, but the plastic before plating, must go through the activation and sensitization of special treatment.
Plating Principle
Filled with the plating solution in the plating bath, after pretreatment to be clear and specific as the cathode plating, metal plating anodes with bipolar DC power supply respectively the positive and negative connections. Plating by the plating solution containing metal compounds, conductive salts, buffers, pH adjusting agent and additives in aqueous composition. Power, the electroplating solution of metal ions, the role of the potential difference is moved to form a coating on the cathode. Anode metal to form metal ions into the plating solution to be coated in order to maintain the concentration of metal ions [1]. In some cases, such as chromium, is the use of lead, lead-antimony alloy insoluble anode, it is only from the transmission of electronic, conducting current role. Chromium electrolyte concentration, the need to rely on a regular basis adding to the bath to maintain the chromium compounds. Plating, the anode material quality, plating solution composition, temperature, current density, power-on time, stirring intensity, precipitation of impurities, such as the power waveform will affect the quality of coating, the need for timely control.
Plating method
Into rack plating, barrel plating, continuous plating and brush, etc., mainly in connection with the plating on the size and bulk. Rack size for general products, such as car bumpers, bicycle handlebars and so on. Barrel plating for small parts, such as fasteners, washers, pins and so on. Continuous plating for mass production of wire and strip. Brush plating or for local repair. Plating solutions are acidic, alkaline and processing a mixture of chromium acid and neutral solutions, no matter what kind of coating methods, coating products and bath and be in contact plating tank, and so should be hanging with a certain degree of versatility.
Coatings Classification
Protective coating layer is divided into decorative and functional coating categories.
Decorative protective coatings mainly in the ferrous metals, non ferrous metal and plastic on the chrome layer, especially steel, copper - nickel - chromium, zinc and nickel on steel - chromium layer. In order to save nickel, it has been able to steel copper - nickel / iron - sulfur Ni - nickel / iron - low solid points of nickel - chromium layer. Similar to the chrome layer with tin / nickel plating can be used for analytical balance, chemical pumps, valves and flow measurement meter.
Functional coatings that many different types of coatings, such as: ① to improve the compatibility with the journal and bearing embedded in the cover layer, lead - tin and lead - copper - tin and lead - indium and other composite coating; ② for resistance grinding, the high-speed diesel engine piston rings on the hard chrome plating, this coating can also be used in the plastic mold with non-stick molds and long life characteristics; ③ herringbone gear in a large sliding surface of copper, to prevent Early nap sliding surface; ④ steel matrix being used to prevent atmospheric corrosion of zinc; ⑤ prevent the copper tin plating Nitriding; ⑥ for radio, television manufacturers in the brazing of steel and aluminum to prevent galvanic corrosion between the tin - zinc coating. For repair and manufacturing engineering coating, chromium, silver, copper, and their thickness was relatively large, hard chromium layer thickness of 300 microns.
Basically follows the process of electroplating
A coating of metal connected to the anode
2 connected to the cathode plating
3 cathode and anode to plated metal ion composition of the electrolyte solution is connected
4 through the DC power supply, the anode metal will conduct oxidation (lose electrons), the positive ions in solution is reduced at the cathode (the electron) into the surface atoms and accumulate in the negative.
Beautiful objects after plating and electroplating current size of relations, the current smaller objects will be more beautiful plating; otherwise it will be some uneven shape.
The main purpose of including the prevention of plating metal oxide (eg rust) as well as decoration. The outer layer is also a lot of coin plating.
Electroplating wastewater generated (such as the loss of effectiveness of the electrolyte) is an important source of water pollution.