We all know that today's electroplating technology is very widely used in modern applications. Electroplating can increase hardness, prevent abrasion, improve electrical conductivity, lubricity, heat resistance, and aesthetic appearance. Many buttons (including metal buttons, plastic buttons, etc.), belt buckles and some jewelry, etc. need to be electroplated processing, Xiao Bian here to share with you summary of metal button plating technology knowledge.
Plating (English electroplating) is the use of electrolysis principle to plate a thin layer of other metals or alloys on the surface of certain metals. It is the use of electrolysis to attach metal films to the surface of metal or other materials. Prevent corrosion, improve wear resistance, conductivity, reflective properties, and enhance aesthetics, such as hardware button plating.
Principle of electroplating: In the plating bath containing plating solution, the cleaned and specially pre-treated pieces to be plated are used as cathodes, and the anodes are made of plated metal, and the two poles are respectively connected to the negative and positive electrodes of the DC power source. The plating solution consists of an aqueous solution containing a metal-coated compound, a conductive salt, a buffer, a ph regulator, additives, and the like. After the power is applied, the metal ions in the plating solution move to the cathode by a potential difference to form a plating layer. The metal of the anode forms metal ions into the plating solution to maintain the concentration of the metal ions being plated. In some cases, such as chrome plating, insoluble anodes made of lead and lead-antimony alloys are used, which only serve to transmit electrons and conduct current. The chromium ion concentration in the electrolyte needs to be maintained by periodically adding a chromium compound to the bath. When electroplating, the quality of the anode material, the composition of the plating solution, the temperature, the current density, the electrification time, the stirring intensity, the precipitated impurities, the power waveform, etc. all affect the quality of the plating and need to be controlled in a timely manner.
Button electroplating classification: Button electroplating can be divided into rack plating, barrel plating, continuous plating and brush plating and other methods, mainly related to the size, batch size and requirements of the parts to be plated.
The electroplating power supply has undergone four development stages. (1) DC generator stage This type of power source consumes large amounts of energy, is inefficient, and is noisy. It has been eliminated.
(2) The silicon rectifier stage is a new generation of DC generators. The technology is very mature, but it is inefficient, bulky, and inconvenient to control. At present, many companies still use this kind of electroplating power supply.
(3) The thyristor rectification stage is currently the mainstream power source that replaces the silicon rectification power supply, and it is characterized by high efficiency, small size, and easy control. With the maturation and development of the core device - thyristor technology, the power supply technology has matured and it has been widely used.
(4) Transistor switching power supply is the pulse power phase pulse electroplating power supply is the most advanced electroplating power supply. Its appearance is a revolution of electroplating power supply. This kind of power source has the characteristics of small size, high efficiency, superior performance, stable ripple coefficient, and is not easily affected by the output current. Pulsed electroplating power is the direction of development and is now beginning to be used in enterprises.
The process of button plating is basically as follows: 1 plating metal is connected to the anode 2; plating is connected to the cathode 3; anode is connected to the electrolyte solution composed of positive ions of the plated metal; 4) after the DC power is applied, the metal of the anode is oxidized In the reaction (losing electrons), the positive ions in the solution are reduced (electrons obtained) into atoms at the cathode and accumulate on the surface of the negative electrode.
After electroplating, the aesthetic appearance of the electroplated object is related to the size of the current. The smaller the current, the more attractive the electroplated object will be. On the contrary, some uneven shapes will appear.
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