We all know that electroplating technology is widely used in modern times. Electroplating can increase the hardness, prevent abrasion, improve the electrical conductivity, lubricity, heat resistance, and surface beauty of products. Many buttons (including metal buttons, plastic buttons, etc.), belt buckles and some accessories, etc. need electroplating processing。
Electroplating electroplating (English) is the use of electrolytic principle in some metal on the surface of a thin layer of other metal or alloy plating process, is the use of electrolytic action made of metal or other material adhered on the surface of the parts of a layer of metal film process to prevent corrosion, improve the wear resistance and electric conductivity, reflective and enhance the action such as beautiful, such as hardware buttons plating。
Principle of electroplating: in the plating bath, the cleaned and specially pretreated parts to be plated are used as the cathode, and the anode is made of the plated metal. The poles are connected with the negative and positive poles of the dc power supply respectively. Electroplating solution consists of an aqueous solution containing metal-coated compounds, conductive salts, buffer, ph regulator and additives. After electrification, metal ions in the electroplating bath, under the action of potential difference, move to the cathode to form a coating. The metal of the anode forms metal ions into the plating solution to maintain the concentration of the metal ions being coated. In some cases, such as chromium plating, is an insoluble anode made of lead or lead-antimony alloy, which ACTS only as a carrier of electrons and conducting a current. The concentration of chromium ions in the electrolyte is maintained by periodically adding chromium compounds to the bath. During electroplating, the quality of anode material, composition of electroplating solution, temperature, current density, electrification time, stirring intensity, precipitation of impurities, power waveform, etc., will affect the quality of the coating, which needs to be timely controlled。
Buttons electroplating classification: buttons electroplating can be divided into hanging plating, rolling plating, continuous plating and brush plating, mainly with the size of the parts to be plated, batch and requirements。
Electroplating power went through four stages of development
(1) in the stage of dc generator, this power source has been eliminated due to its high energy consumption, low efficiency and high noise.
(2) silicon rectifier stage is a replacement product of dc generator, with mature technology, but low efficiency, large volume and inconvenient control. At present, many enterprises still use this kind of electroplating power supply。
(3) the SCR rectifier stage is the mainstream power supply that replaces the silicon rectifier power supply at present, with the characteristics of high efficiency, small volume and convenient regulation. With the development and maturity of SCR technology, the power supply technology has been widely used.
(4) the transistor switching power supply, namely pulse power supply 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 supply has the characteristics of small size, high efficiency, superior performance, stable ripple coefficient and not easy to be affected by the output current. Pulse electroplating power supply is the direction of development, has begun to use in the enterprise.
The basic process of button plating is as follows
Connect the coated metal to the anode
Connect the plating to the cathode
The anode and cathode are connected by an electrolyte solution consisting of positive ions of the plated metal
With a dc source, the metal in the anode oxidizes (loses electrons), and the positive ions in the solution are reduced (gains electrons) at the cathode to form atoms and accumulate on the surface of the negative electrode.
After electroplating, the beauty of the electroplated object is related to the size of the current. The smaller the current, the more beautiful the electroplated object will be. Otherwise, there will be some uneven shape.