Technical Knowledge Of Metal Button Plating

We all know today.

In modern applications, electroplating can increase hardness, prevent abrasion, improve electrical conductivity, lubricity, heat resistance and surface beauty.

Many buttons (including metal buttons, plastic buttons, etc.).

And some accessories need plating process, Xiaobian shares with you the knowledge of metal button plating technology.

Electroplating (Electroplating) is the process of plating a thin layer of other metals or alloys on some metal surfaces by electrolysis. It is the process of using electrolysis to make the surface of metal or other material pieces adhere to a metal film, thereby preventing corrosion, increasing wear resistance, conductivity, reflecting light and improving the appearance.

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Electroplating principle: in the plating tank containing electroplating bath, the parts to be plated after cleaning and special pretreatment are used as cathodes, and the anode is coated with metal. The poles are connected to the negative and positive electrodes of the DC power supply respectively.

The plating solution consists of an aqueous solution containing a metal plated compound, a conductive salt, a buffer, an pH regulator, and an additive.

After electrifying, the metal ions in the electroplating solution are moved to the cathode to form a coating under the action of potential difference.

The anode metal forms metal ions into the electroplating solution to maintain the concentration of the coated metal ions.

In some cases, such as chromium plating, it is an insoluble anode made of lead and lead antimony alloy, which only pfers electrons and leads current.

The concentration of chromium ions in the electrolyte depends on the addition of chromium compounds to the bath regularly.

The quality of the anode, the composition of the plating solution, the temperature, the current density, the power on time, the stirring strength, the impurity and the power waveform will affect the quality of the coating.

Button plating classification: button plating can be divided into hanging plating, barrel plating, continuous plating and brush plating, etc., mainly related to the size, volume and requirements of the parts to be plated.

Four stages of development of electroplating power

(1) at the stage of DC generator, this kind of power supply has been eliminated due to its high energy consumption, low efficiency and noise.

(2) silicon rectification stage is a replacement product of DC generator. Its technology is very mature, but its efficiency is low, its volume is large, and its control is inconvenient.

At present, many enterprises still use this kind of electroplating power supply.

(3) SCR rectification stage is the main power source to replace silicon rectifier power supply at present. It has many advantages, such as high efficiency, small volume, convenient control and so on.

With the maturity and development of the core device - SCR technology, the power technology is becoming more and more mature and has been widely applied.

(4) pistor switching power supply, namely pulse power supply, is the most advanced electroplating power source. It is a revolution in electroplating power supply.

The power supply has the characteristics of small size, high efficiency, superior performance, stable ripple coefficient, and is not easily affected by output current.

Pulse plating power is the development direction, and now it has been used in enterprises.

The process of button plating is basically as follows.

1 connect the plating metal to the anode.

2 plating parts on the cathode.

3 the anode and cathode are connected by electrolytes consisting of positive ions of the plated metal.

After the 4 power is supplied by direct current, the anode will oxidize (lose electrons). The positive ions in the solution are recharged at the cathode (electrons) into atoms and accumulate on the surface of the negative electrode.

After plating, the beauty of the plated objects is related to the size of the current. The smaller the current, the more beautiful the objects will be plated; otherwise, there will be some unsmooth shapes.