Surface encyclopedia small knowledge: what is called electroplating plating raw material wholesale where good

Plating (Electroplating) is the use of electrolytic principle in some metal surface on a thin layer of other metal or alloy plating process, is the use of electrolytic action made of metal or other materials adhered on the surface of the parts of a layer of metal film technique to prevent metal oxidation (rust), improve the wear resistance and electric conductivity, reflective and improve aesthetics, and so on.Many COINS are also electroplated.

When electroplating, coating metal or other insoluble material as the anode, to be plated workpiece as the cathode, coating metal cation in the surface of the workpiece to be plated to be reduced to form a coating.In order to eliminate the interference of other cations and make the coating uniform and firm, the solution containing the coating metal cations should be used as electroplating solution to keep the concentration of the coating metal cations unchanged.The purpose of electroplating is to change the surface properties or dimensions of the substrate by placing a metal coating on the substrate.Electroplating can enhance the corrosion resistance of the metal (the coating metal is mostly corrosion-resistant metal), increase the hardness, prevent wear, improve the conductivity, lubricity, heat resistance and surface appearance.

The technique of depositing metal coatings with good adhesion but different properties and substrate materials on mechanical products by electrolysis.Electroplating specific heat immersion layer uniform, generally thin, from a few microns to dozens of microns.Through electroplating, decorative protective and functional surface layers can be obtained on mechanical products, and worn and mis-processed parts can be repaired.

In addition, according to various electroplating requirements have different roles.Examples are as follows:

1. Copper plating: for backing, to improve the adhesion and corrosion resistance of the electrodeposit.(copper is easy to oxidize, after oxidation, the copper no longer conducts electricity, so copper products must be copper protection [1])

2. Nickel plating: base or make appearance to improve corrosion resistance and wear resistance (chemical nickel is more wear resistance than chromium plating in modern technology).(note that many electronic products, such as DIN head and N head, no longer use nickel base, mainly because nickel is magnetic, which will affect the electrical performance of passive intermodulation)

3. Gold plating: improve conductive contact impedance and improve signal transmission.(gold is the most stable and expensive.)

4. Palladium nickel plating: improved conductive contact impedance, improved signal transmission, higher wear resistance than gold.

5. Tin lead plating: it can improve the welding ability and be replaced by other substitutes (most of them are replaced by bright tin and fog tin because of lead).

6. Silver plating: improve conductive contact impedance and improve signal transmission.(silver has the best properties. It is easy to oxidize and conduct electricity after oxidation.)

Electroplating is the process of laying a conductive body with a layer of metal using the principle of electrolysis.

In addition to electrical conductors, electroplating can also be used on specially treated plastics.

The electroplating process is basically as follows:

Attach the plated metal to the anode

The object to be electroplated is attached to the cathode

The anode and cathode are connected by a solution of electrolytes composed of positive ions of the plated metal

After a direct current supply is supplied, the metal in the anode oxidizes (losing electrons), and the positive ions in the solution are reduced (gaining electrons) at the cathode to form atoms and accumulate on the surface of the cathode.

The aesthetics of the electroplated object is related to the current. The smaller the current is, the more beautiful the electroplated object will be.On the contrary, some uneven shapes will appear.

The main USES of electroplating include the prevention of metal oxidation (such as corrosion) and decoration.Many COINS are also electroplated.

Wastewater from electroplating, such as dead electrolytes, is an important source of water pollution.Electroplating process has been widely used in semiconductor and microelectronic parts lead frame process.

VCP: vertical continuous electroplating, new machine for circuit board, better quality than traditional suspended electroplating.

Initially, the breadth of the product.Below centimeter, most curve below centimeter.In the 1930s, a steel plant had a special production line for electroplating wider strip steel, using insoluble anodes, supplementation of zinc in the electrolyte with low-grade ore and ore fragments, filtration and purification circulation to maintain the composition of the electroplating solution.In 1939, the Weirtonsteel tin line was galvanized.HubbleWeisberg electroplating solution was used, and the complex salt of ammonia and zinc chloride was added.The ammunition box is damaged by rust. In order to make it corrosion-resistant, the tin-plated operation line is changed to strip steel operation line.

Local silver plated

Aluminum parts electroplating solution formula process flow:

High temperature weak alkali etching → cleaning → pickling → cleaning → zinc immersion → cleaning → secondary zinc immersion → cleaning → pre-plating of copper → cleaning → cyanide plating of silver → recovery washing → cleaning → leaching → cleaning → drying.

From the point of view of the technological process, the selected protection material must be resistant to high temperature (80℃ or so), alkali and acid. Secondly, the protection material can be easily stripped after silver plating.

The protection materials on the market include peeling rubber, peeling paint, general adhesive tape and tape.The acid resistance, alkali corrosion resistance, high temperature resistance (the highest temperature of alkali corrosion solution is about 80℃) and stripping ability of these protective materials were tested respectively.

Electroplating raw materials wholesale which good, recommend shenzhen hengdi yuan runda industrial co., LTD., welcome to consult!