FAQ
What is the electroplating process?
Electroplating is a surface processing method in which the cationic ions of the metallogenic group are deposited on the metal surface of the substrate by electrolysis in a salt solution containing the metallogenic group.
What is the purpose of electroplating?
It is a metal coating on the substrate to change the surface properties or dimensions of the substrate. For example, give the luster of the metal surface beautiful, anti-rust goods, prevent wear and tear; Improve conductivity, lubricity, strength, heat resistance, and weather resistance; Anti-seepage and nitriding of heat treatment; Repair parts of dimensions or abrasions.
What is the function of electroplating?
1. Improve corrosion resistance of metal parts in the use environment.
2. Decorate the appearance of parts to make them bright and beautiful.
3. Improve the working performance of parts, such as hardness, abrasion resistance, conductivity, electromagnetism, heat resistance, etc.
What are the requirements for electroplating?
1. The coating and substrate, including the coating and the substrate, should have good binding force.
2. On the main surface of the parts, the coating should be of uniform thickness and fine structure.
3. The coating shall have a specified thickness and as few pores as possible.
4. The coating shall have specified indicators, such as surface roughness, hardness, color, and salt spray test resistance.
What are polar cathode coatings and anode coatings？
Cathodic coating refers to the fact that under certain conditions, the potential of the coating is positive to that of the matrix metal, otherwise, it is an anodic coating. To determine the coating, the difference between the potential of the coating and the base metal should be determined.
What is a protective coating?
Protective coating: the main function is to protect the matrix metal from corrosion, and there are no decoration requirements for products, such as zinc plating and cadmium plating.
What is a protective-decorative coating?
Protective - decorative coating: in addition to protecting matrix metal, it also makes parts beautiful, such as nickel plating, nickel/chrome plating, copper/nickel/chrome plating, etc.
What is a functional coating?
Functional coating: besides having a certain protective effect, it is mainly used for special working purposes, such as tin plating, silver plating, and hard chromium plating.
What are the properties and uses of zinc coatings?
The zinc coating is an anode coating for steel parts under atmospheric conditions. After color passivation, the protective properties and appearance of the coating are significantly improved. It is mainly used to prevent corrosion of steel parts. Its coating is cheap, has good corrosion resistance, and wide application.
What are the properties and uses of cadmium coatings?
In the environment of the ocean and high-temperature atmosphere, the cadmium coating is an anodic coating for steel parts. The coating is stable, polar coating, stable coating, corrosion resistance, good lubrication performance, and is widely used in the aviation and electronics industry.
What are the properties and uses of tin coatings?
The tin coating has a negative polarity coating on steel parts. Therefore, only when the coating has no porosity can the steel parts be mechanically protected from corrosion. It has high chemical stability, little effect on sulfur and sulfide, good welding performance, and a shielding effect on nitriding.
What are the properties and uses of copper coatings?
The copper coating is a cathodic coating for zinc, iron, and other metals. It is often used in steel or some plastics as the bottom or middle layer of decorative coatings for copper/nickel plating.
What are the properties and uses of nickel coatings?
The nickel coating is a cathodic coating for steel parts, which has higher hardness, higher corrosion resistance than copper, alkali resistance, and acid resistance. Copper/chrome/nickel protection for steel parts - intermediate layer for decorative coatings and preplating before acid copper plating.
What are the properties and uses of chrome coatings?
The chromium coating is a cathode coating for steel parts. It has high heat resistance, good hardness at room temperature, good abrasion resistance, and strong light reflection, and is widely used to improve the wear resistance, light reflection, and repair size and decoration of parts.
What are the properties and uses of silver coatings?
For common metals, silver plating is a cathode coating, which has good conductive and soldering performance and stable chemical properties. It is mainly used for conductive parts and welding parts in the electric appliance industry, as well as protective and decorative coatings, such as Musical Instruments, tableware, optical instruments, and crafts.
What is electrochemical oxidation (anodic oxidation)?
the process of forming a protective, decorative, or other functional oxide film on the surface of a component by electrolysis in a certain electrolyte using a metal component as an anode.
What are the advantages of zinc-nickel alloy coatings?
1. Almost no hydrogen embrittlement
2. Excellent toughness and bonding
3. Higher hardness. Alkaline coating hardness is 90~120HV, while zinc-nickel alloy coating hardness can reach 220~270HV, so it is more resistant to scratching. It can be imitation silver after white blunt, bright plating can be polished with chrome, or can be directly chrome. Zinc-nickel alloy has a high melting point (750~800 °C) and good heat resistance. It has excellent corrosion resistance after dehydrogenation heat treatment and is suitable for use on engines.
