How to deal with the plating of screw fasteners(2)

Update:06 Mar 2020

2. Electroless plating What is electroless plating? It […]

2. Electroless plating
What is electroless plating? It refers to the technology that does not need to be energized. As long as the material is immersed in the plating liquid, the gold-plated metal can be separated out. The reduction reaction is based on a chemical reaction, so it is also called chemical plating.
Compared with electroless plating and electroplating, the formed electroplated coating is more uniform, so it is suitable for materials with very complex shapes and materials that require high dimensional accuracy. Not only that, the coating formed by electroless plating also has excellent Mechanical properties such as hardness and abrasion resistance, as well as excellent electromagnetic properties, and the typical electroless plating includes nickel plating, tin plating, gold plating, silver plating, copper plating, etc. Not only that, it cannot be used for plastic and ceramic products. The general materials can also be electrolessly plated.
Screw fasteners often use this electroless nickel and phosphorus alloy plating, which has the advantage that even a screw product such as a thread with a very complicated shape can open a uniform coating on the surface without spots.
3. Anodizing treatment.
Anodizing treatment is also a very common surface treatment method. It is a screw fastener that needs to be plated with hydrogen as an anode. It is immersed in a solution containing anions of the metal that is expected to adhere to the surface of the material, and the metal is deposited on the surface Technology, mostly used for surface treatment of aluminum products. In addition, because electroplating uses screw fasteners that require gold plating as the cathode, the power source for anodizing is exactly the opposite of electroplating. Anodizing is also called alumina film treatment, and it can achieve the effects of hardening and coloring.
Because aluminum and oxygen are easy to hold together, it is very easy to form a thin oxide coating on the surface when exposed to air, so it can be said to have good corrosion resistance. However, because this oxide coating is very thin, it may be corroded by chemical reactions in some environments. For this reason, aluminum products must be surface-treated for the purpose of protecting the surface.