A reading of the purpose and characteristics of PCB electroplating zinc
The purpose of PCB electro-galvanizing is to prevent steel objects from being corroded, to improve the corrosion resistance and service life of steel, and also to increase the appearance of decorative products. Steel will be weathered over time, and water or mud will corrode. The steel that is eroded every year in China accounts for almost one-tenth of the entire steel volume. Therefore, in order to protect the service life of steel or its parts, PCB electro-galvanizing is generally used to process steel.
Since zinc does not change easily in dry air, and it is more likely to produce a basic zinc carbonate film in a humid environment, this film can protect internal parts from corrosion damage, even if the zinc layer is damaged by certain factors. In this case, the combination of zinc and steel over a period of time forms a microbattery, which protects the steel substrate as a cathode.
Zinc is a white, shiny metal. Atomic number 30, relative atomic mass 65.4, brittle and hard, melting point 419.4°C, boiling point 907°C, valence +2, relative density 7.1. Zinc is stable in dry air. Zinc is an amphoteric metal and reacts with acids and bases to release hydrogen gas. It also reacts with hydrogen sulfide. A layer of basic zinc carbonate film is formed in water or moist air to protect the underlying layer from corrosion.
Zinc plating on iron, because of its negative potential, is anodized coating and has good electrochemical protection. Therefore, galvanization (plus passivation with chromate after plating) is widely used to prevent corrosion of ferrous metals. It has been widely used in electroplating electrical parts, mechanical hardware, construction hardware and defense industry.
Zinc is mainly used in the industry for electroplating, hot dip coating, battery industry, and manufacturing alloys (such as brass).
Summary PCB electroplating zinc has the following characteristics:
1. Good anti-corrosion, fine and uniform combination, not easy to enter into the interior by corrosive gas or liquid.
2. Because the new layer is relatively pure, it is not easy to be corroded under the conditions of acid or alkali. Long-term effective protection of steel body.
3, after the passivation of chromic acid to form a variety of colors used, can be selected according to the customer's favorite, galvanized beautiful and generous, with decorative.
4, the zinc coating has a good ductility, in a variety of bending, handling impact will not easily fall.
Budget Laptop For Students is a great gift parents like to prepare for their children. There are too many choices on the market, so how to choose a right one for your children? 10.1 inch Low Budget Laptop For Students is design for kids, like below 10 years; 14.1 inch n4020 64gb Budget Friendly Laptops For Students is the most competitive and hot one for student project; 15.6 inch n5095 128gb Budget Friendly Laptops For Students is the best one for middle or high school student or teacher online teaching; Of course, also have High Quality Cheap Laptops with i3, i5, i7 10th or 11th; 15.6 inch or 16.1 inch i7 Affordable Laptop With Good Specs and dedicated graphics. Other 11.6inch celeron budget friendly laptops in 2 in 1 or yoga type also available.
Therefore, you can share your recent and powerful hardware interest, then we can recommend the right one for you. Of course, can customize as your special requirements.
In fact, the most easiest way is what you share the details, like size, cpu, ram, rom, pcs, oem service, screen, camera, etc.
Budget Laptop For Students,Low Budget Laptop For Students,Budget Friendly Laptops For Students,Affordable Laptop With Good Specs,High Quality Cheap Laptops,Budget Friendly Laptops
Henan Shuyi Electronics Co., Ltd. , https://www.shuyitablet.com