一 级 黄 色 片免费网站丨熟女精品视频一区二区三区丨日本精品人妻无码77777丨国产动作大片中文字幕丨亚洲日韩乱码久久久久久

Waterproof connectorThe surface coating of the outer shell and copper needle is related to the quality of the product, and the selection of materials and manual labor need to be closed to ensure that the produced product is the best for the user.

1. Cyanide free self ionic liquid gold plating organic chemistry: Na3Au (so3) 2 is used as the main salt to contact the water resistant connector, and the thickness of the gold layer can reach 1.6m.

2. Pure palladium electromigration: Ni can cause allergic dermatitis. The European Commission has long refused to import jewelry containing nickel, and palladium is the best substitute for nickel. It includes two processes. One type is a thin palladium ferry, with a thickness of 0.0~0.3 μ m. Used as an anti rust abstract coating and anti silver anti discoloration layer on white copper and tin; Another type is palladium thick electric ferry, thin to 3 μ m. No cracks (currently at the level of the League of Nations). Due to the high cost of palladium, it has not yet entered the domestic market.

3. Trivalent chromium zinc coating white blue and color passivator: trivalent chromium salt is used as carcinogenic hexavalent chromium salt. After more than 27 hours of white blue passivation treatment in a neutral salt spray laboratory, the color such as coating has been honed in the market for 20 years.

4. Cyanide free bright copper: gradually pre plated and thickened in copper alloy waterproof joints, with a coating thickness of up to 10m, such as acidic bright copper coating. If blackening treatment can achieve dark effect, it has been running normally for 2 years at 10000 liters.

5. Cyanide free bright gold coating: a common sulfur based sulfate dominant complexing agent, high polar organic compound dominant complexing agent, without sulfur content. All bright coatings have a film thickness of up to 40m, surface resistivity>54cm, and tensile strength.

6. Formaldehyde free self ionizing liquid organic chemical plating roll: used for through plating of printed circuit boards and surface metallization of non-conductors. The removal of harmful substances is replaced by cheap and harmless hypophosphite, and there is no politicized product at home and abroad. Mainly discussed in the laboratory. The rotational speed of Igneous rock is 3~4 μ M/h, with a service life exceeding 10 cycles (MTO), and a dense and bright coating. But it needs to be refined and tested.

The above six coatings all have their own characteristics. Whether it is the surface layer of waterproof connectors or the contact parts, it is necessary to first confirm the material type, then change the coating method, and then determine the main parameters of the coating.