967542-1 1241388 1-968849-1 1928498651 1241394-1 1241388-1 12413946-1 1241390-1 Automotive Wire Crimping Terminal Metal Splice 1-0968849-1

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First of all, we need to know why other metals are plated on the surface of the conductor? Because the performance of a connector is basically determined by its surface, such as surface pollution, oxidation, secondary oxidation, formation, and corrosion of sulfides. These surface pollution increases contact resistance and is harmful to connection reliability. Therefore, to ensure that the contact resistance of the contact surface is at a lower level and long -term stability is the prerequisite to achieve reliable connection. By appropriately changing the thickness and process of the plating layer within a certain range, the different performance of the plating can be obtained. Ensure for long -term stability of contact resistance. Secondly, why does copper choose silver plating, tin plating or nickel plating? Because naked copper is prone to generate high-oxide copper with high resistivity in the air (the resistivity of the copper oxide copper is 5x10^8Ω.m, and the resistance of pure copper is 0.0175x10^(-6) ω.m), and and the ω.m), and the pure copper, and the pure copper, The thickness is related to temperature and time. Copper in the atmosphere, the resistance of metal-metal contact during the beginning of the atmosphere is relatively low, but due to the existence of oxygen in the atmosphere, the continuous oxidation process will increase the contact resistance rapidly, resulting in overheating surfaces, easily trigger fires, etc. Safety accidents, so if it is pure copper overlap, you need to polish the oxidation layer on the contact surface in advance before matching to ensure low contact resistance.

The oxides of tin, nickel, and silver (in an environment without sulfur) have low thickness over time, and the temperature has little effect, especially the oxides of silver have no effect on contact. It is the best, see Table 1 below.

Copper silver plating has obvious advantages in ensuring low resistance and stability of the contact surface, but it is easy to change color in sulfur -containing, giving users an illusion, and it is easy to cause misunderstandings. Can it be changed to tin -plated or nickel plating directly?

Let's review GB 14048.1-2012 Low-voltage switch equipment and control equipment part 1: The requirements of the terminal temperature rise in the general rules are shown in Table 2 below. For naked copper terminals, its temperature rise limit is 60K, tin -plated terminals are 65K, silver -plated or nickel -plated terminals are 70K.

In the "Electrical Science" of Professor Zhang Guansheng of Fuzhou University and GB/T25840-2010, in the materials such as the guidelines allowed by the warm rise of electrical equipment (especially the wiring terminal), the relationship between the carrier load and the temperature rise is: Wen Sheng and the temperature rise and the temperature rise are: Wen Sheng and the temperature rise and the temperature rise are: Wen Sheng and the temperature rise and rise Position of the current P is directly proportional. The P value depends on the surface heat dissipation coefficient of the conductor, usually between 1.5 and 2, and the average value is generally 1.76. The higher the allowable value of the warming, the greater the current that the conductor allows the flow. Based on the above theory, the load capacity of the same specifications of nude copper, copper -plated, and copper silver -plated terminals is as follows. Through comparison, it will be found that the "allowable current" after copper is plated by nearly 20%relative to naked copper, so without changing the conductor specifications, only by changing the plating layer, you can obtain the "allowed load ability" to be "allowed to load ability". promote.

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