2 pin 6189-0640 Automotive Camshaft Position Sensor Plug Waterproof Connector Socket 2.0 Series

03. Coating performance verification
The brass-based automobile terminals that were plated with white bronze for 2 minutes were tested by an X-ray coating thickness gauge and the coating was 0.5 μm.
Use FEISirion200 field emission scanning electron microscope to observe the crystallization of the coating, and use an energy spectrometer to determine the elemental composition and proportion of the coating. It can be seen that the coating has dense crystallization and no voids.
The energy spectrum analysis shows that the coating is composed of two elements, Sn and Cu. Through quantitative analysis of the energy spectrum, it is determined that the mass fraction is 12.11% copper and 87.89% tin.
EDS spectrum of coating
According to the automotive industry standard QC/T417-2001 Part 2, 4.3 Determination of insertion force and extraction force, 4.16 Salt spray test measurement, 4.8 Contact resistance, the insertion force, extraction force, corrosion resistance and contact resistance are measured at 150℃ Place it in the oven for 10 hours to measure its resistance to matrix zinc thermal diffusion test to check the coating's resistance to discoloration.
At the same time, use the DJ621-6.3A plug and DJ621-6.3B socket that are plated with 0.5μm copper and then plated with 2.μm tin or directly plated with 2.0μm tin. The same method is used to measure the insertion force, insertion and extraction force, corrosion resistance, contact resistance and Zinc diffusion resistance, the results are compared with the terminal performance of direct electroless white bronze plating 0.5μm, the results are shown.
It can be seen that after electroless plating of 0.5 μm white bronze coating on automobile terminals, not only the insertion and extraction forces of the terminals are reduced by more than 10N compared with those of tin and copper-tin plating, but also compared with uncoated terminals. There is a significant change, and the contact resistance also decreases to a certain extent; the salt spray test results show that its corrosion resistance exceeds 0.5μm copper plating + 2.0μm tin plating; its resistance to zinc diffusion and discoloration is good, consistent with 0.5μm copper plating + 2.0μm tin plating. It shows that the 0.5μm white bronze coating can have lower contact resistance, good corrosion resistance and resistance to zinc diffusion and discoloration while reducing the insertion and extraction force, and improves the correlation of electroplated terminals without the need for the 0.5μm copper plating process.
At present, the wire harness terminals used in automotive connectors are mainly stamped from high-quality copper alloys. In order to protect the terminal base material from corrosion and optimize the surface performance of the terminal, the terminals are usually subjected to matte tin, reflow bright tin, Different surface treatments such as tin-lead, silver, gold and palladium-nickel flash gold are what we often call terminal surface plating, that is, terminal plating.

We know that terminals play two main roles in wire harness connections. One is to fasten with the plastic shell, and the other is to form an electrical connection with the mating terminal. Although copper alloy has good mechanical properties, In terms of electrical conductivity, the performance is unsatisfactory; while materials with good electrical conductivity generally have average mechanical properties, such as tin, gold, silver, etc.

Therefore, plating is extremely necessary to provide terminals with acceptable electrical conductivity and mechanical properties.

Simple instructions：

We have product Catalogue，please contact us on skype，WhatsApp or Email.

If you can't find a product on our website or catalog, We deal with over 10,000 items, our catalog doesn’t cover all products. And we are developing 100+ molds yearly, which means around 10 new products are created in our factory. So don’t go away, just send us your photo or part no, we’ll check for you.