source:Other information release time:2023-02-08 Hits: Popular:PCB Assembly company
The oxidation of the Shenjin line board is pollution of impurities on the surface of the golden surface. After the impurities attached to the gold surface, the discoloration of the golden surface that we often say is often said. In fact, the statement of golden surface oxidation is inaccurate. Gold is an inert metal. Under normal conditions, no oxidation occurs. Instead, impurities attached to the gold surface such as copper ions, nickel ions, and microorganisms are prone to oxidation and deterioration in normal environments to form golden surface oxidation Best.
There are the following characteristics by observing the oxidation of the golden board:
1. Improper operation causes pollutants to be attached to the gold surface, for example: unclean gloves, finger covers contact gold, golden boards and unclean counters, the location of the golden board pad, the pads contact pollution, etc.; here The oxidation area is large and may appear on multiple neighboring pads at the same time. The appearance color is lighter and easier to clean.
2. Half -plug holes, small -range oxidation near the holes; this type of oxidation is due to the non -cleaning of the potion in the perforated or semi -congestion or the residual water vapor in the hole. Dark brown oxides;
3. Poor water quality causes impurities in the water body to adsorb on the gold surface, for example: washing water after Shen Jin, washing the finished plate washing machine; this type of oxidation area was small and usually appeared at the corners of individual pads. Water stains; water droplets will be left on the pads on the pads of the golden board. If the water body contains more impurities, the droplets will evaporate and shrink to the corners when the plate temperature is high. At the corner of the pad; the main pollutant of the water washing after Shen Jin, and the washing of the finished plate washing machine was microorganus, especially the use of DI water tanks is more suitable for bacteria breeding. Dead corners of the trough wall, depending on whether there is a smooth feeling, if so, it means that the water body is polluted;
4. Analyze the customer's return board, find that the golden surface is poorly dense, the nickel surface is slightly corrosive, and the oxidation place contains an abnormal element CU. After this type of oxidation is removed, it still comes out, and there is a risk of oxidation again.
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