Surface finish or surface finish is the last production process to coat copper coating on PCB, so as to prevent oxidation well. Each type is as follows:<br><br>OSP is coated with copper by organic lead-free coating, and its working characteristics are similar to those of fluorinated coating after PCB surface treatment.<br>Silver immersion: it is a lead-free and environmentally friendly silver coating, and it is an electroplating that can improve the conductivity.<br>Hot air welding liquid level: the lead-tin wire is leached by HASL method, that is, the whole PCB board is immersed in a lead melting pool at a temperature of about 300°C, and then blown out by an air knife.<br>Gold plating: it is a kind of all-gold plating, which is suitable for tasks that require high conductivity or contact and relatively high cost.<br><br><br>The Surface Finish department uses X-Ray Fischer and X-Ray CMI to check the Surface appearance and thickness. This is the only department that measures the Surface Thichness according to MI control. As long as it does not exceed Spec, it will damage customer rejection and the company.
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