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When the line conductor to be electroplated is isolated and cannot be used as an electrode, only electroless plating can be performed. General chemical plating used in the bath has a strong chemical effect, and chemical gold plating process is a typical example. Electro less gold plating is a very high alkaline aqueous solution. When using this plating, it is prone to drill under the coating layer, especially if the cover film laminating process quality management is not strict with low bonding strength, this problem can happen more easily.
