电镀溶液表面张力过大，湿润剂不足。
Plating solution surface tension is too large, wetting agents insufficient.
丙二醇是“表面活性剂”，或湿润剂、溶解剂，是防冻液中一种主要成分。
As a "surfactant" or wetting agent and solvent, PG is actually the active component in antifreeze.
湿润剂：降低水的表面张力的添加剂；例如：醇。
Wetting agent: An additive, such as alcohol, which decreases the surface tension of water.
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