有些情况下﹐若镀液中主盐的金属离子为简单离子时﹐则镀层晶粒粗大﹐因此﹐要采用络合离子的镀液。
In some cases, if the salt solution of the metal ion content for simple ion, the coating, therefore, coarse grains to adopt complexation ion of plating solution.
络合剂：能与金属离子或含有金属离子的化合物结合而形成络合物的物质。
Complexing agent: can with metal ions or containing metal ions compounds formed the material with complex.
电极测定的是特定的离子形式而不是络合形式。
Electrodes measure specific ionic species and not complexes of the species.
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