锌盐磷化膜由Zn3(PO4)2•4H2O与Zn3Fe(PO4)3•4H2O组成,分别以H及P代号表示。P比是两种磷酸盐结晶含量之比,其表达式为()。A、P/HB、P/[P+H]C、H/PD、H/[H+P]
锌盐磷化膜由Zn3(PO4)2•4H2O与Zn3Fe(PO4)3•4H2O组成,分别以H及P代号表示。P比是两种磷酸盐结晶含量之比,其表达式为()。
- A、P/H
- B、P/[P+H]
- C、H/P
- D、H/[H+P]
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