| 摘要 |
The present invention provides a conversion coating solution containing polymetalates and/or heteropolymetalates to oxidize the surface of various metal substrates. The polymetalates have the general formula MxOy<n->, where M is selected from the group comprising Mo, V and W. The heteropolymetalates have the general formula BMxOy<n->, where B is a heteroatom selected from P, Si, Ce, Mn or Co, and M is again selected from Mo, V, W or combinations thereof. The concentration of polymetalates and/or heteropolymetalates anions is preferably between about 1 % and about 5 % by weight. Examples of typical anions used include, but are not limited to, (PMo12O40)<3->, (PMo10V2O40)<5->, (MnPW11O39)<5->, (PW12O40)<3->, (SiMo12O40)<4->, (SiW12O40)<4->, (Mo7O24)<6->, (CeMo12O42)<8-> and mixtures thereof.
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