Polymetalate and heteropolymetalate conversion coatings for metal substrates
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United States of America Patent
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Mar 8, 2005
Grant Date -
Jul 3, 2003
app pub date -
Dec 30, 2002
filing date -
Dec 15, 1998
priority date (Note) -
Expired
status (Latency Note)
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Abstract
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 M.sub.x O.sub.y.sup.n-, where M is selected from the group comprising Mo, V and W. The heteropolymetalates have the general formula BM.sub.x O.sub.y.sup.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, (PMo.sub.12 O.sub.40).sup.3-, (PMo.sub.10 V.sub.2 O.sub.40).sup.5-, (MnPW.sub.11 O.sub.39).sup.5-, (PW.sub.12 O.sub.40).sup.3-, (SiMo.sub.12 O.sub.40).sup.4-, (SiW.sub.12 O.sub.40).sup.4-, (Mo.sub.7 O.sub.24).sup.6-, (CeMo.sub.12 O.sub.42).sup.8- and mixtures thereof.
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