Patent ID: 6068709
Filing Date: 2000-05-30
Classification: C23C

Abstract:
A process for the phosphatization of metallic substrates selected from the group consisting of aluminum, an aluminum alloy, steel, steel coated with zinc, and steel coated with a zinc alloy, wherein the zinc alloy comprises another metal selected from the group consisting of iron, nickel, aluminum, and manganese, the process comprising, phosphatizing the metallic substrate in a bath comprising as accelerator a trivalent cobalt complex selected from the group consisting of[Co(NH.sub.3).sub.6 ]Cl.sub.3[Co(NO.sub.2).sub.6 Na.sub.3[Co(en).sub.3 ](NO.sub.3).sub.3 with en=ethylenediamine[Co(pn).sub.3 ](NO.sub.3).sub.3 with pn=diamino 1-2 propane[Co(oxalate)en.sub.2 NO.sub.3[Co(citrate)(CO.sub.3)]Na.sub.2[CoF(NH.sub.3).sub.5 ](NO.sub.3).sub.2and[Co(NO.sub.3)(NH.sub.3).sub.5)(NO.sub.3).sub.2.2.