The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 13, 2002
Filed:
Feb. 08, 2000
Zoran Minevski, The Woodlands, TX (US);
Jason Maxey, College Station, TX (US);
Carl Nelson, Bryan, TX (US);
Cahit Eylem, College Station, TX (US);
Lynntech, Inc., College Station, TX (US);
Abstract
A conversion coating solution and process forms a stable and corrosion-resistant layer on metal substrates or layers or, more preferably, on a boehmite layer or other base conversion coating. The conversion coating process involves contacting the substrate, layer or coating with an aqueous alkali metal isomolybdate solution in order to convert the surface of the substrate, layer or coating to a stable conversion coating. The aqueous alkali metal molybdates are selected from sodium molybdate (Na MoO ), lithium molybdate (Li MoO ), potassium molybdate (K MoO ), or combinations thereof, with the most preferred alkali metal molybdate being sodium molybdate. The concentration of alkali metal molybdates in the solution is preferably less than 5% by weight. In addition to the alkali metal molybdates, the conversion coating solution may include alkaline metal passivators selected from lithium nitrate (LiNO ), sodium nitrate (NaNO ), ammonia nitrate (NH NO ), and combinations thereof; lithium chloride, potassium hexafluorozirconate (K ZrF ) or potassium hexafluorotitanate (K TiF ).