Metal treatment – Process of modifying or maintaining internal physical... – Processes of coating utilizing a reactive composition which...
Patent
1996-05-29
1999-04-27
Kastler, Scott
Metal treatment
Process of modifying or maintaining internal physical...
Processes of coating utilizing a reactive composition which...
146267, C23C 2200
Patent
active
058977163
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to processes of treating metal surfaces with aqueous acidic compositions to increase the resistance to corrosion of the treated metal surface, either as thus treated or after subsequent overcoating with some conventional organic based protective layer, and to increase the adhesion of such a protective layer.
2. Statement of Related Art
A very wide variety of materials have been taught in the prior art for the general purposes of the present invention, but most of them contain hexavalent chromium or other inorganic oxidizing agents which are environmentally undesirable.
DESCRIPTION OF THE INVENTION
Objects of the Invention
A major object of the invention is to provide a storage stable treatment composition and process that can be substantially free from hexavalent chromium but can protect metals substantially as well as the hexavalent chromium containing treatments of the prior art. Other alternative or concurrent objects are to provide faster processing speed, better protection against corrosion, more economical operation, improved stability of the treatment compositions, and less adverse environmental impact.
General Principles of Description
Except in the claims and the operating examples, or where otherwise expressly indicated, all numerical quantities in this description indicating amounts of material or conditions of reaction and/or use are to be understood as modified by the word "about" in describing the broadest scope of the invention. Practice within the numerical limits stated is generally preferred. Also, unless expressly stated to the contrary: percent, "parts of", and ratio values are by weight; the term "polymer" includes "oligomer", "copolymer", "terpolymer", and the like; the description of a group or class of materials as suitable or preferred for a given purpose in connection with the invention implies that mixtures of any two or more of the members of the group or class are equally suitable or preferred; description of constituents in chemical terms refers to the constituents at the time of addition to any combination specified in the description, and does not necessarily preclude chemical interactions among the constituents of a mixture once mixed; specification of materials in ionic form implies the presence of sufficient counterions to produce electrical neutrality for the composition as a whole (any counterions thus implicitly specified should preferably be selected from among other constituents explicitly specified in ionic form, to the extent possible; otherwise such counterions may be freely selected, except for avoiding counterions that act adversely to the objects of the invention); and the term "mole" and its variations may be applied to elemental, ionic, and any other chemical species defined by number and type of atoms present, as well as to compounds with well defined molecules.
SUMMARY OF THE INVENTION
It has been found that the objects of the invention can be achieved by acidic aqueous compositions comprising, preferably consisting essentially of, or more preferably consisting of water and: H.sub.2 ZrF.sub.6, H.sub.2 HfF.sub.6, H.sub.2 SiF.sub.6, H.sub.3 AlF.sub.6, H.sub.2 GeF.sub.6, H.sub.2 SnF.sub.6, HBF.sub.4, and mixtures thereof; and carboxylic acids that contain at least two hydroxyl groups, exclusive of the hydroxyl groups that are part of any carboxyl groups, per carboxyl group in each acid molecule and the water soluble salts of such acids; and, optionally, one or more of the following: Hf, Al, Si, Ge, Sn, and B and the oxides, hydroxides, and carbonates of all of these elements; (ii) water soluble and water dispersible polymers and copolymers of one or more x-(N--R.sup.1 --N--R.sup.2 -aminomethyl)-4-hydroxy-styrenes, where x=2, 4, 5, or 6, R.sup.1 represents an alkyl group containing from 1 to 4 carbon atoms, preferably a methyl group, and R.sup.2 represents a substituent group conforming to the general formula H(CHOH).sub.n CH.sub.2 -, where n is an integer from 1 to 7, preferabl
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Korinek Karl
Reghi Gary
Henkel Corporation
Jaeschke Wayne C.
Jaeschke, Jr. Wayne C.
Kastler Scott
Wisdom, Jr. Norvell E.
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