Cleaning and liquid contact with solids – Processes – For metallic – siliceous – or calcareous basework – including...
Patent
1998-06-22
1999-12-14
Stinson, Frankie L.
Cleaning and liquid contact with solids
Processes
For metallic, siliceous, or calcareous basework, including...
134 41, 510426, 510492, 510504, 510506, B08B 308, C23G 102, C11D 122, C11D 162, C11D 165
Patent
active
060011866
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to inhibitors, compositions, and processes for deoxidizing and/or cleaning surfaces of aluminum and titanium and their alloys that contain at least 45% by weight of aluminum or titanium. "Deoxidizing" is to be understood herein as the removal from the surface of metals of oxide films and other adherent inorganic materials that would reduce adhesion to subsequently applied protective coatings such as conversion coatings and/or paints and the like, and "cleaning" means removal of all other foreign materials, especially organic soils and poorly adherent inorganic substances such as metal dust and the like, that would reduce adhesion to such subsequently applied protective coatings.
2. Statement of Related Art
With most deoxidizing agents, especially acidic aqueous liquid compositions with substantial free fluoride ion activity, which are probably the most effective chemical class of cleaners and deoxidizers for aluminum and titanium now known, there is a perceptible but controlled etching or dissolution of the underlying aluminum or titanium while the deoxidizing agent is in contact with it. Such etching is often harmless or even desirable, as when it improves the smoothness of the metal surface being treated. In some instances, however, particularly where very narrow dimensional tolerances on the substrate need to be maintained, effective cleaning and deoxidizing with little or no etching is desirable, but heretofore has been very difficult to obtain.
DESCRIPTION OF THE INVENTION
Object of the Invention
The primary object of the invention is to provide compositions and processes for cleaning and/or deoxidizing metal surfaces with little or no etching. Other objects will be apparent from the description below.
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, however. Also, unless expressly stated to the contrary: percent, "parts of", and ratio values are by weight; 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 counter-ions to produce electrical neutrality for the composition as a whole, and 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; the term "mole" means "gram mole", and "mole" and its grammatical variations may be applied herein, mutatis mutandis, to ionic or any other chemical species with defined numbers and types of atoms, as well as to chemical substances with well defined conventional molecules.
SUMMARY OF THE INVENTION
It has been found that a combination of quaternary aryl ammonium salts and di-anionic functional substituted compounds containing at least two aryl moieties have a synergistic effect when present together in acidic fluoride containing aqueous liquid compositions, so that such compositions are substantially as effective in cleaning and deoxidizing aluminum and titanium substrates as are previously known acidic fluoride containing aqueous liquid compositions without the quaternary ammonium
REFERENCES:
patent: 4116853 (1978-09-01), Binns
patent: 4370173 (1983-01-01), Dollman
patent: 5052421 (1991-10-01), McMillen
patent: 5393447 (1995-02-01), Carlson et al.
patent: 5486316 (1996-01-01), Bershas et al.
patent: 5584943 (1996-12-01), Banaszak et al.
Carlson Lawrence R.
Johnson Philip M.
Chaudhry Saeed
Henkel Corporation
Jaeschke Wayne C.
Stinson Frankie L.
Szoke Ernest G.
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