Corrosion inhibiting sol-gel coatings for metal alloys
AssigneeThe Boeing Company
InventorsYoung Jin Chung, Samuel Lee Jeanjaquet, Martin W. Kendig
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Abstract
An anti-corrosive sol-gel that is a combination of an organometallic salt, an organosilane, and a borate, phosphate, or zinc functional component. The organosilane component may be selected from a large group of equivalent compounds but is preferably an alkoxyzirconium salt, and most preferably Zr (IV) n-propoxide. The organosilane may also be selected from a large group of equivalent compounds, but is preferably 3-glycidoxypropyltrimethoxysilane (GTMS). Combination of the components takes place in the presence of an organic catalyst, preferably acetic acid.
Claims11
A chromate-free anti-corrosive sol-gel for use in coating metal surfaces which provides an improved adhesion layer for subsequent surface coatings, said treatment comprising:
- an organometallic;
- an organosilane;
- an organic acid;
- and,
- an anti-corrosion compound having functionality selected from the group consisting of borates, phosphates, zinc, and combinations thereof,
- wherein the anti-corrosion compound is present in an amount between about 5 mol % and about 10 mol % with respect to the combined organometallic and organosilane content of the sol-gel.
A chromate-free anti-corrosive surface treatment comprising
- a) about 7.0 wt % to about 9.0 wt % 3-glycidoxyprophyltrimethoxysilane;
- b) about 1.0 wt % to about 3.0 wt % Zr (LV) n-propoxide;
- c) about 0.5 wt % to about 1.5 wt % acetic acid;
- d) about 2.5 wt % to about 7.5 wt % water;
- e) about 77.0 wt % to about 88.2 wt % methanol;
- and
- f) about 0.2 wt % to about 2.0 wt % of a phosphate containing compound.
Dependencies are inferred from the claim text.