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Vapor phase corrosion inhibitor-desiccant material
| Details |
Inventors: Miksic, Boris A.; Foley, Joseph M.; Tzou, Tsi-Zong;
Assignee: Cortec Corporation (St. Paul, MN)
Primary Examiner: Stoll; Robert L.
Assistant Examiner: Fee; Valerie
Attorney, Agent or Firm: Haugen and Nikolai
A vapor phase corrosion inhibitor-desiccant composite comprising silica gel granules coated with a vapor phase corrosion inhibitor component. The corrosion inhibitor component is selected from a formulation comprising anhydrous molybdates such as ammonium dimolybdate, sodium molybdate and amine molybdates mixed with benzotriazole and sodium nitrate, or from a formulation comprising amine benzoates, amine nitrates and benzotriazole. The composites can be impregnated into foam, extruded with polyolefin films which can additionally be laminated with metallized second film, or encapsulated in an air-permeable container. The corrosion inhibitor formulations have vapor pressures which provide ongoing corrosion protection for susceptible articles situated favorably with respect to the composite. |
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DETAILED DESCRIPTION In accordance with the present invention, a solid phase material has been found which provides a source of vapor phase corrosion inhibiting material along with a substrate of granular silica gel.
The vapor pressure of the composite material is balanced with the quantities normally required to be emitted for effective and long term protection of the metallic surfaces being exposed for treatment.
The formulations of the present invention provide for emission of vapors in a concentration which is appropriate for strong protection of the metallic surfaces, and yet at a rate sufficiently low so as to provide for relatively long-lasting and long-term effective economic treatment.
The presence of granular silica gel as a substrate for the vapor phase corrosion inhibiting component has been found to enhance the protective qualities of the product.
The formulations of the present invention are compatible with and may be impregnated into foam such as an isocyanate-derived polymer foam, or extruded or otherwise deposited with synthetic resinous films, such as aliphatic hydrocarbon or olefinic films such as polyethylene and polypropylene.
Such films may be incorporated with other films in a laminate, and in particular may be combined with a metallized film so as to enhance the static elimination and mechanical properties of the composite.
Additionally, the vapor phase corrosion inhibitor-desiccant composites of the present invention have been found to produce little, if any, visible residue.
The lack of residue enhances the utility of the materials, inasmuch as little, if any, mechanical or electrical problems result from the continuous use of these materials.
Additionally, when granular silica gel component is used as a substrate for the corrosion inhibitor component, smoke and fume evolution of the corrosion inhibitor component is greatly reduced.
Typical corrosion inhibiting articles and materials used in the past are disclosed in Miksic et al U.
S.
Pat.
Nos.
4,051,066 and 4,275,835
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