Anti-corrosion and low friction coating

Abstract

The anti-corrosion coating material contains corrosion inhibiting inorganic constituents, or a combination of inorganic and organic corrosion inhibiting constituents, suspended in a polymeric resin. The corrosion resistant composition includes a salt of inorganic constituents, and alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt (PCAS) as a corrosion inhibitor, suspended in a polymeric resin remainder. The coating material may be applied to metal parts but not limited to aircraft fasteners, such as aircraft fastener parts, including nuts and bolts, screws, rivets, and sleeved systems.

1 . In a part having an exterior anti-corrosion coating containing a corrosion resistant composition, the improvement wherein said corrosion resistant composition as applied comprises:
 approximately 4 to 8% by weight of a salt of inorganic constituents formed from cations selected from the group consisting of zinc and calcium, and anions selected from the group consisting of silicates, phosphates, carbonates and oxides;   approximately 2 to 15% by weight of an alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt as a corrosion inhibitor; and   said salt of inorganic constituents and said alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt being suspended in a remainder comprising a polymeric resin, and the resulting coating being dried and baked.   
     
     
         2 . The improvement of  claim 1 , wherein said remainder further includes polytetrafluoroethylene. 
     
     
         3 . The improvement of  claim 1 , wherein said remainder further includes a pigment selected from the group consisting of molybdenum disulfide, aluminum, polypropylene, and combinations thereof. 
     
     
         4 . The improvement of  claim 1 , wherein said corrosion resistant composition is dissolved in a volatile solvent carrier. 
     
     
         5 . The improvement of  claim 1 , wherein said salt of inorganic constituents has a particle size of 10 microns or less. 
     
     
         6 . The improvement of  claim 1 , wherein said corrosion resistant composition is dissolved in a volatile solvent carrier, and the exterior coating of the part is dried and baked. 
     
     
         7 . The improvement of  claim 1 , wherein said part includes a fastener. 
     
     
         8 . The improvement of  claim 1 , wherein said polymeric resin includes a phenol-formaldehyde thermosetting resin. 
     
     
         9 . The improvement of  claim 1 , wherein said polymeric resin includes a water based polymeric resin. 
     
     
         10 . A method of providing an anti-corrosion coating on a part of a fastening system, comprising the steps of:
 providing a corrosion resistant coating including approximately 4 to 8% by weight of a salt of inorganic constituents formed from cations selected from the group consisting of zinc and calcium, and anions selected from the group consisting of silicates, phosphates, carbonates and oxides; and approximately 2 to 15% by weight of an alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt as a corrosion inhibitor;   suspending said salt of inorganic constituents and said Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt in a remainder comprising a polymeric resin to form an anti-corrosion coating;   applying said anti-corrosion coating to a part; and   drying and baking said anti-corrosion coating on the part.   
     
     
         11 . The method according to  claim 10 , wherein suspending in said remainder further includes suspending in the remainder including polytetrafluoroethylene. 
     
     
         12 . The method according to  claim 10 , wherein suspending in said remainder further includes suspending in the remainder including a pigment selected from the group consisting of molybdenum disulfide, aluminum, polypropylene, and combinations thereof. 
     
     
         13 . The method according to  claim 10 , further including providing the corrosion resistant composition dissolved in a volatile solvent carrier before applying. 
     
     
         14 . The method of  claim 10  wherein providing the salt of inorganic constituents includes providing said salt of inorganic constituents in a particle size of 10 microns or less. 
     
     
         15 . The method of  claim 10 , wherein the suspension in the remainder is dissolved in a volatile solvent carrier, the solution is applied to the part and the coating of the part is dried and baked. 
     
     
         16 . The method of  claim 10 , wherein applying the anti-corrosion coating to a part includes applying the coating to a fastener. 
     
     
         17 . The method of  claim 10 , wherein suspending said salt of inorganic constituents and said Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt in a remainder including said polymeric resin includes suspending said salt of inorganic constituents and said alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt in a remainder including a phenol-formaldehyde thermosetting resin. 
     
     
         18 . The method of  claim 10 , wherein suspending said salt of inorganic constituents and said alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt in a remainder including a polymeric resin includes suspending said salt of inorganic constituents and said alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt in a remainder including a water based polymeric resin. 
     
     
         19 . The method of  claim 10  wherein providing a corrosion resistant coating includes providing approximately 3 to 5% by weight of an alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt. 
     
     
         20 . The method of  claim 19  wherein providing a corrosion resistant coating includes providing alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt wherein the alkoxy is selected from the group of methoxy- and ethoxy-. 
     
     
         21 . The method of either of  claim 19  or  claim 20  wherein providing a corrosion resistant coating includes providing alkaline Poly(3-ammoniumpropylalkoxysiloxane) Carboxylic Acid Salt wherein the carboxylic acid is selected from the group of heptanoic, octadecanoic, dodecanoic or benzoic acids. 
     
     
         22 . The method of  claim 10  wherein providing a corrosion resistant coating includes providing approximately 2 to 15% by weight of Poly(3-ammoniumpropylethoxysiloxane)dodecanoic acid salt. 
     
     
         23 . The method of  claim 22  wherein providing a corrosion resistant coating includes providing approximately 3 to 5% by weight of Poly(3-ammoniumpropylethoxysiloxane)dodecanoic acid salt. 
     
     
         24 . A corrosion resistant composition, the composition consisting essentially of:
 4 to 8% by weight of a salt of inorganic constituents formed from cations selected from the group consisting of zinc and calcium, and anions selected from the group consisting of silicates, phosphates, carbonates and oxides;   2 to 15% by weight of an alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt as a corrosion inhibitor;   said salt of inorganic constituents and said alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt being suspended in a remainder of 10 to 40% by weight of a polymeric resin having polytetrafluoroethylene, a pigment selected from the group consisting of molybdenum disulfide, aluminum, polypropylene, and combinations thereof; and   40 to 90% carrier solvent.   
     
     
         25 . The composition of  claim 24  wherein the carrier solvent is a volatile solvent carrier. 
     
     
         26 . The composition of  claim 24  wherein the carrier solvent is a low molecular weight molecular weight alcohol or methylethylketone. 
     
     
         27 . The composition of  claim 24  wherein said salt of inorganic constituents has a particle size of 10 microns or less. 
     
     
         28 . The composition of  claim 24  wherein said polymeric resin includes a phenol-formaldehyde thermosetting resin. 
     
     
         29 . The composition of  claim 24  wherein said polymeric resin includes a water based polymeric resin. 
     
     
         30 . A coated metal fastener element comprising:
 a metal fastener element having a surface;   a coating on the surface of the metal element wherein the coating includes approximately 15 to 30% by weight of a salt of inorganic constituents formed from cations selected from the group consisting of zinc and calcium, and anions selected from the group consisting of silicates, phosphates, carbonates and oxides, 5 to 30% by weight of an alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt as a corrosion inhibitor, and said salt of inorganic constituents and said alkaline Poly(3-ammoniumpropylalkoxysiloxane) Carboxylic Acid Salt in a remainder of 55 to 80% by weight including a polymeric resin.   
     
     
         31 . The element of  claim 30  wherein the fastener element is either one of a nut and a bolt. 
     
     
         32 . The element of  claim 30  wherein the alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt is present between 10 to 20% by weight. 
     
     
         33 . The element of  claim 30  wherein the alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt is 5 to 30% by weight of Poly(3-ammoniumpropylethoxysiloxane)dodecanoic acid salt. 
     
     
         34 . The element of  claim 30  further including polytetrafluoroethylene. 
     
     
         35 . The element of  claim 30  further including a pigment selected from the group consisting of molybdenum disulfide, aluminum, polypropylene, and combinations thereof. 
     
     
         36 . The element of  claim 30  engaged to a complimentary fastener element having a coating having approximately 15 to 30% by weight of a salt of inorganic constituents formed from cations selected from the group consisting of zinc and calcium, and anions selected from the group consisting of silicates, phosphates, carbonates and oxides, 5 to 30% by weight of an alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt as a corrosion inhibitor, and said salt of inorganic constituents and said alkaline Poly(3-ammoniumpropylalkoxysiloxane)Carboxylic Acid Salt in a remainder of 55 to 80% by weight including a polymeric resin. 
     
     
         37 - 39 . (canceled)