Coated article and related methods
A coated article comprises an article comprising a surface and a galvanic barrier coating disposed on the surface. The galvanic barrier coating is formed from a galvanic barrier coating composition comprising (a) a thermoplastic resin, (b) an epoxy-based resin, (c) a curing agent, and (d) non-compressible, non-marring microsphere particles. Methods of preparing and using the coated article are also disclosed.
1. A coated article, comprising:
an article comprising a surface; and
a galvanic barrier coating disposed on the surface of the article, the galvanic barrier coating formed from a galvanic barrier coating composition comprising:
(a) from about 60 to about 80 percent by weight of a thermoplastic resin;
(b) from about 15 to about 25 percent by weight of an epoxy-based resin;
(c) from 2.0 to 3.0 percent by weight of a curing agent suitable for cross-linking the epoxy-based resin; and
(d) from about 4 to about 10 percent by weight of non-compressible, non-marring microsphere particles, each based on the total weight of the galvanic barrier coating composition.
2. The coated article of claim 1 , wherein the (a) thermoplastic resin (i) has a melting point within a range of about 170 to about 210° C.; (ii) comprises a polyester resin, a thermoplastic urethane, a polyolefin, a polyamide resin, or combinations thereof; or (iii) both (i) and (ii).
3. The coated article of claim 2 , wherein the (a) thermoplastic resin comprises the polyamide resin, and the polyamide resin is selected from the group of Nylon 6, Nylon 6/10, Nylon 12/12, Nylon 11, Nylon 12, Nylon 6/6, Nylon 6/12, and combinations thereof.
4. The coated article of claim 1 , wherein the (a) thermoplastic resin is a powder having particles with an average diameter of about 160 micrometers.
5. The coated article of claim 1 , wherein the (b) epoxy-based resin comprises the reaction product of an epoxy resin and bisphenol-A.
6. The coated article of claim 1 , wherein the (c) curing agent is present at about 2.5 percent by weight.
7. The coated article of claim 1 , wherein the (c) curing agent is selected from blocked or modified amines, substituted urea, anhydrides, dicyandiamide, imidazoles, and combinations thereof.
8. The coated article of claim 1 , wherein the (d) non-compressible, non-marring microsphere particles are selected from the group consisting of ceramic microspheres, glass microspheres, and steel microspheres.
9. The coated article of claim 8 , wherein the (d) non-compressible, non-marring microsphere particles are the ceramic microspheres, wherein the ceramic microspheres have a particle size in the 95 th percentile of about 35 micrometers.
10. The coated article of claim 1 , wherein the galvanic barrier coating composition is free of ground or crushed glass.
11. The coated article of claim 1 , wherein the galvanic barrier coating composition is solventless.
12. A method of preparing the coated article of claim 1 , said method comprising:
disposing the galvanic barrier coating composition on the surface of the article; and
forming the galvanic barrier coating from the galvanic barrier coating composition to give the coated article.
13. The method of claim 12 , wherein the galvanic barrier coating composition is a powder coating.
14. The method of claim 12 , wherein disposing the galvanic barrier coating composition comprises at least one of spraying, spin-coating, electrostatic spraying, thermal spraying, flame spraying, and fluidized bed coating techniques.
15. The coated article of claim 1 , wherein the article is a fastener and the coated article is further defined as a coated fastener.
16. A method of adjoining adjacent elements with a coated article, said method comprising:
disposing the coated article adjacent and/or through the adjacent elements;
wherein the coated article is the coated article of claim 1 .
17. A coated article, comprising:
an article comprising a surface; and
a galvanic barrier coating disposed on the surface of the article, the galvanic barrier coating formed from a galvanic barrier coating composition comprising:
(a) from about 60 to about 80 percent by weight of a thermoplastic resin;
(b) from about 15 to about 25 percent by weight of an epoxy-based resin;
(c) from about 2.0 to about 3.0 percent by weight of a curing agent suitable for cross-linking the epoxy-based resin; and
(d) from about 4 to about 10 percent by weight of non-compressible, non-marring microsphere particles, each based on the total weight of the galvanic barrier coating composition;
wherein the galvanic barrier coating is free of crushed or ground glass.