Compositions and coatings with non-chrome corrosion inhibitor particles

A method of preparing a non-chrome corrosion inhibitor coating composition comprising a disulfide/dithiol compound, the method comprising:

• forming a 1% by weight mixture comprising a suspension of 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) in water;
• agitating the mixture to form a plurality of nano-sized particles comprising the 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione);
• introducing the plurality of the nano-sized particles comprising the 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione) into a fluidizer;
• spraying a water-permeable protectant forming composition comprising a material chosen from epoxy and poly (meth) acrylates onto a surface of the plurality of nano-sized particles to form a water-permeable protectant on the surface of the plurality of nano-sized particles by covalently bonding at least one of a reactive component of the protectant-forming composition to a thiol group of the 5,5-dithiobis-(1,3,4-thiadiazole-2(3H)-thione);
• and
• incorporating the nano-sized particles comprising the water-permeable protectant into a coating composition;
• wherein the nano-sized particles comprise a particle size of from about 100 nm to about 1 micron.