Corrosion inhibitors and coating compositions containing the same

A multi-layer coating comprising:

• (a) a first coating layer applied over at least a portion of a substrate;
• (b) a second coating layer applied over at least a portion of the first coating layer, the second coating layer prepared from a coating composition that is different from (a);
• and
• (c) a third coating layer applied over at least a portion of the second coating layer, the second coating layer prepared from a coating composition that is different from (a),
• wherein the first coating layer is formed from a coating composition comprising:
• (i) a film-forming resin;
• and
• (ii) a corrosion inhibitor comprising (1) an inorganic alkali and/or alkaline earth metal compound and (2) an aldehyde and/or ketone component comprising:
• at least one aromatic ring comprising a ketone and/or aldehyde group and at least one pendant group represented by —OR1, wherein each R1 is independently selected from hydrogen, an alkyl group, or an aryl group.

A method of applying a coating to a surface of a substrate, the method comprising:

• (a) applying a coating composition to at least a portion of a metal surface of a substrate;
• and
• (b) curing the coating composition to form a coating over at least a portion of the surface of the substrate,
• wherein the coating composition comprises:
• (i) a film-forming resin;
• and
• (ii) a corrosion inhibitor comprising (1) an inorganic alkali and/or alkaline earth metal compound and (2) an aldehyde and/or ketone component comprising:
• at least one aromatic ring comprising a ketone and/or aldehyde group and at least one pendant group represented by —OR1, wherein each R1 is independently selected from hydrogen, an alkyl group, or an aryl group.