A highly durable spring of the present invention includes a single-layer coating film with a thickness of 450 m or less, in which the coating film contains an epoxy resin, a phenolic resin, and zinc. The coating film has high corrosion resistance and chipping resistance even if it is a one thin layer with a thickness of 450 m or less. A method of coating a highly durable spring of the present invention includes an application process in which an epoxy resin-based powder coating material which contains an epoxy resin, a phenolic resin, and zinc and is produced by a melt kneading method is applied to a surface of a spring on which a coating-film is formed and a baking process in which the applied epoxy resin-based powder coating material is baked.

The present invention is directed towards curable film-forming coating compositions comprising metal particles; an alkaline earth metal compound comprising an alkaline earth metal oxide, an alkaline earth metal carbonate, an alkaline earth metal hydroxide, an alkaline earth metal sulfate, an alkaline earth metal monocarboxylate, an alkaline earth metal phosphate, or combinations thereof; and an organic film-forming binder. Also disclosed are methods of making curable film-forming coating compositions, methods of coating substrates, and coated substrates resulting therefrom.

The present invention relates to a two-coat coating system comprising an undercoat coating composition and a topcoat coating composition, wherein the undercoat coating composition is a powder coating composition that comprises a bisphenol A type epoxy resin, an epoxy toughening agent, a hardener, and a foaming agent, and does not contain zinc, and the topcoat coating composition is a powder coating composition that comprises a bisphenol A type epoxy resin, an epoxy toughening agent, a hardener, a foaming agent, and an extender pigment having an average particle size of 10 m or more, and the two-coat coating system exhibits excellent corrosion resistance, impact resistance, chipping resistance, hardness, thick-coated film pinhole stability, and coating efficiency.

The present invention is directed towards curable film-forming compositions comprising metal particles; an alkaline earth metal compound comprising an alkaline earth metal oxide, an alkaline earth metal carbonate, an alkaline earth metal hydroxide, an alkaline earth metal sulfate, an alkaline earth metal monocarboxylate, an alkaline earth metal phosphate, or combinations thereof; and an organic film-forming binder. Also disclosed are methods of making curable film-forming compositions, methods of coating substrates, and coated substrates resulting therefrom.

Provided herein are powder formulations for a primer coat and a topcoat, and methods of applying the powder formulations to at least a portion of a surface of a substrate. Such methods can include applying a powder formulation to a substrate for a topcoat alone or in combination with a primer coat, and then heating the substrate, thereby forming a cured coating on at least the portion of the surface of the substrate. Such heating can be conducted in a single cure step to provide the cured coating including a cured topcoat alone or in combination with a cured primer coat.

The present disclosure relates to agents, compositions, and methods for inhibiting corrosion in various substrates, for example in metal substrates. The present disclosure also relates to compositions for inhibiting corrosion comprising at least one organic heterocyclic compound and at least one metal salt or mixed metal salt selected from rare earth, alkali earth and transition metals.

Provided herein are powder formulations for a primer coat and a topcoat, and methods of applying the powder formulations to at least a portion of a surface of a substrate. Such methods can include applying a powder formulation to a substrate for a topcoat alone or in combination with a primer coat, and then heating the substrate, thereby forming a cured coating on at least the portion of the surface of the substrate. Such heating can be conducted in a single cure step to provide the cured coating including a cured topcoat alone or in combination with a cured primer coat.

A method to synthesize a silver nanohybrid material. The method includes mixing a nitrate solution with a citrate solution to form silver nanoparticles (AgNPs). The method further includes esterifying a first mixture including octadecanoic acid, octadec-9-enoic acid, and octadeca-9,12-dienoic acid with caffeic acid in the presence of an acid catalyst and a solvent to form an unsaturated carboxylic acid mixture including first, second, and third acrylic acid derivatives. The method includes reacting the unsaturated carboxylic acid mixture with ethylene glycol to form a second mixture including first, second, and third ester derivatives. The method further includes mixing the AgNPs with the second mixture to form a third mixture. The method includes evaporating water from the third mixture to form the silver nanohybrid material. The silver nanohybrid material includes a AgNP core covered with the first, second, and third ester derivatives bonded to the AgNP core.

A method to synthesize a silver nanohybrid material. The method includes mixing a nitrate solution with a citrate solution to form silver nanoparticles (AgNPs). The method further includes esterifying a first mixture including octadecanoic acid, octadec-9-enoic acid, and octadeca-9,12-dienoic acid with caffeic acid in the presence of an acid catalyst and a solvent to form an unsaturated carboxylic acid mixture including first, second, and third acrylic acid derivatives. The method includes reacting the unsaturated carboxylic acid mixture with ethylene glycol to form a second mixture including first, second, and third ester derivatives. The method further includes mixing the AgNPs with the second mixture to form a third mixture. The method includes evaporating water from the third mixture to form the silver nanohybrid material. The silver nanohybrid material includes a AgNP core covered with the first, second, and third ester derivatives bonded to the AgNP core.

Provided is a primer composition capable of curbing bubbling in a multilayer body in the case of being used to form a primer layer in the multilayer body. A primer composition for rotolining containing a powder or pellet of a perfluoropolymer and at least one predetermined powder selected from the group consisting of an amine antioxidant having a molecular weight of 1,000 or less and an organic sulfur-containing compound having a molecular weight of 1,000 or less.