Corrosion and chip-resistant coatings for high tensile steel components, such as automotive coil springs, can be formed from a coating composition comprising a primer having an epoxy resin with the proviso that the epoxy resin does not have an EEW of about 860 to about 930, a polyhydroxyl functional phenolic curing agent having a HEW of about 200 to about 500, and a platy filler. The primer contains less than 20 wt % zinc. The topcoat includes an epoxy resin having an epoxy equivalent weight of about 450 to about 1400, an elastomer-modified epoxy resin having an epoxy equivalent weight of about 1000 to about 1600, a foaming agent and a reinforcing fiber.

A powder coating composition is provided herein. The powder coating composition includes a glycidyl-functionalized (meth)acrylic resin as a film-forming binder, a cross-linking agent (hardener) for the binder, particles chosen from the group comprising aluminum oxide Al.sub.2O.sub.3 and aluminum hydroxide Al(OH).sub.3 particles, and a coating additive, the wt % based on the total weight of the powder coating composition. A process for the production of a scratch resistant powder coating is also provided herein. The process includes the steps of a) applying a transparent clear coat or a pigmented top coat directly onto a substrate surface or onto a prior coating, and b) curing the clear coat or the top coat applied in step a) wherein the transparent clear coat or the pigmented top coat includes the powder coating composition.

The composition described herein for the prevention of corrosion comprises: sacrificial metal particles more noble than a metal substrate to which the composition contacts; carbonaceous material that can form electrical contact between the sacrificial metal particles; and means for providing an anticorrosion coating material for the metal substrate. The composition can form a coating on a metal substrate surface. A method for applying the composition for the prevention of corrosion is also described herein.

The present disclosure is directed to the agents, compositions, and methods for inhibiting corrosion in various substrates, for example in metal substrates. The compositions for inhibiting corrosion comprise 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.

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.

A curable coating composition includes: (a) a binder having a film-forming resin with at least two functional groups, and (ii) a curing agent reactive with the functional groups of the film-forming resin; and (b) solid vulcanized rubber particles that are unreactive with the binder. The curable coating composition is a solid particulate powder coating composition. Multi-layer coating systems and methods of preparing the curable coating composition are also included.

Disclosed herein are methods and formulations for the microencapsulation of aminosiloxanes, for example for use as an additive in protective material formulations such as those used in the protection and/or joining of metal substrates. The additives may be used in conjunction with a second reactant that may or may not be similarly microencapsulated for self-healing (and associated corrosion resistance) or delayed cure applications, or they may be used alone or in conjunction with other corrosion inhibitors for protective formulations with improved corrosion resistance on appropriate substrates.

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 application is directed to chromium-free anticorrosive coating composition and article made therefrom. The chromium-free anticorrosive coating composition comprises Component A, comprising a film-forming composition, a corrosion inhibiting composition, optional carriers and additional additives, wherein the corrosion inhibiting composition comprises anti-rust particles containing at least one phosphate compound of lithium and having a lithium content of at least 1.0% by weight; and optionally Component B, comprising a curing agent. The chromium-free anticorrosive coating composition according to the present application may be used as a primer or a direct-to-metal coating. The present application further discloses an article, comprising a metal substrate; and a coating formed of the above chromium-free anticorrosive coating composition which is directly applied to the metal substrate.

A curable coating composition includes: (a) a binder having a film-forming resin with at least two functional groups, and (ii) a curing agent reactive with the functional groups of the film-forming resin; and (b) solid vulcanized rubber particles that are unreactive with the binder. The curable coating composition is a solid particulate powder coating composition. Multi-layer coating systems, coated substrates, and methods of preparing the curable coating composition are also disclosed.