Disclosed is an antifreezing coolant composition, which does not include glycol but includes environmentally friendly materials, such as a carboxylic acid salt, an anthranilamide compound, a corrosion inhibitor and a triazole compound. The antifreezing coolant composition may form a thin film on the metal surface in cooling systems for vehicles to thereby exhibit high corrosion resistance at low and high temperatures, superior antifreezing performance at low temperatures, and superior cooling performance at high temperatures.

Corrosion inhibitor compositions are provided that can include a mixture of one or more alkaline earth metals, one or more organic phosphates, one or more inorganic phosphates, optionally a dispersant, and hydroxyphosphono acetic acid and/or salts thereof and/or derivatives of hydroxyphosphono acetic acid and/or salts thereof. Methods of mitigating or inhibiting corrosion of metal surfaces are also disclosed. The methods can include the steps of adding a corrosion inhibitor composition as described in the present disclosure to a medium in contact with the metal surface and optionally to the metal surface before it is contacted by the medium.

A grain-oriented electrical steel sheet has a steel sheet and an insulating coating which is formed on a surface of the steel sheet. In the insulating coating, a metal phosphate and a colloidal silica are contained, the colloidal silica is contained in an amount of 20 to 150 parts by mass with respect to 100 parts by mass of the metal phosphate, one or more kinds of fine particles selected from the group consisting of silicon carbide, silicon nitride, aluminum nitride, boron nitride, sialon, and cordierite are further contained in an amount of 0.5 to 7 parts by mass with respect to 100 parts by mass of the metal phosphate, an average particle size of the fine particles is 0.3 to 7.0 μm, crystallized ratio of the metal phosphate is 2% to 40%, and chromium is not contained.

Methods and compositions for inhibiting corrosion of a corrodible metal surface that contact a nitrogen-containing solution. The method comprises adding a chemical treatment composition to the nitrogen-containing solution that includes an organic filmer and a passivator. The organic filmer may be a hydroxycarboxylic acid. The chemical treatment composition may further include a surface-active compound.

A galvanized steel sheet is covered with an organic resin containing an anticorrosive additive that reduces galvanic current flowing between the zinc coating and the base steel sheet, to thereby considerably suppress intrusion of hydrogen into the steel sheet to prevent delayed fracture of the steel sheet.

Disclosed are methods of using nitrogen-containing compounds as corrosion inhibitors. The present method is used to inhibit corrosion of a metal surface in contact with an aqueous system using 2-substituted imidazoles and 2-substituted benzimidazoles, and provides enhanced protection against corrosion of metals in the aqueous system. The method comprises the use of corrosion inhibitors that are generally resistant to halogen attack and provide good corrosion resistance in the presence of oxidizing halogen-based biocides. Formulations comprising 2-substituted imidazoles and 2-substituted benzimidazoles are also disclosed.

A composition with corrosion inhibiting properties is provided that includes a first phosphate salt of at least one of trimetaphosphate, hexametaphosphate, or tripolyphosphate. A second phosphate salt of at least one of a disodium phosphate and tetrasodium pyrophosphate is also present with the first phosphate salt present in a weight ratio relative to the second phosphate salt of from 1-4:1. Upon dissolution from 0.1 to 5 total weight percent in a solvent a corrosion inhibiting solution results that is well suited for usage as a water conditioner in cooling systems. A process of protecting an iron containing metal from corrosion is also provided that includes exposing the metal to the solution. The corrosion of the metal over time is monitored to assure the protection of the metal.

A super concentrate additive solution is disclosed herein. A super concentrate additive solution can be added into a heat transfer fluid to improve corrosion protection performance and to extend the service life of a heat transfer system or the fluids therein. A method includes adding a super concentrate additive solution to a heat transfer fluid to form a super additive heat transfer fluid and adding the mixture to a heat transfer system. A super concentrate additive solution can also be used in flexible production of a high corrosion protection performance heat transfer fluid concentrate, pre-diluted heat transfer fluids, or ready-for-use heat transfer fluids.

Corrosion inhibitor compositions are provided that can include a mixture of one or more alkaline earth metals, one or more organic phosphates, one or more inorganic phosphates, optionally a dispersant, and hydroxyphosphono acetic acid and/or salts thereof and/or derivatives of hydroxyphosphono acetic acid and/or salts thereof. Methods of mitigating or inhibiting corrosion of metal surfaces are also disclosed. The methods can include the steps of adding a corrosion inhibitor composition as described in the present disclosure to a medium in contact with the metal surface and optionally to the metal surface before it is contacted by the medium.

Methods and compositions for inhibiting corrosion of a corrodible metal surface that contact a nitrogen-containing solution. The method comprises adding a chemical treatment composition to the nitrogen-containing solution that includes an organic filmer and a passivator. The organic filmer may be a hydroxycarboxylic acid. The chemical treatment composition may further include a surface-active compound.