摘要:
Disclosed herein are systems and methods for treating a metal substrate. The system includes a first pretreatment composition comprising a fluorometallic acid and free fluoride and having a pH of 1.0 to 4.0 and a second pretreatment composition comprising a Group IVB metal or a third pretreatment comprising a lanthanide series metal and an oxidizing agent. The method includes contacting at least a portion of a surface of the substrate with the first pretreatment composition and optionally contacting at least a portion of the substrate surface with the second pretreatment composition or the third pretreatment composition. Also disclosed are substrates treated with one of the systems or methods. Also disclosed are magnesium or magnesium alloy substrates comprising a bilayer comprising a first layer comprising silicone and a second layer comprising fluoride.
摘要:
A gearbox adapted for use with a gas turbine engine and a method for making the same are disclosed herein. The gearbox comprising a housing made from a magnesium alloy, and an aluminum oxide coating on the magnesium alloy housing. The aluminum oxide coating may inhibit corrosion of the housing, and may have a nano-microcrystalline structure that defines an inner region bonded directly to the housing and an outer region spaced apart from the housing.
摘要:
A coating composition for a food or beverage can that includes an emulsion polymerized latex polymer formed by combining an ethylenically unsaturated monomer component with an aqueous dispersion of a water-dispersible polymer.
摘要:
Reactive nanocomposites comprising a metal nanoparticle functionalized with one or more layers of self-assembled protein cages and methods of making the same. The reactive nanocomposites according to the present invention demonstrate improved reaction kinetics and enhanced exothermic behavior.
摘要:
A method is disclosed for making a lithium-ion electrochemical cell comprising elements of the lithium-ion electrochemical cell contained within an aluminum alloy or magnesium alloy single-cell container. External surfaces of the container are coated for resistance to water-based corrosion. Rolled or folded layers of anode, cathode, and separator elements of the lithium-ion cell are placed in the aluminum or magnesium alloy container. And, with the placed elements of the lithium-ion cell in the container, and during one or more following steps of a manufacturing assembly process of the lithium-ion cell, an atmospheric pressure plasma stream, initially comprising hexamethyldisiloxane, is applied to external surfaces of the aluminum alloy or magnesium alloy container to form a silicone polymer coating on the surfaces that protects the container from water-based corrosion. The method is useful in forming batteries for automotive vehicles exposed to salt water environments.
摘要:
Bondable fluorinated barrier coatings on oxidized metal surfaces. The barrier coatings include a perfluorinated silane having a C2-C30 alkyl chain with a reactive silicon end containing 1 to 3 leaving groups. The perfluorinated silane layer is covalently bonded to an underlying oxide layer and the outer surface is treated with an atmospheric-pressure plasma treatment. The resultant barrier coating exhibits corrosion resistance attributed to perfluorinated silanes but with enhanced bonding/adhesion properties.
摘要:
Chemically and mechanically protective oxide film was formed on Mg alloys using micro-arc oxidation (MAO) methods. Further modification of the obtained MAO surfaces was made in various aspects and the processes thereof were described. Firstly, the protection is enhanced by forming super-hydrophobic surfaces, with water contact angle higher than 140°, attributed to hierarchical nano-micro structures. Secondly, the electrical property of the MAO surfaces is modified. A film with sheet resistance as low as 0.05 Ω/sq is achieved by electro-less Ni deposition on MAO surfaces. Thirdly, black colors are achieved by the sol-gel process on MAO samples.
摘要:
A coating composition for a food or beverage can that includes an emulsion polymerized latex polymer formed by combining an ethylenically unsaturated monomer component with an aqueous dispersion of a water-dispersible polymer.
摘要:
A coating composition for a food or beverage can that includes an emulsion polymerized latex polymer formed by combining an ethylenically unsaturated monomer component with an aqueous dispersion of a salt of an acid- or anhydride-functional polymer and an amine, preferably, a tertiary amine.
摘要:
The invention relates to a process for the coating of objects made of valve metals selected from aluminum, magnesium, titanium, niobium and/or zirconium and their alloys with an oxide ceramic layer formed from the metal which has a thin barrier layer as a boundary layer towards the metal whose surface has been coated with polymers, characterized in that said polymers are introduced into the capillary system of the oxide ceramic layer in the form of dimers or halogenated dimers of general formula I wherein R1 represents one or more hydrogen or halogen residues; each R2 represents hydrogen or halogen; and R3 commonly represent a corresponding xylylene residue for completing a dimeric structure; by vacuum coating, followed by polymerizing the dimers.