52results about How to "Reliable corrosion resistance" patented technology

A heat exchanger comprising a heat exchange core (1) including a plurality of tubes (2) flowing a medium for heat exchange and a pair of tanks (4) to which ends of said tubes are connected, each tube formed by shaping a plate member (200) not clad with a row laminated brazing material and having a sacrifice layer (210) on an outer surface thereof and a plurality of recessed portions (203) formed on an outer surface of said sacrifice layer and filled with a brazing material (R).

A fuel pipe which is inexpensive and is excellent in salt spray corrosion resistance, characterized by being comprised of a steel pipe member having as a material a ferritic stainless steel which contains, by mass %, C: 0.015% or less, Si: 0.01 to 0.50%, Mn: 0.01 to 0.50%, P: 0.050% or less, S: 0.010% or less, N: 0.015% or less, Al: 0.010 to 0.100%, and Cr: 13.0 to 18.0% and further, one or both of Ti: 0.03 to 0.30% and Nb: 0.03 to 0.30% and a metal fitting part, the metal fitting part and the steel pipe member having between them a crevice structure at the surface which the structure is exposed to a salt spray environment, an opening amount at a crevice part of the crevice structure being 0.2 mm or more, and an inside of the crevice part being coated by electrodeposition.

An automotive member or oil filler pipe includes: a member of ferritic stainless steel containing, in mass %, at most 0.015% of C, at most 0.015% of N, 10.5 to 18.0% of Cr, 0.01 to 0.80% of Si, 0.01 to 0.80% of Mn, at most 0.050% of P, at most 0.010% of S, 0.010 to 0.100% of Al, more than 0.3 to 1.5% of Mo, and one or both of 0.03 to 0.30% of Ti and Nb; and a metal fitting of an aluminized stainless steel sheet, which is attached to the member to define therebetween a gap structure to be exposed to a chloride environment, and has an Al-plating weight per unit area ranging from 20 to 150 g / m2 in the gap structure. Surfaces of the metal fitting and member not facing the gap are coated with a cation electrodeposition coating film having a thickness of 5 to 35 μm.

The invention discloses a high-temperature high-pressure multiphase flow corrosion testing method and a high-temperature high-pressure multiphase flow corrosion testing device. The key points are as follows: under high temperature and high pressure conditions, circular flow of a gaseous-phase corrosive medium and a liquid-phase corrosive medium and thorough contact of the two mediums with the surface of a test sample are kept so that the mechanisms of corrosive actions of factors such as flow velocity, tube ponding, and deposited elemental sulphur can be simulated and researched; and the study on the influencing rules of gaseous-phase, liquid-phase, solid-phase and multiphase flows, suspension and suspended particles on the corrosion actions is also included. The testing method and the device are capable of realizing simulation of various corrosive working conditions: measuring the corrosion resistance of a metal material under various corrosive working conditions and in corrosive environments in high-temperature high pressure gaseous-phase, liquid-phase and multiphase flow states, and measuring the corrosion resistance and the corrosion rate of an oil sleeve in exploitation states such as water-carrying exploitation and water-gathered exploitation. Besides, the corrosion resistance of the metal material is comprehensively evaluated under the multiphase flow high-temperature high-pressure corrosion condition; and the preference of the metal material in a specific corrosive environment is realized according to testing results.

The invention belongs to the field of metal material processing, and particularly relates to a method for enhancing the corrosion resistance of a magnesium alloy material. The method comprises the following steps: S1, material pretreatment: carrying out surface pretreatment and cleaning treatment on a magnesium alloy material to form a mirror surface on the surface of the magnesium alloy material; s2, preparing a surface microstructure through femtosecond laser, wherein a femtosecond laser processing system with the laser wavelength being 800 nm, the pulse width being 104 fs and the frequency being 1 kHz is selected; processing parameters are set according to the material size and a preset processing scheme, different scanning strategies are adopted, and a microstructure composed of periodic grooves and ridges is prepared on the surface of the magnesium alloy material with the laser power not lower than 100 mW; and S3, heat treatment surface modification is conducted, specifically, the magnesium alloy material with the surface microstructure machined in the previous step is subjected to heat treatment for 2-4 h at the temperature of 250-300 DEG C. According to the process method, the problems that a traditional magnesium alloy corrosion-resistant treatment process is large in difficulty and high in machining cost, the strength of a corrosion-resistant structural layer is insufficient, and the environment is prone to being polluted are solved.

A short-flow production method for a carbon steel / stainless steel composite steel wire is characterized by comprising the following technological steps: step 1, using a machinery steel brush to remove dust; step 2, enabling a carbon steel wire subjected to machinery-steel-brush dust removal to firstly pass a box loaded with a binder and to pass through a stainless steel powder box, so as to attach the stainless steel powder to the carbon steel wire; step 3, enabling the carbon steel wire with the adhered stainless steel powder to pass through an ultrahigh-frequency-induction electric impulse heating apparatus for heating; step 4, enabled the heated carbon steel wire with the adhered stainless steel powder to pass through a mold drawing apparatus with a micro compression ratio for drawing, and then performing cooling processing by arranging a cooling apparatus, so as to form the carbon steel / stainless steel composite steel wire; and step 5, taking up the combined carbon steel / stainless steel composite steel wire by using a take-up apparatus. The composite steel wire prepared by employing the method is smooth, bright, clean and mark-free in the surface, and the stainless steel outer layer is uniform, high in adhesive force, durable in corrosion resistance and good in toughness and elasticity.

The invention relates to a light partition board and a preparation method thereof and belongs to the field of building materials. The light partition board is composed of a panel and a core plate, wherein the panel is formed by pouring raw materials comprising cement, slag and coal ash; and the core plate is a flame-retardant plate which is poured in the panel as an interlayer. According to the light partition board and the preparation method provided by the invention, the fireproof flame-retardant plate is used as the core plate, so that the fireproof insulating property of the light partition board can be greatly improved. Moreover, original gridding cloth is replaced by a galvanized steel wire net, and the galvanized steel wire is better in adhesive force, corrosion resistance, toughness and elasticity than those of the griding cloth, so that a wall body is unlikely to crack and deform and is greater in strength. Original plastic clips are also replaced by reinforcing steel bar clips, and can be recycled, and moreover, the clip parts can be poured to enhance the strength of the wall material at the clip parts, so that the integral strength is improved.

The invention discloses a manufacturing method of cationic room-temperature crosslinking water-based vinylidene chloride metal anti-corrosion paint, which is characterized in that resin of the paint is cationic vinylidene chloride latex; an cationic emulsifier is polymerized with high pressure emulsions of a vinylidene chloride monomer and an acrylate monomer; an initiator is mixed by an oil-soluble initiator and a water-based initiator; the prepared vinylidene chloride latex is good in mechanical stability, and can be grinded together with a rust-resistant pigment; the cationic durability is good; cations dissociated from the rust-resistant pigment do not influence the storage stability of the water-based paint; and the anti-corrosion effect is excellent.

A method for manufacturing a heat exchanger includes: assembling a plurality of heat exchanger components in an assembly step; and forming a film on surfaces of the heat exchanger components using a chemical vapor deposition method in a film formation step after the assembly step. The film can restrict a formation of a through hole due to corrosion. The film can be restricted from being damaged at a delivery or assembling time, because the film formation step is provided after the assembly step. An occurrence of clogging can be restricted at a minute portion inside of the heat exchanger in the film formation step, because the film is formed using the chemical vapor deposition method.

An automotive member or oil filler pipe includes: a member of ferritic stainless steel containing, in mass %, at most 0.015% of C, at most 0.015% of N, 10.5 to 18.0% of Cr, 0.01 to 0.80% of Si, 0.01 to 0.80% of Mn, at most 0.050% of P, at most 0.010% of S, 0.010 to 0.100% of Al, more than 0.3 to 1.5% of Mo, and one or both of 0.03 to 0.30% of Ti and Nb; and a metal fitting of an aluminized stainless steel sheet, which is attached to the member to define therebetween a gap structure to be exposed to a chloride environment, and has an Al-plating weight per unit area ranging from 20 to 150 g / m2 in the gap structure. Surfaces of the metal fitting and member not facing the gap are coated with a cation electrodeposition coating film having a thickness of 5 to 35 μm.