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).

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.

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 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.