305 results about "Galvanic corrosion" patented technology

A method of assembling and installing a vertical cable infill deck railing system is disclosed in which cables are strung two parallel rails, pulled taut, and tightened into position. The cable railing system resists galvanic corrosion by using a flange nut cap to separate dissimilar metals. The flange nut cap also prevents the associated flange nut from falling if it is overly loosened. Galling is reduced without the need for additional coatings by using a phosphor bronze threaded crimp.

The invention relates to the field of medical instruments, in particular to a heart valve. The invention provides a heart valve. The heart valve comprises a stent body, a skirt edge and developing points. The skirt edge is connected to the bracket body; the skirt edge comprises an inner skirt edge and an outer skirt edge; the inner skirt edge and the outer skirt edge form an interlayer; the developing points are arranged in the interlayer; the number of the developing points is at least two; at least two developing points are in the same or different annular cross sections. Developing points are arranged in an interlayer; the setting mode can physically isolate the developing point, and the direct contact between the bracket and the developing point is eliminated through physical isolation; the galvanic corrosion risk can be effectively avoided, and the service life of instruments is prolonged; the metal ion release risk is reduced, and the biological safety is improved. And the developing points are arranged in the interlayer between the inner skirt edge and the outer skirt edge, so that the overall position of the valve can be reflected more accurately.

The invention discloses a high-corrosion-resistance magnesium alloy and a preparation method and application thereof, and belongs to the technical field of magnesium alloys, the high-corrosion-resistance magnesium alloy is based on multi-element rare earth microalloying and dispersed Mg17Al12 phase synergistic regulation, in the high-corrosion-resistance magnesium alloy, a fine dispersed Mg17Al12 second phase is evenly distributed in a whole magnesium matrix, and the high-corrosion-resistance magnesium alloy has the advantages that the high-corrosion-resistance magnesium alloy is obtained; the magnesium alloy has the beneficial effects that the magnesium alloy is good in corrosion resistance, uniform corrosion of a magnesium matrix is promoted, and the micro-galvanic corrosion effect between the Mg17Al12 phase and the magnesium matrix is greatly weakened, so that serious local corrosion of the magnesium alloy in a traditional AZ91 alloy is converted into a uniform corrosion behavior, and the corrosion resistance of the magnesium alloy is greatly improved.

Provided is a downhole tool, a well system, and a method. The downhole tool, in one aspect, includes an expandable metal member positioned about a structure, the expandable metal member comprising a metal configured to expand in response to hydrolysis. The downhole tool, in accordance with this embodiment, further includes a dissimilar cathodic electric conductor isolated within the expandable metal member, the dissimilar cathodic electric conductor configured to initiate a galvanic corrosion effect to increase an expansion rate of the expandable metal member when a reactive fluid comes into contact with the dissimilar cathodic electric conductor and the expandable metal member.

The invention discloses a material tensile strength testing device suitable for a high-humidity and high-salt environment, the material tensile strength testing device comprises a box body, two connecting plates are fixedly connected to the rear side, close to the top, of an inner cavity of the box body, the two connecting plates are arranged in a bilateral symmetry mode, and two concentric-square-shaped frames are jointly and fixedly connected between the two connecting plates; through mutual cooperation of a driving gear, a concave mounting plate, an A-shaped mounting plate, a driving motor, a cleaning gear, an inner gear ring and the like, the outer surface of a reinforcing steel bar can be pretreated, and the situation that a test result is affected by corrosion of the surface of the reinforcing steel bar is prevented; through mutual cooperation of a component moving motor, a connecting plate, a double-thread lead screw, a moving block, a salt spray test box, a linkage rod, absorption cotton and other components, when a steel bar is tested in a continuous salt spray environment, salt spray liquid drops are attached to the outer surface of the steel bar, so that the surface of a sample is condensed; a local electrolyte membrane can be prevented from being formed on the surface of the steel bar to accelerate pitting corrosion or galvanic corrosion.

The embodiment of the invention provides a middle frame and electronic equipment, the middle frame comprises a middle frame body and a barrier, the middle frame body is made of a metal material, and the middle frame body is provided with a mounting port communicated with the outside. The mounting port is configured to mount a metal functional member of the electronic device, and the inner wall of the mounting port faces the metal functional member. The blocking piece is arranged on at least part of the inner wall of the installation opening and used for separating the middle frame body from the metal function piece. The risk of galvanic corrosion of the middle frame provided by the embodiment of the invention is relatively low.

The invention relates to the technical field of surface treatment of mechanical parts, in particular to a self-lubricating anti-corrosion wear-resistant coating and a preparation method thereof.A transition layer is arranged between a coating substrate and a DLC layer, the transition layer contains Cr-O-W-C components, and a bottom layer, a middle layer and a surface layer are a crystal layer, a crystal-amorphous alternating layer and an amorphous layer respectively; the transition layer gradually relieves thermal / mechanical stress through collaborative optimization gradient design of components, structures and interlamellar spacing, the stripping resistance and corrosion resistance of the coating are remarkably improved, the service life of the coating is remarkably prolonged, collaborative improvement of corrosion resistance, wear resistance, self-lubricating performance and the like of the coating is further achieved, and the service life of the coating is prolonged. And finally, the double-gradient composite coating is constructed, so that the internal stress between the surface layer and the bottom layer can be relieved, long-acting corrosion prevention and a strong supporting effect on the diamond-like surface layer can be provided, the risk that the diamond-like surface layer falls off in the long-acting service process due to galvanic corrosion is relieved, the service life of parts is prolonged, and the equipment safety is improved.

The invention discloses a micro-arc oxidation coating on the surface of a magnesium / aluminum or magnesium / aluminum alloy composite material as well as a preparation method and application of the micro-arc oxidation coating. Belongs to the technical field of metal surface micro-arc oxidation corrosion prevention, and is a micro-arc oxidation coating formed by carrying out low-voltage passivation and high-voltage growth multi-step micro-arc oxidation treatment on the surface of a magnesium / aluminum or magnesium / aluminum alloy composite material. According to the method, the passivation layer which is relatively thin but relatively compact is prepared at low voltage, so that the metal surface activity is reduced, and the oxide film layer is prevented from being ablated and broken under subsequent high-voltage treatment; according to different response conditions of different metals to the same voltage and the growth characteristics of the micro-arc oxidation coating, the coatings on different metal sides can grow to 100 microns in a low-voltage and high-voltage combined treatment mode. The problems that the damaged part of the magnesium alloy is repaired by using aluminum and an alloy thereof, galvanic corrosion occurs in a magnesium / aluminum composite board and a magnesium / aluminum composite component in the service process, the properties of a low-voltage film layer of a composite metal material are uneven, and a high-voltage film layer is ablated and damaged are solved.

The purpose of one aspect of the present disclosure is to provide a connector capable of suppressing galvanic corrosion between terminals. This connector is provided with: a plate-shaped first terminal (21) having a mounting hole (27); a second terminal (51); a relay terminal (30) provided between the first terminal and the second terminal; and a bolt member (40) for fastening and fixing the first terminal, the second terminal, and the relay terminal. The first terminal (21) and the second terminal (51) are formed of different metals from each other. The relay terminal (30) is formed of a metal having an ionization tendency that is intermediate between the first terminal (21) and the second terminal (51). The first terminal (21) has an oxide film on the surface of the first terminal (21) including the inner peripheral surface of the mounting hole (27). The relay terminal (30) has a press-fit fixing part (32) that is press-fitted and fixed to the mounting hole (27). The press-fit fixing part (32) has: an insertion part (34) that is inserted into the mounting hole (27); and a protruding part (35) that protrudes from the outer peripheral surface of the insertion part and scrapes the oxide film on the inner peripheral surface of the mounting hole.

A heavy-duty surface mount post system includes a post base with a mounting member and a post designed to slide over the tube. Shims are mounted between the mounting member and the post to create a tighter fit and to resist galvanic corrosion when the base and post are made of different materials, such as steel and aluminum. Optional decorative skirts provide additional stability and aesthetic appeal. The system is ideal for fencing installations on concrete or other solid surfaces, accommodating a range of tolerances while simplifying assembly.

The invention provides a method for regulating and controlling degradation performance of a degradable implantable interventional medical device through structural design. The method comprises the following steps: extracting key design parameters of the degradable implantable interventional medical device based on an axiom design method; the method comprises the following steps: establishing a corrosion model based on a finite element method, simulating a continuous medium mechanics-based corrosion model and an elementary corrosion model of various corrosion mechanisms such as uniform galvanic corrosion, pitting corrosion, stress corrosion, fatigue corrosion and the like, and quantitatively calculating degradation kinetic parameters such as degradation rate, period, uniformity and the like of different structures under physiological conditions; in combination with clinical requirements on degradation performance, a structure optimization method is used, key design parameters are used as optimization geometric parameters, clinical degradation performance requirements are used as optimization targets, and the degradation performance of the implantable interventional medical device is regulated and controlled through the structure optimization method. The method can effectively solve the problem that the degradation performance of the existing degradable implantable interventional medical device is uncontrollable, the degradation uniformity is improved, and the curative effect of the degradable implantable interventional medical device is improved.

The present invention discloses a probe device and method for testing the high-temperature corrosion resistance of the metal material of the heating surface of a waste incineration boiler, which can be used to conduct an online high-temperature corrosion simulation test of the heating surface in the furnace of a waste incineration power plant. The present invention realizes the controllability of the temperature of the test piece through the gas reflux design of the inner and outer sleeves and the independently sealed internal space. In order to avoid the influence of galvanic corrosion caused by direct contact of different metals due to connection methods such as welding or threads on the experimental results, the present invention adopts a split tightening clamp flange as a connecting component connecting the test piece and the main body of the device, and fills a high-temperature resistant rubber gasket between the flange and the test piece as a barrier layer. This also ensures the good sealing of the device and realizes the convenient disassembly and assembly of the test piece. The present invention has a simple design, is easy to carry, and has a wide range of uses. It can realize the test of the high-temperature corrosion resistance of different metal materials in waste incineration power plants, and is suitable for on-site research on high-temperature corrosion of boiler heating surfaces.

Provided is a downhole tool, a well system, and a method. The downhole tool, in one aspect, includes an expandable metal member positioned about a structure, the expandable metal member comprising a metal configured to expand in response to hydrolysis. The downhole tool, in accordance with this embodiment, further includes a dissimilar cathodic electric conductor isolated within the expandable metal member, the dissimilar cathodic electric conductor configured to initiate a galvanic corrosion effect to increase an expansion rate of the expandable metal member when a reactive fluid comes into contact with the dissimilar cathodic electric conductor and the expandable metal member.

The invention discloses a battery connecting piece and a preparation method thereof, the battery connecting piece comprises a conductive layer and a heat dissipation layer, the conductive layer is arranged at the bottom of the heat dissipation layer, an insulating layer is arranged between the conductive layer and the heat dissipation layer, and the conductive layer and the heat dissipation layer are bonded together through the insulating layer to form the battery connecting piece of a composite structure. A protective layer is integrally formed at the bottom of the conductive layer, a main channel is formed in the heat dissipation layer in the long edge direction, and a plurality of branch channels are formed in the two sides of the main channel in a communicating mode. According to the battery connecting piece provided by the invention, the conductive layer, the heat dissipation layer and the insulating layer are combined to form the battery connecting piece of a composite mechanism, thermoelectric separation of the battery connecting piece is realized through insulativity and thermal conductivity of the insulating layer, temperature stability of the conductive layer is ensured through isolated heat dissipation, resistance fluctuation of the conductive layer is further reduced, and the service life of the battery connecting piece is prolonged. And meanwhile, the insulating layer blocks a galvanic corrosion path, so that the service life of the battery connecting piece is effectively prolonged.

The invention relates to a low-cost high-strength corrosion-resistant magnesium alloy and a preparation method thereof. The magnesium alloy comprises the following components in percentage by mass: 6-11% of Al, 0.4-0.6% of Zn, 0.2-0.6% of Mn, 0.2-0.4% of Y, 0.2-0.6% of Ca and the balance of Mg and inevitable impurities. A small amount of Ca and Y elements are added, on one hand, an alpha-Mg matrix structure can be refined, beta phase distribution is more uniform, and the mechanical property is improved; and on the other hand, the solid solubility of the alloy element Y in an alpha-Mg matrix can be improved by adding the Ca element, the compactness of a surface oxidation film and a corrosion product film is promoted, compared with other rare earth elements, the potential difference between Al-Ca and Al-Y phases formed by Ca, Y and Al and the magnesium matrix is smaller, micro galvanic corrosion is smaller, and the corrosion resistance of the alloy is remarkably improved.

The invention relates to the technical field of fine chemical engineering, and discloses a fuel cell cooling liquid and a preparation method thereof, and the preparation method comprises the following steps: preparation of a basic liquid, construction of a corrosion inhibition system, ion inhibition treatment, addition of a functional auxiliary agent and post-treatment. According to the composite corrosion inhibitor, zinc ions are anchored to gap sites of a silicate framework through the surface loading effect of sodium silicate and nano-zinc oxide under the shear dispersion condition, a compact composite passivation film is formed on the surface of a metal pipeline, and an electrode potential active area is covered; meanwhile, molybdate ions are subjected to a self-repairing reaction at the defect position of a passivation film preferentially by virtue of the oxidation-reduction characteristic of the molybdate ions, and formation of a galvanic corrosion microbattery is blocked by dynamically filling microcracks, so that the integrity of a corrosion inhibition system is improved; all the components of the composite corrosion inhibitor generate a synergistic effect in a specific proportion, so that the cooling liquid can maintain stable corrosion resistance for a long time.

The invention provides a high-strength plastic super-corrosion-resistant magnesium alloy and a preparation method thereof. The magnesium alloy comprises, by mass, 2%-6% of aluminum, 0.5%-3% of tin, 0.4%-2% of calcium, 0.1%-0.5% of manganese and 0.05%-0.4% of rare earth, the rare earth is one or any combination of yttrium, cerium or samarium, the yttrium is 0.05%-0.4%, the cerium is 0.05%-0.4%, the samarium is 0.05%-0.4%, and the balance magnesium. The content of inevitable impurities is less than or equal to 0.02%. The preparation method of the magnesium alloy comprises the four steps of dip angle cast rolling, stepped solid solution, multi-pass rolling and annealing. According to the method, the process is simplified, the preparation time is effectively shortened, micro-galvanic corrosion between the matrix and the second phase is slowed down, the sizes of the second phase and grains are further reduced, and the corrosion resistance and the strong plasticity of the magnesium alloy are remarkably improved.

The invention relates to the technical field of corrosion simulation, and particularly provides a galvanic corrosion simulation method and system for a dissimilar metal lap joint structure of an airplane, and the method comprises the steps: constructing a Heaviside function for representing boundary discontinuity based on a defined domain and boundary; converting the Heaviside function into a basic function which introduces a first-order fuzzy approximation interface, and constructing an interface description model based on the basic function; constructing a level set mechanism model based on the interface description model and a level set basic function; and setting the particle concentration in the electrolyte domain to be the same, and solving the horizontal mechanism model to obtain the dynamic change of the corrosion interface. According to the method, the Heaviside function and the level set mechanism are combined, the Nernst-Planck equation is combined, the level set mechanism model is constructed, corrosion dynamic interface evolution simulation is achieved, and the goodness of fit with the real galvanic corrosion process of the airplane dissimilar metal lap joint structure is higher.

The invention belongs to the technical field of magnesium alloy corrosion prevention, and particularly relates to a galvanic corrosion protection method and a galvanic corrosion prevention magnesium-containing connecting assembly, the galvanic corrosion protection method and the galvanic corrosion prevention magnesium-containing connecting assembly are applied to galvanic corrosion formed by contact of a magnesium alloy structural part and a dissimilar metal connecting part, and the galvanic corrosion protection method comprises the steps that firstly, chemical conversion film treatment is conducted on the magnesium alloy structural part (1); 2, carrying out first coating anti-corrosion treatment on the dissimilar metal connecting piece (2) and the fastening assembly; 3, coating a structural adhesive (6) on a contact binding surface formed between the magnesium alloy structural part (1) subjected to the chemical conversion film treatment and the dissimilar metal connecting part (2) subjected to the first coating anti-corrosion treatment; and fourthly, the magnesium alloy structural part (1) and the dissimilar metal connecting part (2) with the contact binding face coated with the structural adhesive (6) are locked through the fastening combination part, an assembly part is formed, and second coating anti-corrosion treatment is conducted on the assembly part. By adopting the method, the galvanic corrosion risk is greatly reduced.

The invention relates to the technical field of magnesium alloy surface treatment, in particular to a method for preparing a high-corrosion-resistance golden conductive conversion film on the surface of a ZK61 magnesium alloy, and the two-phase property of Zr and Zn is utilized to dissolve Zr and Zn substances stored on the surface layer in an oxidation state in a high-alkalinity environment so as to achieve the purpose of removing high potential phases. Meanwhile, the Mg element is protected in a high-alkalinity oxidation state environment, then a layer of rare earth conversion film is prepared in an alkaline oxidation environment, then a golden conductive conversion film is prepared, and then drying and detection are performed after sealing, so that the problems that in the production and heat treatment process of the ZK61 magnesium alloy, Zr and Zn segregation phenomena are likely to occur, galvanic corrosion of the ZK61 magnesium alloy is serious, and the service life of the ZK61 magnesium alloy is prolonged are solved. And the corrosion resistance is poor. And therefore, even in the preparation process of the chemical conversion film, the integrity and corrosion resistance of the chemical conversion film are greatly influenced due to severe galvanic corrosion, and the corrosion resistance of the conductive conversion film with lower contact resistance is poorer.

The utility model discloses a bolt, a connecting structure of a magnesium alloy component and an electric drive assembly, and relates to the technical field of automobiles. Or, the bolt comprises a bolt body and a coating layer arranged on the surface of the bolt body, and the coating layer comprises a flame-retardant magnesium alloy coating. When the bolt provided by the utility model is used for connecting a magnesium alloy component and other components made of dissimilar materials, the overall potential difference can be greatly reduced, so that the galvanic corrosion degree is reduced. Therefore, the problem that galvanic corrosion is prone to being generated when the speed reducer shell made of magnesium alloy and the all-in-one machine shell made of aluminum alloy are connected through the steel bolts can be solved.

This invention provides an engine valve and a method for manufacturing the same, which can suppress galvanic corrosion even when dissimilar metals are joined, and which exhibits excellent wear resistance and corrosion resistance, for use in engines that use CNG, LPG, or alcohol as fuel. [Solution] The engine valve 10 of the present invention is a joint member in which a shaft portion 14 made of martensitic heat-resistant steel SUH11 and a umbrella portion 12 made of austenitic heat-resistant steel SUH35 are joined. A nitride layer is formed only on the surface of the base material on the shaft portion 14 side from the joint portion 13 between the shaft portion 14 and the umbrella portion 12, leaving the surface of the base material exposed on the umbrella portion 12 side from the joint portion 13.

The invention aims to provide an insulating composite ceramic coating with high impact resistance and a preparation method of the insulating composite ceramic coating. The coating is based on nano-agglomerated AlO-3 wt.% TiO composite powder; a double-stage atmospheric plasma spraying process is adopted to directly prepare on a stainless steel substrate under the condition that a metal bonding layer is not prepared in advance: in the first stage, a strong bonding bottom layer is formed at relatively high power, and in the second stage, a nano-structure working layer is constructed at optimized power. In addition, a functional additive accounting for 0.5-3% of the total mass of the powder is externally doped to carry out laser remelting treatment on the coating so as to further densify the coating. Through component compounding and process gradient design, the contradiction that high insulativity and high toughness of the coating are difficult to consider at the same time is successfully solved, and the prepared coating has high hardness, high fracture toughness, high bonding strength and excellent impact resistance and insulation performance; and a long-acting and reliable solution is provided for galvanic corrosion protection of dissimilar metal connecting parts in the marine environment.

The application relates to the technical field of electrical connection equipment, and discloses a high-current small bus plug-in box rotary plug, which is used to solve the problems that the structure of key conductive components is single, the setting space is cramped, the conductive temperature rises fast, and the components are prone to aging in the prior art. The application is characterized in that the space of the regular octagonal flame-retardant PC shell and the insulating partition plate is optimized, the T2 oxygen-free copper Z-shaped large-section pin array is symmetrically arranged, the uniform contact pressure guaranteed by the spring assembly is matched, the conductive cross-sectional area is 2-3 times higher than that of the traditional reed structure, the galvanic corrosion of dissimilar metals is effectively avoided, the current-carrying capacity and the current transmission stability are greatly improved, the multidirectional heat exchange channels formed by the regular octagonal included angle, the pin array bending gap and the internal cavity are combined, the separation and heat dissipation of the insulating partition plate are combined, the cold and hot air efficient convection is realized, and the temperature rise of the key components is significantly reduced.

This invention relates to the field of zinc alloy surface modification technology, and particularly to a corrosion-resistant medical zinc alloy, its preparation method, and its applications. The preparation method includes the following steps: weighing raw materials according to the chemical composition of the zinc alloy; cleaning the surface of the raw materials; smelting, refining, and casting to obtain an ingot; subjecting the ingot to equal-channel angular extrusion deformation to obtain an extruded zinc alloy; performing high-energy ion implantation on the zinc alloy to obtain a nitrogen-ion-implanted zinc alloy; and preparing a coating on the surface of the nitrogen-ion-implanted zinc alloy to obtain the final product. This invention achieves a high-adhesion, dense, and uniform deposition effect on the alloy surface through the synergistic control of "equal-channel angular extrusion + high-energy nitrogen ion implantation + biomimetic coating deposition," solving the problem of severe galvanic corrosion at localized sites in existing zinc alloys under corrosive environments. Simultaneously, the dense deposition layer helps inhibit rapid dissolution of the zinc alloy surface, significantly reducing the corrosion rate of the zinc alloy in corrosive environments.

The invention relates to the technical field of vehicles, and discloses a circuit conduction assembly and a vehicle, the circuit conduction assembly is suitable for being electrically connected with a vehicle body conductive part, the vehicle body conductive part comprises a first element, and the standard electrode potential of the first element is E1; comprising a conductive terminal, the conductive terminal comprises a second element, the standard electrode potential of the second element is E2, and E2 is larger than E1; the insulating part is arranged between the vehicle body conductive part and the conductive terminal in an insulating manner so as to prevent direct contact between the vehicle body conductive part and the conductive terminal; and the conduction piece is connected with the vehicle body conductive part and the conductive terminal and comprises a third element, the standard electrode potential of the third element is E3, and E3 is larger than E1 and smaller than E2. According to the circuit conduction assembly provided by the invention, the conductive part of the vehicle body is isolated from the conductive terminal by using the insulating part, the occurrence of galvanic corrosion is inhibited, the conduction part is used as a bridge of a current path, and the conduction part selects a third element of which the standard electrode potential E3 is between E1 and E2, so that the occurrence probability of galvanic corrosion is reduced.

Provided is a durable, pigmented, transparent inorganic-organic hybrid sol-gel coating material that mitigates galvanic corrosion of metal substrates. The coating material is generally an acid-catalyzed condensation reaction product of an organic polymeric silane (e.g., a polyol functionalized with a silane such as isocyanatopropyltrimethoxysilane or isocyanatopropyltriethoxysilane via a urethane bond or a polyamine functionalized with a silane via a urea bond), an inorganic metal alkoxide (e.g., a silicon alkoxide such as tetraethoxysilane or tetramethoxysilane), and a metal oxide nanoparticle such as silica (SiCte), which may contain other additives such as colorants and / or corrosion inhibitors.

The invention relates to an aluminothermy welding flux for a zinc-clad steel grounding material and a welding method of the aluminothermy welding flux, and belongs to the technical field of metal material welding. In order to solve the core technical problem that joint potential matching and welding firmness compatibility are difficult to realize by an existing aluminothermy welding flux for the zinc-clad steel grounding material, the invention provides the aluminothermy welding flux for the zinc-clad steel grounding material. The aluminothermy welding flux comprises iron oxide powder, aluminum powder, tin powder and nickel powder. According to the invention, the iron-based welding flux is compounded with tin and nickel, and the tin and the nickel have a synergistic effect, so that the technical prejudice that the iron-based welding flux is difficult to adapt to zinc-clad steel welding in the field is overcome, and the unexpected technical effect is realized. The tensile strength of the connector is larger than or equal to 620 MPa, the corrosion rate is smaller than 0.05 mm / year, the conductivity loss is smaller than 5%, and the performance is obviously superior to that of a copper-based connector. The problem of compatibility of potential matching and welding firmness is fundamentally solved, galvanic corrosion is eliminated, the process is simple and convenient, the cost is controllable, and corrosion prevention and engineering reliability are greatly improved.

The invention discloses a galvanic corrosion risk assessment method and device for a dissimilar metal lap joint structure, and relates to the technical field of corrosion protection, and the method comprises the steps: obtaining standard polarization curves of a plurality of metal materials for the power system design of aviation equipment, so as to form a polarization curve library; determining a first metal material and a second metal material which form the to-be-evaluated dissimilar metal lap joint structure; acquiring a first standard polarization curve of the first metal material and a second standard polarization curve of the second metal material from a polarization curve library to determine the standard galvanic corrosion current density of the lap joint structure of the galvanic anode metal material and the dissimilar metal to be evaluated; determining a target corrosion rate of the galvanic couple anode metal material; and based on the target corrosion rate, determining a galvanic corrosion risk assessment result of the to-be-assessed dissimilar metal lap joint structure. The technical problem of low efficiency of a galvanic corrosion risk assessment mode in related technologies is solved, and the technical effect of improving the efficiency of galvanic corrosion risk assessment is achieved.

The application discloses a kind of corrosion-resistant condensing heat exchanger, including: by cooling pipe component, fixed to the header of the tube component both ends, with the condensate reservoir of the tube component connection, with the tube component both ends connection pipe joint.The application also discloses a kind of corrosion-resistant condensing heat exchanger manufacturing method, the method includes the following steps: before pipe head implements welding operation, pipe head is partitioned and identified;When welding, according to the window of welding protection and deformation prevention tool design, symmetric welding is carried out;After welding is completed in window, window is rotated, and then continue welding;According to the sequence of installation tool, protection gas is filled, welding window is opened, symmetric welding, tool rotation degree, alternate welding;By detecting and judging welding quality to weld joint.The whole condensing heat exchanger of the application adopts titanium alloy one kind of material to avoid galvanic corrosion, adopts fusion welding to avoid weak link such as brazing filler metal, realizes excellent corrosion resistance in long-term operation process.