53 results about "Exfoliation corrosion" patented technology

The invention relates to the technical field of aluminum alloy, in particular to a high-strength corrosion-resistant aluminum alloy material and a preparation method and application thereof.The high-strength corrosion-resistant aluminum alloy material comprises, by weight, 4.5%-8.5% of Mg, 3.5%-5.5% of Zn, 0.8%-1.6% of Cu, at least two of the following elements with the total content not larger than 0.5%: 0.05%-0.15% of Mn, 0.05%-0.15% of Cr, 0.05%-0.12% of Ti, 0.06%-0.16% of Sc, 0.08%-0.14% of Er, 0.06%-0.12% of Zr and the balance Al and inevitable impurities. The total content of the impurities does not exceed 0.4%, and the balance is Al. Wherein the mass ratio of Mg to Zn is 1.1-2.0, when Sc and Zr exist at the same time, (Sc + Zr) is larger than or equal to 0.15% and smaller than or equal to 0.2%, when Er and Zr exist at the same time, (Er + Zr) is larger than or equal to 0.16% and smaller than or equal to 0.24%, and each impurity element is smaller than or equal to 0.15%. The exfoliation corrosion, stress corrosion and salt spray corrosion performance of the alloy is greatly improved by controlling the content and mass ratio of all the elements, and the exfoliation corrosion performance of the alloy is not lower than the P level; in a slow strain rate tensile test in saline water, the attenuation proportion of the elongation is not greater than 9% compared with that of an inert medium, and good stress corrosion cracking resistance is shown; in a 960h neutral salt spray corrosion test, the average corrosion rate is not greater than 0.1 g / (m < 2 >. H).

The invention relates to the technical field of aluminum alloys, in particular to a high-strength light aluminum alloy and a preparation method and application thereof. The aluminum alloy comprises the following chemical components in percentage by weight: 3.5 to 6.5 percent of Mg, 2.5 to 5.0 percent of Zn, 0.2 to 1.0 percent of Cu, 0.1 to 0.4 percent of Mn, 0.05 to 0.25 percent of Zr, 0.05 to 0.25 percent of Sc, 0 to 0.12 percent of Fe, 0 to 0.12 percent of Si and the balance of Al and inevitable impurity elements. Wherein the mass ratio of Mg to Zn is 1.0-2.0, the total content of Mn, Zr and Sc does not exceed 0.5%, the total content of Zr and Sc does not exceed 0.38%, and the mass ratio of Zr to Sc is 0.6-1.5. By accurately controlling the contents and proportions of elements such as Mg, Zn, Cu, Mn, Zr, Sc and the like, perfect combination of high strength and light weight of the alloy is realized. The density of the alloy is smaller than or equal to 2.72 g / cm < 3 >, the yield strength is larger than or equal to 350 MPa, the tensile strength is larger than or equal to 450 MPa, the ductility is larger than or equal to 10%, the welding coefficient is not smaller than 0.75, and the exfoliation corrosion performance is not lower than the EA level.

The invention discloses a high-strength 7xxx series aluminum alloy capable of being anodized and a preparation method thereof. The high-strength 7xxx series aluminum alloy capable of being anodized comprises the following components: less than 0.07% of silicon, less than or equal to 0.12% of iron, 1.2-1.6% of copper, 0.07-0.17% of manganese, 2.10-2.40% of magnesium, 0.003-0.012% of zirconium, 6.2-6.5% of zinc, less than or equal to 0.003-0.020% of titanium and the balance of aluminum and other inevitable impurity elements. The preparation method of the high-strength 7xxx series aluminum alloy capable of being anodized comprises the steps of smelting and casting, homogenizing treatment, hot extrusion and heat treatment and anodizing treatment. A 7xxx series aluminum alloy product prepared through the preparation method has good intergranular corrosion and exfoliation corrosion performance; according to the alloy performance, the tensile strength is larger than or equal to 480 MPa, the yield strength is larger than or equal to 450 MPa, and the ductility is larger than or equal to 9%; in the grain sizes of the profile, the average grain size is less than or equal to 150 microns, and the maximum grain size is less than or equal to 250 microns; and after anodic oxidation treatment, the polishing glossiness is larger than 450 GU, more obvious advantages are achieved, and the good market prospect is achieved.

The invention discloses a high-strength corrosion-resistant Al-Zn-Mg-Cu-Sc-Zr alloy plate and a preparation method thereof, and belongs to the technical field of aluminum alloy materials. The alloy comprises the following components in percentage by mass: 7.0%-8.0% of Zn, 1.5%-2.0% of Mg, 1.4%-1.8% of Cu, 0.05%-0.15% of Sc, 0.05%-0.15% of Zr, less than or equal to 0.05% of Si, less than or equal to 0.1% of Fe, less than or equal to 0.01% of Mn, less than or equal to 0.01% of Cr, less than or equal to 0.01% of Ti and the balance of Al. The preparation method comprises the steps of smelting and pouring, homogenizing annealing, hot rolling, cold rolling and solid solution aging treatment. By synergistically adding Sc and Zr, a nanoscale Al3 (Sc, Zr) dispersed phase is formed, recrystallization is inhibited, grains are refined, meanwhile, grain boundary precipitated phase distribution is optimized, and the mechanical property and corrosion resistance of the alloy are improved. The tensile strength of the obtained alloy plate reaches 590 MPa or above, the yield strength reaches 540 MPa or above, the intergranular corrosion depth is smaller than or equal to 23 micrometers, the exfoliation corrosion depth is smaller than or equal to 117 micrometers, the corrosion current density is smaller than or equal to 0.53 microamperes / cm < 2 >, and the comprehensive performance is obviously superior to that of a traditional Al-Zn-Mg-Cu alloy.

The invention provides a high-strength and high-thermal-stability Al-Cu-Mg-Si alloy and a preparation method thereof, and belongs to the technical field of aluminum alloys. The Al-Cu-Mg-Si alloy comprises the following chemical components in percentage by mass: 0.5-0.9% of Si, less than or equal to 0.5% of Fe, 3.9-5.0% of Cu, 0.4-1.2% of Mn, 0.2-0.8% of Mg, 0.15-0.2% of Zr, 0.1-0.2% of Cr, less than or equal to 0.1% of Ni, less than or equal to 0.25% of Zn, less than or equal to 0.15% of Ti, less than or equal to 0.05% of single impurity, less than or equal to 0.15% of total impurity and the balance of Al. The yield strength of the Al-Cu-Mg-Si alloy is larger than or equal to 475 MPa, the tensile strength is larger than or equal to 540 MPa, the percentage elongation after fracture is larger than or equal to 12%, after the Al-Cu-Mg-Si alloy is exposed for 100 h at the temperature of 200 DEG C, the tensile strength is larger than or equal to 210 MPa, the yield strength is larger than or equal to 188 MPa, the exfoliation corrosion level is EB, and the corrosion resistance and toughness of the Al-Cu-Mg-Si alloy are still kept at the high level while the strength and the heat stability of the aluminum alloy are improved.

The invention belongs to the technical field of aluminum alloy heat treatment, and particularly relates to an Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy and a preparation method and application thereof. Through multi-stage aging treatment, precipitated phases in the prepared aluminum alloy are uniformly and finely distributed, so that the strength and toughness of the alloy are improved. Particularly, the tensile strength and the yield strength are remarkably improved, and meanwhile, the ductility is also kept at a relatively high level. According to the Al-Zn-Mg-Cu series ultrahigh-strength aluminum alloy prepared through the method, on the premise that the strength performance is not reduced, the plasticity, toughness and corrosion resistance are improved. The L-direction tensile strength of an extruded material prepared from the ultrahigh-strength aluminum alloy reaches 800 MPa or above, the yield strength reaches 770 MPa or above, and the ductility is higher than 8%; the exfoliation corrosion performance reaches EB level, and the conductivity reaches 29.0% IACS or above.

The invention discloses a preparation method of an Al-5. 8Zn-2.2 Mg-0. 2Er-0.12 Zr aluminum alloy plate, belongs to the field of preparation of aluminum alloy plates, and particularly relates to a preparation method of an Al-5. 8Zn-2.2 Mg-0. 2Er-0.12 Zr aluminum alloy plate. The invention aims to enable the Al-Zn-Mg alloy to have high strength and greatly improve the corrosion resistance of the alloy at the same time. The preparation method comprises the following steps: weighing, smelting, refining, filtering, casting, homogenizing annealing and milling surface treatment, hot rolling, solid solution treatment, stretching, aging and sawing to obtain a finished product according to the contained elements. According to the components of the alloy, two normal-temperature tensile strength and exfoliation corrosion results are obtained through coordination and matching of homogenizing annealing, solid solution stretching and aging technological systems. And users can select according to the use environment, and the requirements of major engineering fields such as ships, ocean engineering and rail transit can be met.

7050 aluminum alloy has the problems of high deformation resistance, low production efficiency and the like. According to the traditional technical route, smelting is completed in a smelting furnace, then homogenization treatment is conducted, solution treatment and aging treatment are conducted after rolling, and therefore the use requirement is met. In order to solve the problems of low mechanical property, poor toughness, poor corrosion resistance and the like of products produced by using the traditional process in the field of airplanes, and in the traditional smelting technical route, the problems that cast ingots are non-uniform in structure and easy to crack, the fatigue property and the high-direction tensile property of the products are not easy to reach the standard during rolling of thick plates, precipitated phases are non-uniform in distribution during aging treatment, and the like exist. And the comprehensive performance of the alloy is reduced. Therefore, aiming at the 7050 aluminum alloy, the alloy components are optimized, a reasonable rolling process is prepared, and the design of a high-performance 7050 aluminum alloy production process has important significance. The autonomously optimized Sc7050-containing aluminum alloy component is Al-6. 5Zn-2.5 Mg-2. 2Cu-0. 25Sc-0.12 Zr, the strength of the Sc7050-containing aluminum alloy subjected to novel four-stage aging treatment by using the component is remarkably improved, and the exfoliation corrosion resistance reaches the EA level.

The invention relates to a structure regulation and control method for reducing exfoliation corrosion sensitivity of an aluminum-lithium alloy and the aluminum-lithium alloy, and belongs to the field of alloy heat treatment. The method comprises the following steps: homogenizing an aluminum-lithium alloy ingot to obtain a homogenized alloy; and then the homogenized alloy is subjected to deformation treatment, solution treatment, step quenching and aging treatment in sequence, and the alloy is obtained. The deformation amount of the deformation treatment is 70-95%; the temperature of the solution treatment is 500-540 DEG C, and the time is 2-5 hours; the system of step quenching is a scheme (a) or a scheme (b). According to the scheme (a), the alloy is cooled to 400-450 DEG C and kept for 1-5 min, and then water quenching cooling is conducted to 10-30 DEG C; according to the scheme (b), the alloy is cooled to 250-300 DEG C and kept for 5-20 min, and then the alloy is cooled to 10-30 DEG C through water quenching. According to the method, the exfoliation corrosion sensitivity of the aluminum-lithium alloy can be effectively reduced by regulating and controlling the grain shape of the surface layer of the alloy and blocking a corrosion channel.

The utility model provides an aluminum alloy exfoliation corrosion test device, and relates to the technical field of aluminum alloy exfoliation corrosion tests. The handle is fixedly connected to the surface of the box body and used for assisting the box body in position movement; the liquid discharging pipe is fixedly connected to the surface of the box body and used for discharging liquid and aluminum alloy in the box body; the mounting pipe is slidably connected to the inner wall of the box body and is used for assisting in mounting the beaker; the placing hook is placed on the surface of the mounting pipe and is used for placing a beaker; and the limiting device is arranged in the box body and is used for further limiting the placed beaker. Through the arrangement of the limiting device, the beaker can be further limited after being placed on the placing hook, so that the beaker cannot move when the beaker moves in the box body and liquid is injected into the beaker, and the stripping effect of aluminum alloy can be well observed after an experiment is finished; and thus, a worker can conveniently record data.

The invention discloses a strengthening method and a preparation process of a high-strength corrosion-resistant aluminum alloy, and relates to the technical field of aluminum alloy materials.The strengthening method comprises the following steps that 1-3% pre-stretching treatment is conducted on a 7-series aluminum alloy profile obtained after solid solution quenching, and a dislocation network with the dislocation density larger than or equal to 10 < 14 > m <-2 > is introduced; by controlling specific chemical components of the 7-series aluminum alloy, a foundation is laid for high performance of the material, by means of a pre-stretching-aging synergistic process, residual stress is released through plastic deformation in pre-stretching, follow-up machining deformation and stress corrosion cracking risks are reduced, a dislocation network formed by pre-stretching provides a large number of uniform nucleation points for a strengthening phase, and the stress corrosion cracking risk is reduced. By combining two-stage aging and stretching regulation, uniform dispersed precipitation of a nanoscale eta'phase is promoted, generation of a thick eta phase is inhibited, meanwhile, the nucleation tendency of a strengthening phase at a grain boundary is reduced, a fine discontinuous grain boundary precipitated phase and a narrow lean solute region are formed, intergranular corrosion resistance and exfoliation corrosion resistance are remarkably improved, and balance of strength, toughness and corrosion resistance is achieved.

The invention provides a high-strength high-toughness corrosion-resistant Al-Mg alloy material and a preparation method, the alloy material comprises a core layer and an edge layer, the edge layer is a pure aluminum layer, and the core layer is a high-magnesium aluminum alloy ingot; and the aluminum alloy material is obtained after three-stage homogenization treatment and rolling. The alloy material has high strength and excellent corrosion resistance, the intergranular corrosion weight loss is smaller than or equal to 3 mg / cm < 2 >, and the exfoliation corrosion rating is PB.

According to the high-strength-toughness corrosion-resistant aluminum alloy for the multi-cavity automobile profile and the preparation method of the high-strength-toughness corrosion-resistant aluminum alloy, recrystallization and grain growth can be effectively inhibited by optimizing chemical components of the high-strength-toughness corrosion-resistant aluminum alloy, homogenization treatment and two-stage aging treatment are combined, high dispersion and uniform precipitation of a strengthening phase are promoted, and the corrosion resistance of the high-strength-toughness corrosion-resistant aluminum alloy is improved. The precipitation strengthening effect is maximized, so that the prepared alloy has high strength and high toughness; besides, an Al-3Ti-C intermediate alloy is added as an alterant and is combined with rare earth elements, so that the alloy structure is more uniform, lattice defects and introduction of impurity elements can be reduced, and then excellent corrosion resistance is obtained; and electromagnetic stirring, ultrasonic treatment, homogenization treatment and two-stage aging treatment are combined, so that a precipitated phase is further promoted to be moderately coarsened and tends to be stable, the potential difference between the grain boundary and the intracrystalline is remarkably reduced, the intergranular corrosion and exfoliation corrosion capacities of the aluminum alloy are remarkably improved, meanwhile, part of internal stress is released, and the dimensional stability is improved.

The invention discloses a quantitative analysis method for exfoliation corrosion resistance of an aluminum alloy material, and belongs to the technical field of exfoliation corrosion resistance detection of aluminum alloy. The method comprises the following steps: (1) establishing a corresponding relation between a corrosion grade and a microscopic corrosion layer depth range; (2) uniformly dividing a to-be-tested surface of the aluminum alloy sample into a plurality of alternately distributed test surfaces and non-test surfaces, and coating the non-test surfaces with protective coatings; (3) preparing a corrosion solution according to alloy types and standard requirements, and carrying out a corrosion test; and (4) after the corrosion test is completed, cutting a section sample at the position where the surface exfoliation corrosion is most serious, measuring the depth of a corrosion layer, and determining the corrosion level by comparing the established corresponding relationship between the corrosion level and the depth range of the microscopic corrosion layer. According to the method, a numerical value corresponding relationship is established between the exfoliation corrosion level of the aluminum alloy and the actual exfoliation corrosion depth, and the exfoliation corrosion state of the surface of the aluminum alloy and the depth of a microscopic corrosion layer are associated, so that quantitative analysis of the exfoliation corrosion level is realized.

The utility model provides an auxiliary device for processing exfoliated corrosion samples, which relates to the technical field of auxiliary processing of exfoliated corrosion samples and comprises an auxiliary frame. The pressing screw rod is in threaded connection with the surface of the auxiliary frame and is used for limiting and pressing the aluminum alloy sample; the clamping strip is fixedly connected to the lower surface of the auxiliary frame and used for helping the auxiliary frame and the vice to be combined together; the rotating device is arranged on the surface of the auxiliary frame, and the aluminum alloy sample is helped to be subjected to angle rotation so as to be conveniently machined; the limiting device is arranged on the side wall of the auxiliary frame, and the sample can be conveniently and quickly placed in the middle by adjusting the distance between two limiting blocks. By arranging the rotating device, after one side of the sample is machined, the side edge of the sample can be quickly adjusted, the sample does not need to be taken from the interior of the auxiliary frame to be placed again, the adjusting speed is increased as much as possible, the replacement process is more convenient, and the working efficiency is further improved.

The invention relates to the technical field of metal material corrosion performance detection, in particular to a multifunctional aluminum alloy exfoliation corrosion sample bearing device and a using method thereof. The supporting rod is used for supporting a sample placed in the horizontal direction, the vertical direction or a set angle; the L-shaped support frame is matched with the support rod to support a set angle sample; the L-shaped hook is used for hanging a vertically placed sample; and a T-shaped mechanism is arranged at the bottom of the box body along the left-right direction and is used for fixing a vertically placed sample. By introducing the L-shaped supporting frame, the supporting rod, the T-shaped mechanism and other assemblies, batch testing can be conducted on corrosion samples of different specifications, sizes and angles, the beneficial effects of being high in efficiency, convenient, rapid, high in applicability and the like are achieved, an important auxiliary means is provided for efficient and accurate detection of an aluminum alloy exfoliation corrosion test, and the test efficiency is improved. And the device can also be applied to other total immersion tests.

The invention belongs to the technical field of integrated die casting, and particularly relates to a heat-crack-resistant and corrosion-resistant heat-treatment-free die-casting aluminum alloy, a structural part and a preparation method. According to the heat-treatment-free die-casting aluminum alloy, on the basis of a Zr-Cr-Fe coordinated regulation and control system, by regulating and controlling the component range and proportion of the Zr-Cr-Fe coordinated regulation and control system, Cr and Fe preferentially form a Chinese-character-shaped Al-Si-Cr-Fe phase, and a harmful needle-shaped Fe-rich phase is replaced; and meanwhile, Zr forms Al3Zr dispersed particles to refine crystal grains, so that the heat cracking tendency is reduced synergistically. And by regulating and controlling the component ranges of Cr, Mn, Zr and Mg and the weight ratio of Zn to Mg, intergranular corrosion and exfoliation corrosion are effectively inhibited, an MgZn2 and Mg2Si composite passivation layer is generated on the surface of the casting, and the corrosion resistance is further improved. Through the synergistic effect of multi-element alloy elements, high mechanical property, low hot cracking tendency and high corrosion resistance can be achieved without heat treatment, and the die casting is suitable for being used as an integrated die casting with strict requirements for comprehensive performance.

The application relates to a preparation method of an Al-5.8Zn-2.2Mg-0.2Er-0.12Zr aluminum alloy plate, and belongs to the field of aluminum alloy plate preparation, in particular to a preparation method of an Al-5.8Zn-2.2Mg-0.2Er-0.12Zr aluminum alloy plate. The purpose of the application is to greatly improve the corrosion performance of the Al-Zn-Mg alloy while the Al-Zn-Mg alloy has high strength. The elements contained are weighed, smelted, refined, filtered, cast, homogenized annealed, milled, hot-rolled, solid-solved, stretched, aged, and sawed into products. According to the composition of the alloy, the homogenization annealing, solid-solution stretching and aging process systems are matched, and two kinds of normal-temperature tensile strength and exfoliation corrosion results are obtained. The user can select according to the use environment, and the application can meet the needs of important engineering fields such as ships, ocean engineering and rail transit.

The invention relates to a manufacturing method of a marine corrosion-resistant aluminum alloy plate, in particular to a manufacturing method of a marine corrosion-resistant aluminum alloy plate produced by an air cushion furnace. The invention aims to solve the problem that the surface quality, the exfoliation corrosion performance and the intergranular corrosion performance of the existing marine aluminum alloy plate are not qualified. The method comprises the following steps: 1, carrying out semi-continuous casting to obtain a cast ingot of the corrosion-resistant aluminum alloy plate for the air cushion furnace production ship; (2) milling the surface of the cast ingot; (3) soaking and heating; (4) hot rolling; (5) cold rolling; the marine corrosion-resistant aluminum alloy plate produced by the air cushion furnace is qualified in size, surface quality, plate shape, mechanical property, exfoliation corrosion property and intergranular corrosion property. The method is applied to the field of aluminum alloy plate manufacturing.

The aluminum profile comprises, by mass, 0.60%-0.7% of Si, 0.10%-0.15% of Fe, 0.8%-0.12% of Cu, 0.15%-0.25% of Mn, 0.55%-0.65% of Mg, 0.14%-0.2% of Cr, 0.15%-0.003% of Zn, 0.03%-0.06% of Ti, smaller than or equal to 0.01% of Pb, smaller than or equal to 0.15% of the total content of other impurity elements and the balance Al, the alkali metal content Na is smaller than or equal to 0.0004%, the alkali metal content Ca is smaller than or equal to 0.0002%, and the hydrogen content is 0.15 ml / 100 g. The corrosion resistance of the 6005A aluminum alloy material is improved by reasonably adjusting the proportion of chemical components and the casting technological process, the corrosion resistance can be easily achieved through existing domestic aluminum alloy smelting and casting equipment, and the exfoliation corrosion resistance of the finally obtained aluminum alloy profile is obviously improved through the aluminum alloy with optimized components.

The application belongs to the field of aluminum alloy materials, and provides an aluminum alloy with a tensile strength exceeding 780 MPa and N-grade exfoliation corrosion and a preparation method thereof.The aluminum alloy comprises the following chemical components by weight percentage: Zn 10.0-12.0%, Mg 2.5-3.5%, Zr 0.08-0.25%, Ti 0.03-0.10%, Fe ≤0.10%, Si ≤0.10%, other impurities ≤0.05% individually, a total amount ≤0.15%, and the balance being Al.The preparation method comprises the following steps: alloy component distribution, water-cooled mold casting to obtain an alloy round ingot with a required specification; two-stage homogenization process treatment and extrusion process forming; two-stage solid solution and T6 peak aging, so that the tensile strength exceeds 780 MPa and the exfoliation corrosion resistance grade is N grade; and the prepared plate can be widely applied to lightweight components in the fields of aerospace, transportation and weapons.

The invention provides a 7-series aluminum alloy and a preparation method and application thereof. The preparation method comprises the following steps: preparing raw materials according to the components of the 7-series aluminum alloy; the raw materials are sequentially smelted and cast to obtain an aluminum alloy cast ingot; the aluminum alloy ingot is sequentially subjected to first-stage homogenization treatment at the temperature of 360-420 DEG C and second-stage homogenization treatment at the temperature of 460-480 DEG C, and an aluminum alloy ingot blank is obtained; performing deformation treatment on the aluminum alloy ingot blank to obtain an aluminum processing material; and the aluminum processing material is sequentially subjected to solution treatment and aging treatment, and the 7-series aluminum alloy is obtained. The composition content of the aluminum alloy is adjusted to reduce generation of refractory compounds, meanwhile, dispersed Mn-containing phase particles are formed through specific homogenization treatment, and the microstructure of the material is further improved through solid solution and aging treatment, so that the high strength is kept, and meanwhile, the mechanical property of the material is improved. The stress corrosion sensitivity is greatly reduced; the exfoliation corrosion resistance is improved; and the hydrogen embrittlement corrosion behavior is improved.

This application belongs to the field of integrated die casting technology, and more specifically, relates to heat-treatable die-cast aluminum alloys, structural parts, and preparation methods that are resistant to hot cracking and corrosion. The heat-treatable die-cast aluminum alloy provided in this application is based on a Zr-Cr-Fe synergistic control system. By controlling its composition range and ratio, Cr preferentially forms a Chinese character-shaped Al-Si-Cr-Fe phase with Fe, replacing the harmful needle-like Fe-rich phase; simultaneously, Zr forms Al3Zr dispersed particles to refine the grains, synergistically reducing the tendency for hot cracking. By controlling the composition range of Cr, Mn, Zr, and Mg, and the Zn / Mg weight ratio, intergranular corrosion and exfoliation corrosion are effectively suppressed, and a MgZn2 and Mg2Si composite passivation layer is formed on the casting surface, further improving corrosion resistance. Through the synergistic effect of multiple alloying elements, high mechanical properties, low hot cracking tendency, and strong corrosion resistance can be achieved without heat treatment, making it suitable for integrated die castings with stringent comprehensive performance requirements.

The application provides an aluminum alloy wire for 600MPa strength grade aluminum alloy electric arc additive pieces and a preparation method thereof, and belongs to the technical field of aluminum alloy wires.The aluminum alloy wire is mainly composed of aluminum (Al), zinc (Zn), magnesium (Mg), copper (Cu), strontium (Sr), zirconium (Zr), titanium (Ti), scandium (Sc), erbium (Er), cerium (Ce) and lanthanum (La). The preparation of the alloy comprises the following steps in sequence: (1) melting and casting; (2) homogenization treatment; (3) hot extrusion; (4) spiral rolling; (5) surfacing process; and (6) subsequent heat treatment. The maximum strength of the alloy can reach 600MPa, the elongation after fracture is 5.4%, and the exfoliation corrosion grade is PC grade.

The invention belongs to the technical field of aluminum alloy, and particularly relates to a novel aviation aluminum alloy material not prone to stress corrosion and a preparation method of the novel aviation aluminum alloy material. The aluminum alloy material is prepared from the following chemical components in percentage by mass: 11.2 to 13.7 percent of Zn, 1.5 to 2.8 percent of Mg, 1.5 to 2.4 percent of Cu, 0.15 to 0.76 percent of Zr, 1.0 to 2.0 percent of Y, 0.5 to 1.5 percent of Sc, 0.32 to 0.51 percent of Cr, 0.05 to 0.17 percent of Si, 0.01 to 0.08 percent of Be, 0.02 to 0.10 percent of Mn, 0.07 to 0.15 percent of Ti, 0.01 to 0.05 percent of Yb and the balance of Al. According to the invention, the components are selected, and the preparation process is combined, so that the prepared aluminum alloy is more ideal in stress corrosion resistance, exfoliation corrosion resistance, mechanical property and comprehensive performance, and can be used for aviation aluminum alloy materials.

Dispersoids 7xxx aluminum alloy products with enhanced fatigue crack growth deviation and Environmentally Assisted Cracking (EAC) resistance are disclosed. The 7xxx aluminum alloy comprises 1 to 3 wt. % Cu, 1.2 to 3 wt. % Mg, 4 to 8.5 wt. % Zn, up to 0.3 wt. % Mn, up to 0.15 wt. % Zr, up to 0.3 wt. % Cr dispersoid elements, incidental elements, and the balance Al. In one embodiment, the alloy includes Zr+Cr+Mn in the range of 0.2 to 0.8 wt. %. In another embodiment, the alloy includes Zr+Mn in the range of 0.07 to 0.7 wt. %. This alloy can be fabricated to plate, extrusion, or forging products, and is especially suitable for aerospace structural components. The products have enhanced EAC resistance and fatigue crack growth deviation resistance. Meanwhile, the products have an excellent combination of strength, fracture toughness, ductility at different orientations, and Stress Crack Corrosion (SCC), and exfoliation corrosion resistance suitable for aerospace application.

The invention discloses a forging method and a characteristic structure of an exfoliation-corrosion-resistant 7-series aluminum alloy. The method comprises the following steps: preheating an alloy ingot to 330-350 DEG C, and carrying out multidirectional forging to obtain a primary forge piece; and the primary forge piece is sequentially subjected to annealing treatment and multi-directional forging and is air-cooled to the room temperature, and the high-strength steel is obtained. By means of the method, the recrystallization degree of the alloy can be improved, and a nested structure with large recrystallization grains and a large number of small-angle grain boundary substructures or deformed structures distributed in an intermingled mode is obtained. Due to the fact that the corrosion resistance of the small-angle grain boundary is higher than that of the large-angle grain boundary, the small-angle grain boundary penetrates into metal along with corrosion in the exfoliation corrosion process, the large-angle grain boundary is corroded preferentially, a recrystallization part is hollowed out, and when corrosion enters a substructure and the small-angle grain boundary part, the corrosion rate is reduced, and the corrosion depth is controlled. On one hand, the nested structure ensures the excellent comprehensive performance of the forge piece, and on the other hand, the forge piece under various conditions and directions presents an approximate exfoliation corrosion grade which can generally reach the EA grade.

The application discloses a high-corrosion-resistance hot-rolled thick plate and a preparation method thereof. The hot-rolled thick plate comprises the following components in percentage by mass: Mg 0.75-1.0 wt.%, Si 1.35-1.75 wt.%, Fe <=0.3 wt.%, Cr 0.1-0.25 wt.%, Cu <=0.1 wt.%, Zn <=0.15 wt.%, Ti <=0.15 wt.%, and the balance of Al and inevitable total impurities. The application adjusts the composition cost of the aluminum alloy material, effectively improves the aluminum alloy chemical composition and the peeling corrosion resistance, makes the tensile strength >=310Mpa, the yield strength >=270Mpa, the elongation A50 >=10%, makes the peeling corrosion test grade N, and fully meets the use requirements of the railway bridge support, and greatly prolongs the service life of the railway bridge support.

The present application relates to a kind of organization regulation method for reducing exfoliation corrosion sensitivity of aluminum lithium alloy and aluminum lithium alloy, belong to alloy heat treatment field.The method includes: aluminum lithium alloy ingot is treated, obtains homogenization state alloy;Again homogenization state alloy is sequentially deformed, solution treatment, grading quenching and aging treatment, namely obtains;The deformation of deformation treatment is 70~95%;Solution treatment temperature is 500~540 DEG C, time is 2~5h;Grading quenching system is scheme (a) or scheme (b):Scheme (a):alloy is cooled to 400~450 DEG C and keeps 1~5min then water quenching is cooled to 10~30 DEG C;Scheme (b):alloy is cooled to 250~300 DEG C and keeps 5~20min then water quenching is cooled to 10~30 DEG C.The method can effectively reduce the exfoliation corrosion sensitivity of aluminum lithium alloy by regulating alloy surface layer grain shape and blocking corrosion channel.

The invention discloses a preparation process of a high-corrosion-resistance 6XXX aluminum alloy slab ingot in the technical field of aluminum alloy material production, and the high-corrosion-resistance 6XXX aluminum alloy slab ingot comprises the following components in percentage by mass: 0.75-0.85% of Si, less than or equal to 0.2% of Fe, less than or equal to 0.25% of Cu, 0.1-0.2% of Mn, 1.2-1.3% of Mg, less than or equal to 0.15% of Zn, 0.1-0.15% of Cr, 0.05-0.08% of Er, less than or equal to 0.15% of Ti, less than or equal to 0.05% of single other elements, less than or equal to 0.15% of other elements and the balance of Al; the alloy melt smelting and standing temperature is not higher than 750 DEG C, a launder is baked to 200-400 DEG C, during casting, the melt enters a vacuum and rotary blowing degassing and impurity removal box, a plate type filter box and a tubular filter box in sequence, multi-layer composite aluminum melt purification treatment is carried out, and after an obtained high-quality slab ingot is subjected to subsequent processing treatment, the alloy with the tensile strength larger than or equal to 290 MPa and the tensile strength larger than or equal to 290 MPa can be obtained. The exfoliation corrosion level is not lower than PA level, the intergranular corrosion depth is not higher than 100 [mu] m, and the hydrogen content is not higher than 0.1 ml / (100g. Al).