Marine medium-high-strength corrosion-resistant weldable aluminum alloy wallboard and preparation method thereof

Abstract

The invention provides application of an aluminum alloy wallboard in preparation of a marine aluminum alloy wallboard. The aluminum alloy wallboard comprises the following components in percentage by mass: 6.0%-6.5% of Mg, 0.80%-1.20% of Mn, 0.08%-0.12% of Zr, 0.10%-0.16% of Er, less than or equal to 0.40% of Fe, less than or equal to 0.40% of Si and the balance of Al and impurity elements. The content of the Mg element is increased, Zr and Er microalloying elements are increased, and the comprehensive performance of the wallboard material is improved through solid solution strengthening and cold hardening of Mg atoms and the microalloying effect of the Zr and Er elements. The marine medium-high-strength corrosion-resistant weldable aluminum alloy wallboard is obtained through the processes of cast ingot preparation, homogenizing annealing treatment, extrusion forming, stretch straightening and stabilizing annealing treatment. The composite material has good mechanical properties, corrosion resistance and excellent welding performance, and can be used as a structural material for high-performance ships and boats.

Description

Technical Field

[0001] The present invention belongs to the technical field of aluminum alloy sidings, and relates to the application of Al-Mg-Mn-Zr-Er series aluminum alloy sidings in the preparation of marine aluminum alloy sidings, an Al-Mg-Mn-Zr-Er series aluminum alloy siding and a preparation method thereof, and in particular to a marine medium-high strength corrosion-resistant weldable aluminum alloy siding and a preparation method thereof. Background Art

[0002] In view of the requirements of ship weight reduction, high maneuverability, hull stability, etc., aluminum alloy materials have become one of the main materials for various types of ship structures. In particular, a large number of profiles and sidings that adapt to the characteristics of ship structures are used to meet the lightweight needs of ships while ensuring the quality of ship construction. Marine corrosion-resistant aluminum alloys are mainly Al-Mg alloys, which are medium-strong non-heat-treatable strengthened aluminum alloys. The existing domestic marine aluminum alloy materials are mainly traditional medium-strength aluminum alloy materials such as 5083 and 5086. The tensile strength can only reach about 300MPa, and it is impossible to take into account good corrosion resistance and welding performance at the same time. In particular, the mechanical properties and corrosion resistance of similar domestic marine aluminum alloy extruded sidings cannot simultaneously meet the requirements of high-performance ship materials.

[0003] Therefore, how to develop a medium-to-high strength, corrosion-resistant, weldable aluminum alloy siding with better comprehensive performance to meet the demand for high-performance ship structural materials has become one of the urgent problems to be solved by many front-line researchers in the industry. Summary of the invention

[0004] In view of this, the technical problem to be solved by the present invention is to provide an Al-Mg-Mn-Zr-Er series aluminum alloy siding and a preparation method thereof, in particular, a medium-high strength corrosion-resistant weldable aluminum alloy siding for ships. The siding obtained by the present invention has good mechanical properties, corrosion resistance, and excellent welding performance, and can be used as a structural material for high-performance ships and boats. Moreover, the preparation method has a simple process, mild conditions, good controllability, and is more suitable for the promotion and application of industrial production.

[0005] The present invention provides the use of Al-Mg-Mn-Zr-Er series aluminum alloy siding in the preparation of marine aluminum alloy siding;

[0006] The Al-Mg-Mn-Zr-Er aluminum alloy wallboard comprises, by mass percentage:

[0007] Mg: 6.0% ~ 6.5%, Mn: 0.80% ~ 1.20%, Zr: 0.08% ~ 0.12%, Er: 0.10% ~ 0.16%, Fe ≤ 0.40%, Si ≤ 0.40%, and the balance is Al and impurity elements.

[0008] Preferably, the marine aluminum alloy siding comprises a weldable aluminum alloy siding;

[0009] The marine aluminum alloy wall panels include corrosion-resistant aluminum alloy wall panels.

[0010] The present invention provides an Al-Mg-Mn-Zr-Er series aluminum alloy wall plate, which comprises, by mass percentage:

[0011] Mg: 6.0% ~ 6.5%, Mn: 0.80% ~ 1.20%, Zr: 0.08% ~ 0.12%, Er: 0.10% ~ 0.16%, Fe ≤ 0.40%, Si ≤ 0.40%, and the balance is Al and impurity elements.

[0012] Preferably, the thickness of the aluminum alloy wall panel is 3 to 6 mm;

[0013] The rib height of the aluminum alloy wall panel is 40 to 100 mm;

[0014] The width of the aluminum alloy wall panel is 400-435 mm;

[0015] The length of the aluminum alloy wall panel is less than or equal to 8m;

[0016] The aluminum alloy siding is a medium-high strength, corrosion-resistant, weldable aluminum alloy siding for ships.

[0017] The present invention provides an Al-Mg-Mn-Zr-Er aluminum alloy siding used in any one of the above technical solutions or a method for preparing the Al-Mg-Mn-Zr-Er aluminum alloy siding as described in any one of the above technical solutions, comprising the following steps:

[0018] 1) After the aluminum alloy wall panel raw material is melted, it is cast to obtain an aluminum alloy ingot, and then after homogenization annealing treatment, an ingot after homogenization annealing treatment is obtained;

[0019] 2) The ingot obtained after homogenization treatment in the above steps is subjected to extrusion and stretching straightening, and then subjected to stabilization annealing treatment to obtain an aluminum alloy wall panel.

[0020] Preferably, the homogenization annealing treatment is specifically carried out by adopting a two-stage soaking system;

[0021] The first stage annealing temperature of the two-stage soaking system is 270-290°C;

[0022] The first stage annealing time of the double-stage soaking system is 10 to 12 hours.

[0023] Preferably, the second stage annealing temperature of the two-stage soaking system is 440-460°C;

[0024] The second stage annealing time of the double-stage soaking system is 24 to 28 hours;

[0025] The homogenization annealing treatment further includes an air cooling step.

[0026] Preferably, the extrusion temperature is 450-500°C;

[0027] The extrusion coefficient of the extrusion is 32 to 46;

[0028] The extrusion speed of the extrusion is 0.1-0.3 mm / s.

[0029] Preferably, the stretching rate of the stretching straightening is 1.5% to 3.0%;

[0030] The temperature of the stabilization annealing treatment is 270-290°C;

[0031] The stabilization annealing treatment time is 2 to 3 hours.

[0032] Preferably, the stabilization annealing treatment further comprises an air cooling step;

[0033] The aluminum alloy wall panels include weldable aluminum alloy wall panels.

[0034] The present invention provides an application of Al-Mg-Mn-Zr-Er aluminum alloy siding in the preparation of marine aluminum alloy siding; the Al-Mg-Mn-Zr-Er aluminum alloy siding comprises, by mass percentage, Mg: 6.0% to 6.5%, Mn: 0.80% to 1.20%, Zr: 0.08% to 0.12%, Er: 0.10% to 0.16%, Fe≤0.40%, Si≤0.40%, and the remainder of Al and impurity elements. Compared with the prior art, the present invention uses Al-Mg-Mn-Zr-Er aluminum alloy siding with a specific composition for marine aluminum alloy siding, and obtains a marine medium-high strength corrosion-resistant weldable aluminum alloy siding with excellent performance. The present invention increases the Mg element content on the basis of the existing Al-Mg alloy, and adds Zr and Er microalloying elements, and improves the comprehensive performance of the siding material through the solid solution strengthening and cold work hardening of Mg atoms and the microalloying effect of Zr and Er elements. Through ingot preparation, homogenization annealing treatment, extrusion molding, stretching straightening, and stabilization annealing treatment processes, a medium-high strength corrosion-resistant weldable aluminum alloy wall plate for ships is obtained. The medium-high strength corrosion-resistant weldable aluminum alloy wall plate for ships disclosed in the present invention and its preparation process, the wall plate obtained has good mechanical properties, corrosion resistance, and excellent welding performance, and can be used as a high-performance structural material for ships and boats.

[0035] The alloy composition used in the medium-high strength corrosion-resistant weldable aluminum alloy siding provided by the present invention increases the magnesium content to 6.0-6.5% on the basis of the existing Al-Mg alloy, and adds Zr and Er elements, which inhibits the recovery and recrystallization of the material during the extrusion process, and can improve the mechanical properties, corrosion resistance and welding properties of the extruded siding. The medium-high strength corrosion-resistant weldable aluminum alloy siding obtained by the present invention has comprehensive performance that exceeds the aluminum alloy structural materials used for existing domestic ship sidings, and can be applied to high-performance ships such as hovercraft and multi-hull ships, thereby meeting the requirements of ship weight reduction, high maneuverability, hull stability, etc.

[0036] The experimental results show that the medium-high strength corrosion-resistant weldable extruded wall plate obtained by the present invention has a tensile strength greater than 360MPa, a yield strength greater than 190MPa, and an elongation greater than 11%, which can meet the mechanical properties requirements of high-performance aluminum alloy wall plate materials for ships; and the exfoliation corrosion resistance grade is ≥ PB grade, and the intergranular corrosion resistance loss mass is ≤ 10mg / cm 2 , further meeting the corrosion resistance requirements of high-performance ship structural materials. In addition, the medium-high strength corrosion-resistant weldable wall plate has good weldability, with a tensile strength of more than 360MPa, a yield strength of more than 190MPa, and an elongation of more than 11% after welding, which effectively improves the welding performance of marine aluminum alloy structural materials and meets the strength requirements of high-performance ship structural materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 A schematic diagram showing the preparation process of the medium-high strength corrosion-resistant weldable aluminum alloy siding provided by the present invention;

[0038] Figure 2 This is a physical picture of the medium-high strength, corrosion-resistant, weldable aluminum alloy siding for ships prepared in Example 1 of the present invention;

[0039] Figure 3 This is a real picture of the medium-high strength, corrosion-resistant, weldable aluminum alloy wall panel for ships prepared in Example 1 of the present invention after welding. DETAILED DESCRIPTION

[0040] In order to further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples, but it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, rather than limiting the claims of the invention.

[0041] All raw materials of the present invention have no particular limitation on their sources, and can be purchased from the market or prepared according to conventional methods known to those skilled in the art.

[0042] There is no particular restriction on the purity of all raw materials in the present invention. The present invention preferably uses industrial pure materials or materials with conventional purity requirements in the field of preparing marine aluminum alloy sidings.

[0043] The brands and abbreviations of all raw materials of the present invention are conventional brands and abbreviations in the art. Each brand and abbreviation is clear and definite in the field of its related use. Those skilled in the art can purchase them from the market or prepare them by conventional methods according to the brands, abbreviations and corresponding uses.

[0044] The abbreviations of the processes used in the present invention are all conventional abbreviations in the field. The specific steps and conventional parameters of each abbreviation are clear and definite in its relevant field. Those skilled in the art can implement them in a conventional manner based on the abbreviations.

[0045] The present invention provides the use of Al-Mg-Mn-Zr-Er series aluminum alloy siding in the preparation of marine aluminum alloy siding;

[0046] The Al-Mg-Mn-Zr-Er aluminum alloy wallboard comprises, by mass percentage:

[0047] Mg: 6.0% ~ 6.5%, Mn: 0.80% ~ 1.20%, Zr: 0.08% ~ 0.12%, Er: 0.10% ~ 0.16%, Fe ≤ 0.40%, Si ≤ 0.40%, and the balance is Al and impurity elements.

[0048] In the present invention, the Al-Mg-Mn-Zr-Er aluminum alloy wallboard comprises, by mass percentage:

[0049] Mg: 6.0% ~ 6.5%, Mn: 0.80% ~ 1.20%, Zr: 0.08% ~ 0.12%, Er: 0.10% ~ 0.16%, Fe ≤ 0.40%, Si ≤ 0.40%, the balance of Al and impurity elements can be Mg: 6.1% ~ 6.4%, Mn: 0.85% ~ 1.15%, Zr: 0.09% ~ 0.11%, Er: 0.11% ~ 0.15%, Fe ≤ 0.35%, Si ≤ 0.35%, can be Mg: 6.2% ~ 6.3%, Mn: 0.9% ~ 1.1%, Zr: 0.1% ~ 0.11%, Er: 0.12% ~ 0.14%, Fe ≤ 0.3%, Si ≤ 0.3%.

[0050] In the present invention, the aluminum alloy wall panel is an aluminum alloy extruded profile.

[0051] In the present invention, the marine aluminum alloy wall panels preferably include weldable aluminum alloy wall panels.

[0052] In the present invention, the marine aluminum alloy wall plate preferably includes a corrosion-resistant aluminum alloy wall plate.

[0053] The present invention provides an Al-Mg-Mn-Zr-Er series aluminum alloy wall plate, which comprises, by mass percentage:

[0054] Mg: 6.0% ~ 6.5%, Mn: 0.80% ~ 1.20%, Zr: 0.08% ~ 0.12%, Er: 0.10% ~ 0.16%, Fe ≤ 0.40%, Si ≤ 0.40%, the balance of Al and impurity elements can be Mg: 6.1% ~ 6.4%, Mn: 0.85% ~ 1.15%, Zr: 0.09% ~ 0.11%, Er: 0.11% ~ 0.15%, Fe ≤ 0.35%, Si ≤ 0.35%, can be Mg: 6.2% ~ 6.3%, Mn: 0.9% ~ 1.1%, Zr: 0.1% ~ 0.11%, Er: 0.12% ~ 0.14%, Fe ≤ 0.3%, Si ≤ 0.3%.

[0055] In the present invention, the thickness of the aluminum alloy wall plate is preferably 3 to 6 mm, more preferably 4 to 5 mm, and specifically 3 to 4 mm.

[0056] In the present invention, the rib height of the aluminum alloy wall panel is preferably 40 to 100 mm, more preferably 50 to 90 mm, and even more preferably 60 to 80 mm.

[0057] In the present invention, the width of the aluminum alloy wall panel is preferably 400-435 mm, more preferably 405-430 mm, and more preferably 410-425 mm.

[0058] In the present invention, the length of the aluminum alloy wall plate is preferably less than or equal to 8 m, more preferably less than or equal to 7 m, more preferably 5 m, and specifically can be 6 to 8 m.

[0059] In the present invention, the aluminum alloy wall panels are preferably medium-high strength, corrosion-resistant and weldable aluminum alloy wall panels for ships.

[0060] The alloy composition used in the medium-high strength corrosion-resistant weldable aluminum alloy wall panel of the present invention increases the magnesium content to 6.0-6.5% on the basis of the existing Al-Mg alloy, and adds Zr and Er elements, so as to improve the mechanical properties, corrosion resistance and welding performance of the wall panel; the obtained medium-high strength corrosion-resistant weldable wall panel has a tensile strength greater than 360MPa, a yield strength greater than 190MPa, an elongation greater than 11%, an anti-scaling corrosion grade ≥PB grade, and an anti-intergranular corrosion loss mass ≤10mg / cm 2 At the same time, the aluminum alloy wall panel described in the present invention has good welding performance, with a tensile strength greater than 350MPa, a yield strength greater than 190MPa, and an elongation greater than 11% after welding. The medium-high strength corrosion-resistant weldable extruded aluminum alloy wall panel obtained by the present invention has a comprehensive performance that exceeds the aluminum alloy material used for the extruded wall panel currently used in China, and can be applied to high-performance ships such as hovercraft and multi-hull ships, thereby meeting the requirements of ship weight reduction, high maneuverability, hull stability, etc.

[0061] The present invention provides an Al-Mg-Mn-Zr-Er aluminum alloy siding used in any one of the above technical solutions or a method for preparing the Al-Mg-Mn-Zr-Er aluminum alloy siding as described in any one of the above technical solutions, comprising the following steps:

[0062] 1) After the aluminum alloy wall panel raw material is melted, it is cast to obtain an aluminum alloy ingot, and then after homogenization annealing treatment, an ingot after homogenization annealing treatment is obtained;

[0063] 2) The ingot obtained after homogenization treatment in the above steps is subjected to extrusion and stretching straightening, and then subjected to stabilization annealing treatment to obtain an aluminum alloy wall panel.

[0064] The invention firstly melts the aluminum alloy wallboard raw material, casts it to obtain an aluminum alloy ingot, and then performs homogenization annealing treatment to obtain the homogenized annealed ingot.

[0065] In the present invention, the homogenization annealing treatment is preferably performed by using a double-stage soaking system.

[0066] In the present invention, the first stage annealing temperature of the double-stage soaking system is preferably 270-290°C, more preferably 275-285°C, and specifically 280°C.

[0067] In the present invention, the first stage annealing time of the two-stage soaking system is preferably 10 to 12 hours, more preferably 10.5 to 11.5 hours, and specifically 10 to 11 hours.

[0068] In the present invention, the second stage annealing temperature of the double-stage soaking system is preferably 440-460°C, more preferably 445-455°C.

[0069] In the present invention, the second stage annealing time of the double-stage soaking system is preferably 24 to 28 hours, more preferably 24.5 to 27.5 hours, more preferably 25 to 27 hours, and more preferably 25.5 to 26.5 hours.

[0070] In the present invention, the homogenization annealing treatment preferably further includes an air cooling step.

[0071] In the present invention, the ingot obtained through the homogenization treatment in the above steps is finally subjected to extrusion and stretching straightening, and then subjected to stabilization annealing treatment to obtain an aluminum alloy wall plate.

[0072] In the present invention, the extrusion temperature is preferably 450-500°C, more preferably 460-490°C, and even more preferably 470-480°C.

[0073] In the present invention, the extrusion coefficient of the extrusion is preferably 32-46, more preferably 35-43, and more preferably 38-40.

[0074] In the present invention, the extrusion speed is preferably 0.1 to 0.3 mm / s, more preferably 0.14 to 0.26 mm / s, and more preferably 0.18 to 0.22 mm / s.

[0075] In the present invention, the stretching ratio of the stretching straightening is preferably 1.5% to 3.0%, more preferably 1.8% to 2.7%, and more preferably 2.1% to 2.4%.

[0076] In the present invention, the temperature of the stabilization annealing treatment is preferably 270 to 290°C, more preferably 274 to 286°C, and even more preferably 278 to 282°C.

[0077] In the present invention, the stabilization annealing treatment time is preferably 2 to 3 hours, more preferably 2.2 to 2.8 hours, more preferably 2.4 to 2.6 hours, and specifically 2 to 2.5 hours.

[0078] In the present invention, the stabilization annealing treatment preferably further includes an air cooling step.

[0079] In the present invention, the aluminum alloy wall panel preferably includes a weldable aluminum alloy wall panel.

[0080] The present invention increases the Mg content on the basis of the existing Al-Mg alloy, and adds Zr and Er microalloying elements, and improves the comprehensive performance of the wall panel material through the solid solution strengthening and cold work hardening of Mg atoms, as well as the microalloying effect of Zr and Er elements. After ingot preparation, homogenization annealing treatment, extrusion molding, stretching straightening, and stabilization annealing treatment processes, a medium-high strength, corrosion-resistant, weldable aluminum alloy wall panel for ships is obtained. The medium-high strength, corrosion-resistant, weldable aluminum alloy wall panel for ships disclosed in the present invention and the preparation method thereof, the obtained wall panel has good mechanical properties, corrosion resistance, and excellent welding performance, and can be used as a high-performance structural material for ships and boats.

[0081] The present invention is a complete and detailed overall technical solution, which better guarantees the structure and composition of Al-Mg-Mn-Zr-Er aluminum alloy siding, and further improves the mechanical properties, corrosion resistance and welding performance of Al-Mg-Mn-Zr-Er aluminum alloy siding. The application of the above-mentioned Al-Mg-Mn-Zr-Er aluminum alloy siding in the preparation of marine aluminum alloy siding, a medium-high strength corrosion-resistant weldable aluminum alloy siding for ships and a preparation method thereof may specifically include the following contents:

[0082] A medium-high strength corrosion-resistant weldable aluminum alloy wall plate for ships, wherein the alloy components are as follows by mass percentage: Mg content is 6.0-6.5%, Mn is 0.80-1.20%, Zr is 0.08-0.12%, Er is 0.10-0.16%, Fe is ≤0.4%, Si is ≤0.4%, and the rest is Al;

[0083] A method for preparing medium-high strength corrosion-resistant weldable aluminum alloy siding for ships, comprising the following steps:

[0084] Step 1: Melting and casting the alloy raw materials according to the proportion of ingredients to obtain aluminum alloy round ingots for wall panels;

[0085] Step 2: homogenizing the ingot obtained in step 1 by annealing. The homogenizing annealing adopts a two-stage soaking system. The first stage annealing temperature is 280° C., the annealing time is 10 h, the second stage annealing temperature is 450° C., the annealing time is 24-28 h, and air cooling is adopted for cooling.

[0086] Step 3: Extruding the ingot after homogenization annealing into a wall plate, the extrusion process requirements are: extrusion temperature 450-500°C, extrusion coefficient 32-46, extrusion speed 0.1-0.3 mm / s;

[0087] Step 4: stretch and straighten the extruded wall panel obtained in step 3, with the stretching rate required to be 1.5% to 3.0%;

[0088] Step 5: Perform stabilization annealing treatment on the wall panels obtained in step 4. The annealing temperature is required to be 270-290° C., the annealing time is required to be 2 hours, and air cooling is adopted after the wall panels are taken out of the furnace.

[0089] Specifically, in step three, the extrusion process requirements are: extrusion temperature 450-500° C., extrusion coefficient 32-46, and extrusion speed 0.1-0.3 mm / s.

[0090] Specifically, the stretching rate in step 4 is required to be 2.0% to 3.0%.

[0091] Specifically, in step five, the annealing temperature is required to be 270-290° C., the annealing time is required to be 2 hours, and air cooling is adopted after the furnace is taken out.

[0092] By adopting the above method, the preparation process is simple, the dimensional accuracy of the wall panel is high, the tensile strength exceeds 360MPa, the corrosion resistance and welding performance are good, and a medium-high strength, corrosion-resistant and weldable aluminum alloy wall panel for ships is obtained.

[0093] In a preferred embodiment, the ingot homogenization annealing in the step 2 adopts a two-stage homogenization system, the first stage annealing temperature is 280°C, the annealing time is 10h, the second stage annealing temperature is 450°C, the annealing time is 24h, and air cooling is adopted; by adopting the above homogenization annealing method, the second phase at the grain boundary is fully dissolved, and the component segregation phenomenon is basically eliminated, so that the ingot structure is uniform and the processing performance is improved.

[0094] In a preferred embodiment, the extrusion temperature in step 3 is controlled at 450-460° C. The above method can effectively ensure good formability of the extruded wall panel.

[0095] In a preferred embodiment, the stretching rate in step 4 is controlled at 2.5%. By adopting the above method, the dimensional accuracy of the extruded wallboard can be controlled and the mechanical properties of the wallboard can be guaranteed.

[0096] In a preferred embodiment, in step 5, the annealing temperature is set to 280° C. and the annealing time is set to 2 hours. The above method is used to control the microstructure of the extruded wallboard, effectively reducing the influence of the continuous precipitation of β phase at the grain boundary on the corrosion performance of the material.

[0097] See also Figure 1 , Figure 1 The present invention provides a simplified schematic diagram of the preparation process of the medium-high strength corrosion-resistant weldable aluminum alloy siding.

[0098] The above content of the present invention provides the application of Al-Mg-Mn-Zr-Er series aluminum alloy wall panels in the preparation of marine aluminum alloy wall panels, a medium-high strength corrosion-resistant weldable aluminum alloy wall panel for ships and a preparation method thereof. The present invention uses Al-Mg-Mn-Zr-Er series aluminum alloy wall panels with a specific composition for marine aluminum alloy wall panels, and obtains medium-high strength corrosion-resistant weldable aluminum alloy wall panels with excellent performance for ships. The present invention increases the Mg element content on the basis of the existing Al-Mg series alloy, and adds Zr and Er microalloying elements, and improves the comprehensive performance of the wall panel material through the solid solution strengthening and cold working hardening of Mg atoms, as well as the microalloying effect of Zr and Er elements. After ingot preparation, homogenization annealing treatment, extrusion molding, stretching straightening, and stabilization annealing treatment processes, a medium-high strength corrosion-resistant weldable aluminum alloy wall panel for ships is obtained. The medium-high strength corrosion-resistant weldable aluminum alloy siding for ships and the preparation process thereof disclosed in the present invention have good mechanical properties, corrosion resistance and excellent welding properties, and can be used as a structural material for high-performance ships and boats.

[0099] The alloy composition used in the medium-high strength corrosion-resistant weldable aluminum alloy siding provided by the present invention increases the magnesium content to 6.0-6.5% on the basis of the existing Al-Mg alloy, and adds Zr and Er elements, which inhibits the recovery and recrystallization of the material during the extrusion process, and can improve the mechanical properties, corrosion resistance and welding properties of the extruded siding. The medium-high strength corrosion-resistant weldable aluminum alloy siding obtained by the present invention has comprehensive performance that exceeds the aluminum alloy structural materials used for existing domestic ship sidings, and can be applied to high-performance ships such as hovercraft and multi-hull ships, thereby meeting the requirements of ship weight reduction, high maneuverability, hull stability, etc.

[0100] The experimental results show that the medium-high strength corrosion-resistant weldable extruded wall plate obtained by the present invention has a tensile strength greater than 360MPa, a yield strength greater than 190MPa, and an elongation greater than 11%, which can meet the mechanical properties requirements of high-performance aluminum alloy wall plates for ships; and the exfoliation corrosion resistance grade is ≥ PB grade, and the intergranular corrosion resistance loss mass is ≤ 10mg / cm 2 , further meeting the corrosion resistance requirements of high-performance ship structural materials. In addition, the medium-high strength corrosion-resistant weldable wall plate has good weldability, with a tensile strength of more than 360MPa, a yield strength of more than 190MPa, and an elongation of more than 11% after welding, which effectively improves the welding performance of marine aluminum alloy structural materials and meets the strength requirements of high-performance ship structural materials.

[0101] To further illustrate the present invention, the application of the Al-Mg-Mn-Zr-Er aluminum alloy siding provided by the present invention in the preparation of marine aluminum alloy siding, an Al-Mg-Mn-Zr-Er aluminum alloy siding and a preparation method thereof are described in detail below in combination with the embodiments. However, it should be understood that these embodiments are implemented on the premise of the technical scheme of the present invention, and detailed implementation methods and specific operating processes are given only to further illustrate the features and advantages of the present invention, rather than to limit the claims of the present invention, and the protection scope of the present invention is not limited to the following embodiments.

[0102] Example 1

[0103] Step 1, obtaining an aluminum alloy round ingot for extruded wall panels by batching and melting;

[0104] Step 2: The ingot is subjected to homogenization annealing treatment; (280℃ / 10h+450℃ / 24h)

[0105] Step 3: Extruding the ingot into a wall plate, the extrusion process requirements are: extrusion temperature 450-460°C, extrusion coefficient 38.6, extrusion speed 0.3 mm / s;

[0106] Step 4: stretch and straighten the extruded siding obtained in step 3, with the stretching rate required to be 2.5%;

[0107] Step 5: Perform stabilization annealing treatment on the wall panels obtained in step 4. The annealing temperature is required to be 280° C. and the annealing time is required to be 2 hours. After being taken out of the furnace, the wall panels are cooled by air cooling.

[0108] See Table 1, which shows the room temperature tensile properties and corrosion performance data of the wall panel prepared in Example 1 of the present invention.

[0109] Table 1

[0110] serial number Tensile strength / MPa Yield strength / MPa Elongation / % Exfoliation corrosion <![CDATA[Intergranular corrosion / (mg / cm 2 )]]> 1# 380 196 18.5 PB 5 2# 383 202 18 PB 5

[0111] See also Figure 2 , Figure 2 This is a physical picture of the medium-to-high-strength, corrosion-resistant, weldable aluminum alloy siding for ships prepared in Example 1 of the present invention.

[0112] After friction stir welding, the mechanical properties and corrosion properties of the wall panel did not show a significant decrease, and the welding performance was good.

[0113] See also Figure 3 , Figure 3 This is a real picture of the medium-high strength, corrosion-resistant, weldable aluminum alloy wall panel for ships prepared in Example 1 of the present invention after welding.

[0114] See Table 2, which shows the room temperature tensile properties of the weld of the wall panel prepared in Example 1 of the present invention.

[0115] Table 2

[0116] serial number Tensile strength / MPa Yield strength / MPa Elongation / % 1# 374 200 12.0 2# 390 217 13.3

[0117] Example 2

[0118] The alloy composition and preparation method are consistent with those in Example 1, except that the extrusion temperature is 460-470° C. and the extrusion speed is 0.3 mm / s.

[0119] See Table 3, which shows the room temperature tensile properties and corrosion properties of the wall panels prepared in Example 2 of the present invention.

[0120] Table 3

[0121] serial number Tensile strength / MPa Yield strength / MPa Elongation / % Exfoliation corrosion <![CDATA[Intergranular corrosion / (mg / cm 2 )]]> 1# 385 199 16.5 PB 6 2# 371 197 15.5 PB 6

[0122] Example 3

[0123] The alloy composition and preparation method are consistent with those in Example 1, except that the elongation rate is controlled to be 2.0%.

[0124] See Table 4, which shows the room temperature tensile properties and corrosion performance results of the wall panel prepared in Example 3 of the present invention.

[0125] Table 4

[0126] serial number Tensile strength / MPa Yield strength / MPa Elongation / % Exfoliation corrosion <![CDATA[Intergranular corrosion / (mg / cm 2 )]]> 1# 377 251 16.5 PB 6 2# 381 269 16 PB 7

[0127] Example 4

[0128] The alloy composition and preparation method are consistent with those in Example 1, except that the annealing system is 270° C.×2 h.

[0129] See Table 5, which shows the room temperature tensile properties and corrosion performance results of the wall panels prepared in Example 4 of the present invention.

[0130] Table 5

[0131] serial number Tensile strength / MPa Yield strength / MPa Elongation / % Exfoliation corrosion <![CDATA[Intergranular corrosion / (mg / cm 2 )]]> 1# 412 274 18 PB 7 2# 405 271 17.5 PB 7

[0132] The above is a detailed introduction to a medium-high strength corrosion-resistant weldable aluminum alloy siding for ships provided by the present invention, and its preparation method and application. In this article, specific examples are used to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention, including the best mode, and also enables any technician in the field to practice the present invention, including the manufacture and use of any device or system, and the implementation of any combined method. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. The scope of patent protection of the present invention is defined by the claims and may include other embodiments that can be thought of by those skilled in the art. If these other embodiments have structural elements that are not different from the text of the claims, or if they include equivalent structural elements that are not substantially different from the text of the claims, then these other embodiments should also be included in the scope of the claims.

Claims

1. Application of Al-Mg-Mn-Zr-Er aluminum alloy siding in the preparation of marine aluminum alloy siding; The Al-Mg-Mn-Zr-Er aluminum alloy wallboard comprises, by mass percentage: Mg: 6.0%~6.5%, Mn: 0.80%~1.20%, Zr: 0.08%~0.12%, Er: 0.10%~0.16%, Fe≤0.40%, Si≤0.40%, the balance is Al and impurity elements.

2. The use according to claim 1, characterized in that: The marine aluminum alloy siding includes a weldable aluminum alloy siding; The marine aluminum alloy wall panels include corrosion-resistant aluminum alloy wall panels.

3. An Al-Mg-Mn-Zr-Er aluminum alloy wall panel, characterized in that: In terms of mass percentage, it includes: Mg: 6.0% ~ 6.5%, Mn: 0.80% ~ 1.20%, Zr: 0.08% ~ 0.12%, Er: 0.10% ~ 0.16%, Fe ≤ 0.40%, Si ≤ 0.40%, and the balance is Al and impurity elements.

4. The aluminum alloy wall panel according to claim 3, characterized in that: The thickness of the aluminum alloy wall panel is 3 to 6 mm; The rib height of the aluminum alloy wall panel is 40 to 100 mm; The width of the aluminum alloy wall panel is 400-435 mm; The length of the aluminum alloy wall panel is less than or equal to 8m; The aluminum alloy siding is a medium-high strength, corrosion-resistant, weldable aluminum alloy siding for ships.

5. A method for preparing the Al-Mg-Mn-Zr-Er aluminum alloy siding used in any one of claims 1 to 2 or the Al-Mg-Mn-Zr-Er aluminum alloy siding as claimed in any one of claims 3 to 4, characterized in that: The following steps are involved: 1) After the aluminum alloy wall panel raw material is melted, it is cast to obtain an aluminum alloy ingot, and then after homogenization annealing treatment, an ingot after homogenization annealing treatment is obtained; 2) The ingot obtained after homogenization treatment in the above steps is subjected to extrusion and stretching straightening, and then subjected to stabilization annealing treatment to obtain an aluminum alloy wall panel.

6. The preparation method according to claim 5, characterized in that: The homogenization annealing treatment is specifically carried out by adopting a double-stage soaking system; The first stage annealing temperature of the two-stage soaking system is 270-290°C; The first stage annealing time of the double-stage soaking system is 10 to 12 hours.

7. The preparation method according to claim 6, characterized in that: The second stage annealing temperature of the double-stage soaking system is 440-460°C; The second stage annealing time of the double-stage soaking system is 24 to 28 hours; The homogenization annealing treatment further includes an air cooling step.

8. The preparation method according to claim 6, characterized in that: The extrusion temperature is 450-500°C; The extrusion coefficient of the extrusion is 32 to 46; The extrusion speed of the extrusion is 0.1-0.3 mm / s.

9. The preparation method according to claim 6, characterized in that: The stretching rate of the stretching straightening is 1.5% to 3.0%; The temperature of the stabilization annealing treatment is 270-290°C; The stabilization annealing treatment time is 2 to 3 hours.

10. The preparation method according to claim 6, characterized in that: The stabilization annealing treatment further comprises an air cooling step; The aluminum alloy wall panels include weldable aluminum alloy wall panels.

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