CN104862555A

CN104862555A - Antirust aluminum alloy for seaplane and preparation method thereof

Info

Publication number: CN104862555A
Application number: CN201410064441.8A
Authority: CN
Inventors: 胡蔚
Original assignee: Chengdu Zhilida Technology Co Ltd
Current assignee: Chengdu Zhilida Technology Co Ltd
Priority date: 2014-02-26
Filing date: 2014-02-26
Publication date: 2015-08-26

Abstract

The invention discloses a preparation method of an antirust aluminum alloy for a seaplane and a preparation method thereof. The antirust aluminum alloy comprises, by weight, 4.8-5.6% of Zn, 2.2-2.8% of Mg, 0.3-0.6% of Cu, 0.7-1.3% of Mn, 0.15-0.25% of Fe, 0.05-0.1% of Si, 0.1-0.2% of Zr, 0.03-0.05% of Ti, 0.05-0.15% of Sn, 0.04-0.08% of Co, 0.03-0.06% of Mo, 0.025-0.045% of Pd, 0.01-0.03% of W, 0.02-0.04% of Ce, 0.015-0.025% of Sm and the balance Al. Through use of a proper amount of Mn, Sn, Co and Mo based on an Al-Zn-Mg aluminum alloy, Al-Zn-Mg aluminum alloy corrosion resistance is substantially improved. The antirust aluminum alloy has high strength, good fracture toughness, high plasticity, low cylinder end sensitivity, excellent sea water and marine atmosphere corrosion resistance, no intergranular corrosion, exfoliation corrosion and stress corrosion tendency, and good processing and welding performances, is suitable for manufacture of seaplane skin, has good usage performances and has a wide application prospect.

Description

A kind of Sea-plane rust-preventing aluminum alloy and preparation method thereof

Technical field

The present invention relates to a kind of Sea-plane rust-preventing aluminum alloy, belong to aluminum alloy materials field.

Background technology

It is little that aluminum alloy materials has density, specific tenacity is high, specific rigidity is high, good springiness, and shock resistance is good, antirust, high connductivity, high heat conduction, easy surface colour, easily processes, the good characteristics such as recyclable regeneration, are widely used in the industries such as communications and transportation, building decoration, Sea-plane, mechanical electric apparatus, telecommunications, energy source and power.Especially, on the water in airplane industry, aluminum alloy materials is first-selected lightweight structure material, but Sea-plane is very harsh to the corrosion resistance nature of aluminum alloy materials.Therefore the Sea-plane rust-preventing aluminum alloy of a kind of highly corrosion resistant of exploitation is badly in need of.

Summary of the invention

Sea-plane rust-preventing aluminum alloy that the object of the present invention is to provide excellent anti-corrosion performance and preparation method thereof.

For achieving the above object, the present invention adopts following technical scheme:

A kind of Sea-plane rust-preventing aluminum alloy, elementary composition by following weight percent: Zn 4.8-5.6, Mg 2.2-2.8, Cu 0.3-0.6, Mn 0.7-1.3, Fe 0.15-0.25, Si 0.05-0.1, Zr 0.1-0.2, Ti 0.03-0.05, Sn 0.05-0.15, Co 0.04-0.08, Mo 0.03-0.06, Pd 0.025-0.045, W 0.01-0.03, Ce 0.02-0.04, Sm 0.015-0.025, surplus is Al.

A kind of preparation method of Sea-plane rust-preventing aluminum alloy, comprise the following steps: elementary compositionly to prepare burden by above-mentioned, furnace charge is dropped in smelting furnace successively at 745-765 DEG C, carries out melting, after metal melts completely, adjust temperature is 725-745 DEG C, add refining agent refining 15-25min, leave standstill 20-30min after skimming, alloy liquid is directly poured into casting in casting mold and obtain alloy cast ingot; The ingot casting of gained is warming up to 240-280 DEG C with 100-150 DEG C/h, insulation 3-4h, 420-450 DEG C is warming up to again with 80-120 DEG C/h, insulation 4-6h, then 230-260 DEG C is cooled to 80-100 DEG C/h, insulation 2-3h, be warming up to 505-525 DEG C with 100-150 DEG C/h again, insulation 5-10h, is then cooled to 160-180 DEG C with 140-180 DEG C/h, insulation 1-2h, be warming up to 440-460 DEG C with 120-160 DEG C/h again, insulation 4-8h, is then cooled to 200-240 DEG C with 100-150 DEG C/h, insulation 2-3h, then put into below 0-5 DEG C of icy salt solution shrend to 50 DEG C; Take out alloy and be warming up to 180-200 DEG C with 90-100 DEG C/h, insulation 10-15h, 80-90 DEG C is warming up to again with 45-55 DEG C/h, insulation 14-18h, air cooling, to room temperature, is then warming up to 75-85 DEG C with 40-50 DEG C/h, insulation 15-20h, 175-195 DEG C is warming up to again with 50-60 DEG C/h, insulation 12-16h, then be cooled to 85-95 DEG C with 40-50 DEG C/h, insulation 14-18h, air cooling is to room temperature, then be warming up to 195-215 DEG C with 95-105 DEG C/h, insulation 10-15h, then be cooled to 90-110 DEG C with 40-50 DEG C/h, insulation 12-16h, air cooling is to room temperature.

The preparation method of described refining agent is as follows: a. takes the raw material of following weight part: sodium-chlor 10-15, Repone K 5-10, sodium carbonate 3-6, magnesium fluoride 4-8, Sodium Silicofluoride 3-6, red mud 5-10, plant ash 2-4, sodium aluminum fluoride 8-12, rhombspar 5-10, diatomite 4-8, barite 5-10; B. above-mentioned sodium aluminum fluoride, rhombspar, diatomite, barite are mixed, pulverized 200-300 mesh sieve, then appropriate water wet ball grinding 12-24h is added, 110-120 DEG C of dry 1-2h, then at 760-820 DEG C of calcining 20-30min, be warming up to 1200-1250 DEG C and continue calcining 1-2h, shrend, wet ball grinding, dries, cross 200-300 mesh sieve, stand-by; C. sodium-chlor and Repone K are mixed, be heated to 810-840 DEG C, after its whole melting, add the powder that all the other raw materials and step b are obtained, stir 20-30min, then pour cold quenching in frozen water into, obtain broken particle, wet ball grinding, dries, and crosses 200-300 mesh sieve.

Beneficial effect of the present invention:

The present invention, on Al-Zn-Mg line aluminium alloy basis, adds the elements such as appropriate Mn, Sn, Co, Mo, can significantly improve the corrosion resistance nature of Al-Zn-Mg aluminium alloy.The intensity of aluminum alloy that the present invention obtains is high, fracture toughness property is good, plasticity is high, cylinder mouth susceptibility is low, and resistant to sea water and sea atmosphere corrosion excellent performance, without intergranular corrosion, Peeling Corrosion and stress corrosion inclination, processing and good welding performance, be suitable for the covering, structural part etc. that manufacture Sea-plane, use properties is good, has a extensive future.

Embodiment

(1) be: Zn 4.8-5.6, Mg 2.2-2.8, Cu 0.3-0.6, Mn 0.7-1.3, Fe 0.15-0.25, Si 0.05-0.1, Zr 0.1-0.2, Ti 0.03-0.05, Sn 0.05-0.15, Co 0.04-0.08, Mo 0.03-0.06, Pd 0.025-0.045, W 0.01-0.03, Ce 0.02-0.04, Sm 0.015-0.025 that surplus is that Al prepares burden according to the elementary composition of weight percent;

(2) dropped into successively in smelting furnace by furnace charge carry out melting at 755 DEG C, after metal melts completely, adjust temperature is 730 DEG C, adds refining agent refining 25min, leaves standstill 30min after skimming, and alloy liquid is directly poured into casting in casting mold and obtains alloy cast ingot; The ingot casting of gained is warming up to 280 DEG C with 150 DEG C/h, insulation 3h, then is warming up to 450 DEG C with 120 DEG C/h, insulation 4h, is then cooled to 240 DEG C with 100 DEG C/h, insulation 3h, be warming up to 515 DEG C with 150 DEG C/h again, insulation 8h, is then cooled to 170 DEG C with 180 DEG C/h, insulation 1h, be warming up to 450 DEG C with 140 DEG C/h again, insulation 6h, is then cooled to 230 DEG C with 120 DEG C/h, insulation 2h, then put into below 1 DEG C of icy salt solution shrend to 50 DEG C; Take out alloy and be warming up to 190 DEG C with 100 DEG C/h, insulation 12h, then be warming up to 85 DEG C with 50 DEG C/h, insulation 16h, air cooling, to room temperature, is then warming up to 80 DEG C with 45 DEG C/h, insulation 18h, then be warming up to 185 DEG C with 55 DEG C/h, insulation 14h, be cooled to 90 DEG C with 50 DEG C/h again, insulation 16h, air cooling is to room temperature, then be warming up to 210 DEG C with 105 DEG C/h, insulation 10h, then be cooled to 110 DEG C with 50 DEG C/h, insulation 12h, air cooling is to room temperature.

The preparation method of above-mentioned refining agent is as follows: a. takes the raw material of following weight (kg): sodium-chlor 12, Repone K 7, sodium carbonate 5, magnesium fluoride 6, Sodium Silicofluoride 4, red mud 8, plant ash 4, sodium aluminum fluoride 10, rhombspar 7, diatomite 6, barite 8; B. above-mentioned sodium aluminum fluoride, rhombspar, diatomite, barite are mixed, pulverized 200 mesh sieves, then add appropriate water wet ball grinding 24h, 110 DEG C of dry 2h, again at 780 DEG C of calcining 30min, be warming up to 1200 DEG C and continue calcining 2h, shrend, wet ball grinding, dry, cross 200 mesh sieves, stand-by; C. sodium-chlor and Repone K are mixed, be heated to 810 DEG C, after its whole melting, add the powder that all the other raw materials and step b are obtained, stir 30min, then pour cold quenching in frozen water into, obtain broken particle, wet ball grinding, dry, cross 250 mesh sieves.

Through inspection, obtained aluminum alloy chemical composition is: Zn 5.21%, Mg 2.46%, Cu 0.48%, Mn 1.02%, Fe 0.19%, Si 0.084%, Zr 0.16%, Ti 0.046%, Sn 0.096%, Co 0.071%, Mo 0.053%, Pd 0.037%, W 0.022%, Ce 0.035%, Sm 0.018%, and surplus is Al; Mechanical property is: tensile strength 575MPa, yield strength 521MPa, elongation 16.4%.Getting above-mentioned obtained aluminum alloy specimen immerses in 3% sodium-chlor+0.5% aqueous hydrochloric acid entirely, and after placing 24h, check result is without intergranular corrosion phenomenon.

Claims

1. a Sea-plane rust-preventing aluminum alloy, it is characterized in that, elementary composition by following weight percent: Zn 4.8-5.6, Mg 2.2-2.8, Cu 0.3-0.6, Mn 0.7-1.3, Fe 0.15-0.25, Si 0.05-0.1, Zr 0.1-0.2, Ti 0.03-0.05, Sn 0.05-0.15, Co 0.04-0.08, Mo 0.03-0.06, Pd 0.025-0.045, W 0.01-0.03, Ce 0.02-0.04, Sm 0.015-0.025, surplus is Al.

2. the preparation method of Sea-plane rust-preventing aluminum alloy as claimed in claim 1, it is characterized in that comprising the following steps: elementary compositionly to prepare burden by above-mentioned, furnace charge is dropped in smelting furnace successively at 745-765 DEG C, carries out melting, after metal melts completely, adjust temperature is 725-745 DEG C, add refining agent refining 15-25min, leave standstill 20-30min after skimming, alloy liquid is directly poured into casting in casting mold and obtain alloy cast ingot; The ingot casting of gained is warming up to 240-280 DEG C with 100-150 DEG C/h, insulation 3-4h, 420-450 DEG C is warming up to again with 80-120 DEG C/h, insulation 4-6h, then 230-260 DEG C is cooled to 80-100 DEG C/h, insulation 2-3h, be warming up to 505-525 DEG C with 100-150 DEG C/h again, insulation 5-10h, is then cooled to 160-180 DEG C with 140-180 DEG C/h, insulation 1-2h, be warming up to 440-460 DEG C with 120-160 DEG C/h again, insulation 4-8h, is then cooled to 200-240 DEG C with 100-150 DEG C/h, insulation 2-3h, then put into below 0-5 DEG C of icy salt solution shrend to 50 DEG C; Take out alloy and be warming up to 180-200 DEG C with 90-100 DEG C/h, insulation 10-15h, 80-90 DEG C is warming up to again with 45-55 DEG C/h, insulation 14-18h, air cooling, to room temperature, is then warming up to 75-85 DEG C with 40-50 DEG C/h, insulation 15-20h, 175-195 DEG C is warming up to again with 50-60 DEG C/h, insulation 12-16h, then be cooled to 85-95 DEG C with 40-50 DEG C/h, insulation 14-18h, air cooling is to room temperature, then be warming up to 195-215 DEG C with 95-105 DEG C/h, insulation 10-15h, then be cooled to 90-110 DEG C with 40-50 DEG C/h, insulation 12-16h, air cooling is to room temperature.

3. the preparation method of Sea-plane rust-preventing aluminum alloy according to claim 2, it is characterized in that, the preparation method of described refining agent is as follows: a. takes the raw material of following weight part: sodium-chlor 10-15, Repone K 5-10, sodium carbonate 3-6, magnesium fluoride 4-8, Sodium Silicofluoride 3-6, red mud 5-10, plant ash 2-4, sodium aluminum fluoride 8-12, rhombspar 5-10, diatomite 4-8, barite 5-10; B. above-mentioned sodium aluminum fluoride, rhombspar, diatomite, barite are mixed, pulverized 200-300 mesh sieve, then appropriate water wet ball grinding 12-24h is added, 110-120 DEG C of dry 1-2h, then at 760-820 DEG C of calcining 20-30min, be warming up to 1200-1250 DEG C and continue calcining 1-2h, shrend, wet ball grinding, dries, cross 200-300 mesh sieve, stand-by; C. sodium-chlor and Repone K are mixed, be heated to 810-840 DEG C, after its whole melting, add the powder that all the other raw materials and step b are obtained, stir 20-30min, then pour cold quenching in frozen water into, obtain broken particle, wet ball grinding, dries, and crosses 200-300 mesh sieve.