CN103103406B

CN103103406B - Antibacterial aluminum alloy for food container

Info

Publication number: CN103103406B
Application number: CN201310038297.6A
Authority: CN
Inventors: 赵忠魁; 高青; 孙清洲; 王献忠
Original assignee: Shandong Jianzhu University
Current assignee: Shandong Jianzhu University
Priority date: 2013-01-31
Filing date: 2013-01-31
Publication date: 2015-02-18
Anticipated expiration: 2033-01-31
Also published as: CN103103406A

Abstract

The invention relates to antibacterial aluminum alloy for a food container. The antibacterial aluminum alloy comprises the chemical components in percentage by weight as follows: 0.3-1.5% of Mn, 0.5-1.5% of Mg, 0.1-3.0% of Ag, 0.1-1.0% of Zn, 0.1-1.0% of RE, 0.1-0.2% of Ti, less than 0.3% of Si, less than 0.6% of Fe, less than 0.3% of Cu, less than or equal to 0.20% of other impurities and the balance of Al. The antibacterial aluminum alloy not only has excellent antibacterial performance with the antibacterial property greater than 99.0%, but also maintains good plasticity and corrosion resistance of aluminum alloy, so that the manufacturing demand and the demand on antibacterial performance of container products in industries such as food and kitchen and bath can be satisfied.

Description

A kind of Antibacterial aluminum alloy for food container

Technical field

The present invention relates to Antibacterial aluminum alloy, especially a kind of Antibacterial aluminum alloy for food container.

Background technology

Aluminium alloy due to lightweight, attractive in appearance, stainless and be easy to be shaped, make tank, lid, bottle, bucket, package foil with the form of thin plate and foil, be widely used in the occasions such as beverage, food, makeup, medicine, cigarette, Industrial products.In recent years, along with the generation of many bacteriological infection events in the whole world, fungi-proofing, antibacterial hygiene control problem receives the very big concern of society, and grocery trade, health care industry and even the hygienic requirements of general family to household utensils are more and more higher, and the demand for antimicrobial prod constantly increases.In order to meet this demand, be badly in need of the aluminium alloy that exploitation has sterilizing function.

In prior art, application number a kind of Antibacterial aluminum alloy for radiator fin that has been 201110171161.3 patent disclosure, containing 0.01-0.02%Ag, wherein every 20000mm ³just have 1 silver atoms in aluminium, so the germicidal action of only leaning on silver is not enough, wherein also add 8.5-23.5%Zn, Zn also has certain anti-microbial effect, jointly has good germ resistance by Zn and Ag.Not only require good antimicrobial property in Antibacterial aluminum alloy for food container, also require good plastic property, simultaneously too high Zn content be difficult to meet above two requirements, so this patent is only unsuitable for manufacturing containers for food use for radiator fin.

Summary of the invention

For the problems referred to above, the present invention proposes a kind of Antibacterial aluminum alloy, by weight percentage, the chemical composition of this aluminium alloy is as follows: 0.3-1.5%Mn, 0.5-1.5%Mg, 0.1-3.0%Ag, 0.1-1.0%Zn, 0.1-1.0%RE, 0.1-0.2%Ti, <0.3%Si, <0.6%Fe, <0.3%Cu, other impurity element≤0.20%, surplus is Al.This Antibacterial aluminum alloy not only has excellent anti-microbial property, and germ resistance is greater than 99.0%, and keeps the good plasticity of aluminium alloy and anti-corrosion feature, meets the industry such as food, kitchen guarding container products and makes and require and the requirement of anti-microbial property.

Antibacterial aluminum alloy of the present invention, it is characterized in that: by weight percentage, the chemical composition of this aluminium alloy is as follows: 0.3-1.5%Mn, 0.5-1.5%Mg, 0.1-3.0%Ag, 0.1-1.0%Zn, 0.1-1.0%RE, 0.1-0.2%Ti, <0.3%Si, <0.6%Fe, <0.3%Cu, other impurity element≤0.20%, surplus is Al.

In the present invention, manganese content is 0.3-1.5%, ensures that aluminium alloy has enough intensity, and has good plasticity and processing performance.Manganese content is lower than lower limit, and the intensity of alloy and hardness can not ensure, manganese content, higher than the upper limit, occurs MnAl in alloy ₆phase, alloy plasticity is deteriorated, and easy to crack during shaping, therefore manganese content of the present invention is 0.3-1.5%, preferred 1.0-1.4%.

Comparatively large containing 0.5-1.5%Mg, Mg solubleness in aluminium in the present invention, be the principal element that aluminium alloy obtains solution strengthening.Mg content is lower than 0.5%, and the strengthening effect of alloy is less, but Mg content is also unsuitable too high, and prevent it from forming intermetallic compound with the Zn added and impurity Cu, in aluminium alloy of the present invention, that Mg is 0.5-1.5%, preferred 0.7-1.2%.

Containing 0.1-3.0%Ag in the present invention, the propagation of anti-bacteria also improves anti-microbial property.As everyone knows, aluminum alloy surface forms fine and close oxide film, and the germ resistance of aluminium alloy is the germ resistance of the surface film oxide of aluminium alloy in fact.Ag is very stable, at the oxide film that aluminum alloy surface is formed, still keeps good bactericidal property.Even if Ag forms Ag on surface ₂during O, still there is good bactericidal property.Ag content lower than 0.1% time, the distribution density of silver atoms in aluminium alloy is low, and germ resistance is also lower.But Ag is precious metal, should not add too much to control final cost, taking into account best antibacterial effect and cost control the present invention and determining Ag content preferably 0.5%.

Containing 0.1-1.0%Zn in the present invention.Zn also has germicidal action, and Zn content, lower than 0.1%, does not play anti-microbial effect, but Zn content is more than 1.0%, just may form MgZn with Mg ₂low-alloyed plasticity and forming property, fall in phase, the preferred 0.5-0.8% of Zn content of the present invention.

Refer to take Ce as the mishmetal (by weight percentage, cerium content is not less than 50%) of principal element containing 0.1-1.0%RE, RE here in the present invention.Rare earth adds not only can form composite antibacterial effect with Ag, reduces the consumption of silver, also easily forms Al ₃ce phase, improves the intensity of aluminium alloy.Containing RE amount lower than 0.1% time, rare earth mainly plays solution strengthening, can not form the effect of composite antibacterial with Ag.But ree content is too high, not only increase cost, also fall low-alloyed plasticity and forming property.The preferred 0.3-0.6% of content of rare earth of the present invention.

Containing 0.1-0.2%Ti in the present invention.Ti forms Al in aluminium alloy ₃ti phase, alloy refinement aluminium alloy crystal grain, improves intensity of aluminum alloy and plasticity.Ti with RE is the same, can also change pattern and size that impurity F e and Fe and Si forms Compound Phase, alleviate the harm of its alloy plasticity and forming property.Therefore Ti content controls at 0.1-0.2% by the present invention.

In the present invention, Si, Fe and Cu reduce plasticity and the forming property of aluminium alloy, belong to harmful element, so should reduce its content as far as possible.Because interpolation RE and Ti, <0.3%Si, <0.6%Fe can meet forming requirements.Cu then forms Al together with Mg in alloy ₂cuMg, reduces alloy plasticity, so should control below 0.3%.

Test of long duration through contriver is determined, by weight percentage, the optimum content of the chemical composition of this Antibacterial aluminum alloy for food container is 1.0%Mn, 1.2%Mg, 0.5%Ag, 0.3%Zn, 0.5%RE, 0.15%Ti, Si<0.3%, Fe<0.6%, Cu<0.3%, other impurity element≤0.20%, surplus is Al.

In the present invention, except specified otherwise, described per-cent is all weight percentage.

In sum, the present invention adds Ag, Zn, RE element in Al-Mn-Mg alloy in proper range, and on the suitable intensity of guarantee aluminium alloy, good plasticity and formed foundation, the anti-microbial property of alloy product is greater than 99%.This aluminium alloy meets the industry such as beverage, food and makes container to the requirement of its mechanical property, forming property and anti-microbial property, has great economic worth and social value.

Embodiment

Embodiment 1

By weight percentage, be: 0.3%Mn, 0.5%Mg, 0.1%Ag, 0.1%Zn, 0.1%RE, 0.1%Ti, 0.3%Si, 0.6%Fe, 0.3%Cu that surplus is aluminium alloy melting in crucible electrical resistance furnace of Al by chemical composition, then carry out pouring into ingot metal.Ingot casting, at 480 DEG C of homogenizing 18h, then becomes the aluminium sheet of thick 10mm 420 DEG C of forge hots, through 380 DEG C of annealing 1h.The sheet material of the thick 1mm of cold rolling one-tenth, obtains product.

Embodiment 2

By weight percentage, by chemical composition be: 0.9%Mn, 1.0%Mg, 1.5%Ag, 0.5%Zn, 0.5%RE, 0.10%Ti, 0.15%Si, 0.3%Fe, 0.15%Cu, surplus is aluminium alloy melting in crucible electrical resistance furnace of Al, then carries out pouring into ingot metal.Ingot casting, at 485 DEG C of homogenizing 20h, then becomes the aluminium sheet of thick 10mm 420 DEG C of forge hots, through 390 DEG C of annealing 1h.The sheet material of the thick 0.4mm of cold rolling one-tenth, obtains product.

Embodiment 3

By weight percentage, be: 1.5%Mn, 1.5%Mg, 3.0%Ag, 1.0%Zn, 1.0%RE, 0.2%Ti, 0.1%Si, 0.1%Fe, 0.1%Cu that surplus is aluminium alloy melting in crucible electrical resistance furnace of Al by chemical composition, then carry out pouring into ingot metal.Ingot casting, at 500 DEG C of homogenizing 24h, then becomes the aluminium sheet of thick 10mm 420 DEG C of forge hots, through 400 DEG C of annealing 1h.The sheet material of the thick 0.5mm of cold rolling one-tenth, obtains product.

Embodiment 4

By weight percentage, by chemical composition be: 1.0%Mn, 1.2%Mg, 0.5%Ag, 0.3%Zn, 0.5%RE, 0.15%Ti, 0.26%Si, 0.58%Fe, 0.28%Cu, surplus is aluminium alloy melting in crucible electrical resistance furnace of Al, then carries out pouring into ingot metal.Ingot casting, at 490 DEG C of homogenizing 20h, then becomes the aluminium sheet of thick 10mm 420 DEG C of forge hots, through 390 DEG C of annealing 1h.The sheet material of the thick 0.8mm of cold rolling one-tenth, obtains product.

Comparative example

Alloy product obtained in above-described embodiment 1-4 and 3004 aluminium alloys are carried out antibacterial tests and mechanical property test.Germ resistance test adopts to be carried out according to Nippon Standard JIS Z 2801-2000, and tension test measures according to GB/T228.1-2010, the results are shown in Table 1.

Table 1

Specimen types	Chinese People's Anti-Japanese Military and Political College's enterobacteria rate (%)	Anti-Staphylococcus aureus rate (%)	Tensile strength/MPa	Proof strength of non-proportional R _p0.2/MPa	Maximum, force disproportional elongation (%)
						Embodiment 1	90.4	99.5	108	47	26
Embodiment 2	99.9	99.9	178	69	21
						Embodiment 3	99.9	99.9	187	73	20
Embodiment 4	99.9	99.9	183	70	20
						3004 aluminium alloys	0	0	180	70	20

As seen from Table 1, although 3004 aluminium alloys are suitable with alloy product mechanical property of the present invention, not there is germ resistance.

Claims

1. an Antibacterial aluminum alloy for food container, it is characterized in that: by weight percentage, the chemical composition of this aluminium alloy is as follows: 1.0-1.4%Mn, 0.5-1.5%Mg, 1.5-3.0%Ag, 0.1-1.0%Zn, 0.3-0.6%RE, 0.1-0.2%Ti, <0.3%Si, <0.6%Fe, <0.3%Cu, other impurity element≤0.20%, surplus is Al;

Wherein, by weight percentage, described RE is the mishmetal that cerium content is not less than 50%.

2. Antibacterial aluminum alloy according to claim 1, is characterized in that: by weight percentage, and Mg content is 0.7-1.2%.