JPS6320905B2 - - Google Patents

Description

[Detailed description of the invention]

[Industrial Field of Application] The present invention relates to an aluminum alloy plate that has excellent formability and thread rust resistance, and more specifically, the present invention relates to an aluminum alloy plate that has excellent formability and corrosion resistance as a material for land transportation vehicles, electric machine parts, etc. The present invention relates to an aluminum alloy plate with excellent formability and thread rust resistance. [Prior Art] Conventionally, land transportation vehicles such as cars, buses, trains, and subways, as well as electrical machinery products such as VCRs, have been manufactured using aluminum alloy plate surfaces to improve design and corrosion resistance after forming. It is used after applying paint. Regarding corrosion resistance, thread rust is a corrosion phenomenon that is different from normal corrosion, and although improvements are being made in paints and coating methods as a countermeasure to this problem, it has not yet been fully resolved. Aluminum alloys used in these fields are Al-4 to Al-4 in consideration of strength and formability.
5wt%Mg alloy, Al-4~5wt%Mg-0.5~2wt
There are %Zn-0.3~1.2wt%Cu alloys. There is a need for an aluminum alloy that has excellent thread rust resistance without reducing the strength and formability of the conventionally used aluminum alloys. [Problems to be Solved by the Invention] The present invention was made in view of the above-mentioned problems regarding thread rust in aluminum alloys, and is the result of repeated research by the present inventor to solve these problems. In order to suppress the occurrence of thread rust without sacrificing strength and formability, it was discovered that a composite aluminum alloy plate consisting of a core material and a skin material can be made, and aluminum with excellent formability and thread rust resistance. They developed an alloy plate. [Means for Solving the Problems] The aluminum alloy plate of the present invention, which has excellent formability and thread rust resistance, is composed of: (1) an aluminum alloy containing 3 to 10 wt% Mg, with the balance consisting of Al and impurities; As a core material, Fe0.75wt% or less, Mg0.75wt% or less, Cu0.75wt% or less, Ni0.75wt% or less, Mn0.75wt% or less, Cr0.75wt% or less, Zr0.75wt% or less, V0.75wt% Hereinafter, one or more of Si0.75wt% or less and Zn0.75wt% or less shall be regulated to a total of no more than 1wt%, and the remainder shall be aluminum consisting of Al and impurities of 99wt% or more, and the skin material shall be The first invention is an aluminum alloy plate with excellent formability and thread rust resistance, characterized in that the thickness is 2 to 20% on one side, and (2) it contains Mg3 to 10wt%, with the balance being The core material is an aluminum alloy consisting of Al and impurities, Fe0.75wt% or less, Mg0.75wt% or less, Cu0.75wt% or less, Ni0.75wt% or less, Mn0.75wt% or less, Cr0.75wt% or less, Zr0. 75wt% or less, V0.75wt% or less, Si0.75wt% or less, Zn0.75wt% or less, the total of one or more of these is regulated to be 1wt% or less, and Ti0.3wt% or less, B0.06wt% or less A molding process characterized in that the skin material is made of aluminum containing one or two of the following, the balance being 99 wt% or more of Al and impurities, and the thickness of the skin material is 2 to 20% on one side. The second invention provides an aluminum alloy plate with excellent corrosion resistance and string rust resistance, (3) containing 3 to 10 wt% of Mg, and one or two of 2 wt% or less of Zn and 1.2 wt% or less of Cu. , and the aluminum alloys are regulated to Fe 0.5wt% or less, Si 0.5wt% or less, Mn 0.5wt% or less, Cr 0.5wt% or less Zr 0.3wt% or less, V 0.3wt% or less, and the balance is Al and impurities. As a core material, Fe0.75wt% or less, Mg0.75wt% or less, Cu0.75wt% or less, Ni0.75wt% or less, Mn0.75wt% or less, Cr0.75wt% or less, Zr0.75wt% or less, V0.75wt% Hereinafter, one or more of Si 0.75wt% or less and Zn 0.75wt% or less shall be regulated to 1wt% or less in total, and the remainder shall be aluminum consisting of Al and impurities of 99wt% or more, and the skin material shall be A third invention provides an aluminum alloy plate with excellent formability and thread rust resistance, characterized in that the thickness of the plate is 2 to 20% on one side, (4) containing 3 to 10 wt% of Mg, and , Zn2wt% or less, Cu1.2wt% or less, and Fe0.5wt% or less, Si0.5wt% or less, Mn0.5wt% or less, Cr0.5wt% or less Zr0.3wt% or less , V0.3wt% or less, and the core material is an aluminum alloy containing one or both of Ti0.3wt% or less and B0.06wt% or less, the balance being Al and impurities, and Fe0.75wt%. Below, Mg 0.75wt% or less, Cu 0.75wt% or less, Ni 0.75wt% or less, Mn 0.75wt% or less, Cr 0.75wt% or less, Zr 0.75wt% or less, V 0.75wt% or less, Si 0.75wt% or less, One or more of Zn 0.75wt% or less is regulated to a total of 1wt% or less, and contains one or two of Ti 0.3wt% or less, B 0.06wt% or less, and the balance is Al with 99wt% or more. A fourth invention provides an aluminum alloy plate with excellent formability and thread rust resistance, characterized in that the skin material is made of aluminum consisting of aluminum and impurities, and the thickness of the skin material is 2 to 20% on one side. This invention consists of four inventions. The aluminum alloy plate having excellent formability and thread rust resistance according to the present invention will be described in detail below. First, the components and component ratios of the core material and the skin material will be explained. (1) Regarding the core material. Mg is an element that reduces thread rusting and increases strength. If the content is less than 3wt%, the strength will be low, and if the content exceeds 10wt%, Mg will oxidize during melting and reduce rollability. and reduce formability. Therefore, the Mg content is set to 3 to 10 wt%. Zn improves moldability and reduces thread rust resistance and rollability, and if the content exceeds 2 wt%, rollability decreases. Therefore, the Zn content should be 2wt% or less. Cu increases strength and reduces thread rust resistance and rollability, and if the content exceeds 1.2 wt%, rollability decreases. Therefore, the Cu content is
It should be 1.2wt% or less. Fe, Si, Mn, and Cr are elements that refine grains and improve rollability and strength of general ingots, but if their content exceeds 0.5wt%, formability deteriorates. The decline becomes larger. Therefore, the Fe content is 0.5wt% or less, the Si content is 0.5wt% or less, and the Mn content is 0.5wt% or less.
The content is regulated to 0.5wt% or less, and the Cr content is regulated to 0.5wt% or less. Zr and V are elements that generally refine the crystal grains of ingots, improve rollability, grain refinement after final tempering, and improve strength, but they are contained in amounts exceeding 0.3 wt%. and moldability decreases. Therefore, the Zr content is 0.3wt% or less, and the V content is 0.3wt%.
The following regulations apply. Ti has the effect of refining the grains of general ingots, and the effect is saturated when the content exceeds 0.3 wt%. Therefore, the Ti content is 0.3wt%
The following shall apply. B generally has the effect of refining the crystal grains of the ingot due to its additive effect with Ti, and the content is 0.06wt.
If the content exceeds %, the effect will be saturated. Therefore, the B content should be 0.06wt% or less. Note that Ti and B are Al-Ti, Al-B, and Al-Ti
-B can be contained as an intermediate alloy such as B. (2) Regarding leather materials. This skin material is required to have better thread rust resistance and better moldability than the core material. Fe, Mg, Cu, Ni, Mn, Cr, Zr, V, Si,
Zn is an element that reduces thread rust resistance and formability in proportion to its content, and these elements alone
If the content exceeds 0.75wt%, or 1wt% in total of two or more types, thread rust resistance and moldability will be lower than that of the core material. Therefore, the Fe content is 0.75wt% or less,
Mg content is 0.75wt% or less, Cu content is 0.75wt%
Below, the Ni content is 0.75wt% or less, and the Mn content is
0.75wt% or less, Cr content is 0.75wt% or less, Zr content is 0.75wt% or less, V content is 0.75wt% or less,
Zn content is 0.75wt% or less, Si content is 0.75wt%
It is regulated as below, and for two or more types, it is regulated to 1wt% or less. Ti has the effect of refining the crystal grains of general ingots, and the effect is saturated when the content exceeds 0.3 wt%. Therefore, the Ti content should be 0.3wt% or less. B generally has the effect of refining the crystal grains of the ingot due to its additive effect with Ti, and the content is 0.06wt.
If the content exceeds %, the effect will be saturated.
Therefore, the B content should be 0.06wt% or less. Note that Ti and B are Al-Ti, Al-B and Al-Ti
-B can be contained as an intermediate alloy. (3) Regarding the thickness of the skin material. The thickness of the skin material is an important condition for improving thread rust resistance and moldability. Depending on the purpose, the skin material is provided on one or both sides of the core material. If the thickness is less than 2% on one side, there is a risk that the skin material will be damaged during manufacturing and thread rust will occur.If the thickness exceeds 20%, thread rust resistance and moldability are good, but The decrease in strength increases. Therefore, the thickness of the skin material is set to 2 to 20% of the total thickness of the aluminum alloy plate, taking into consideration thread rust resistance, formability, and strength. [Example] Next, an example of an aluminum alloy plate having excellent formability and thread rust resistance according to the present invention will be described. Example 1 Table 1 shows typical components and component ratios of the core material and skin material of the aluminum alloy plate having excellent formability and thread rust resistance according to the present invention. The representative alloys shown in Table 1 are melted → cast → facing → heated or homogenized (400℃ x 4 hours)
→Hot rolling (rolling starts at a temperature of 400℃, plate thickness 4mm)
(Rolled to 4.1mmt→
1.0mmt)→Final heat treatment (350°C x 2 hours) was performed, and the total plate thickness was 1.0mm (the skin thickness was 5% on one side and on both sides), and the molding workability and thread rust resistance of the present invention were excellent. Table 2 shows the test results for tensile strength, Erichsen value as formability, and thread rust resistance of the aluminum alloy plates, the composite plate of the comparative example, and the core material. As is clear from Table 2, the aluminum alloy plate of the present invention, which has excellent formability and thread rust resistance, has better thread rust resistance than the comparative example of the laminated plate and the core material only. It also shows that it has high strength and excellent moldability.

【table】

【table】

[Table] Example 2 Core material (C-1) and (C-
3) and skin material (S-1), melting → casting → homogenization treatment (400℃ x 4 hours) → facing → heating (up to hot rolling temperature) → hot rolling (rolling started at a temperature of 400℃) , rolling to a plate thickness of 4mm, combined plate rolling) → cold rolling (4.1mm → 1.0mm) → final heat treatment (350℃ x 2)
time), and the total plate thickness was 1.0 mm, and the thickness of one side of the skin material was 0 to 25%, and the relationship between the thickness of the skin material, tensile strength, formability, and thread rust resistance was shown in Table 3. Shown below. The following can be seen from Table 3. (1) There is no decrease in strength when the skin thickness is 1.5%, but
Improvement in thread rust resistance is small. (2) When the thickness of the skin material is 25%, the formability and thread rust resistance are improved, but the tensile strength is about 70% of that of the core material only. (3) Therefore, the aluminum alloy plate of the present invention, which has excellent formability and thread rust resistance, has improved tensile strength, formability, and resistance by setting the thickness of the skin material to 2 to 20% on one side. It is clear that the thread rust resistance is excellent.

[Table] In Examples 1 and 2, test piece preparation conditions, thread rust resistance test conditions, and thread rust resistance evaluation will be described below. (1) Test piece preparation conditions Degreasing → washing with water → zinc phosphate treatment → washing with water → washing with pure water → drying → cationic electrodeposition (20 μm thickness, heating at 160°C for 20 minutes)
→ Intermediate coating (coating film = 30 μm, heating at 140°C for 25 minutes) → Top coating (coating film = 35 μm, heating at 145°C for 25 minutes) → Thread rust test (2) Thread rust resistance test conditions Make a notch in the paint film → Salt spray (JIS24Hr exposure) → Moisture (temperature = 45℃, humidity = 95%, 20 days exposure) → Thread rust evaluation (3) Thread rust evaluation

〔Effect of the invention〕

As explained above, since the aluminum alloy plate of the present invention with excellent formability and thread rust resistance has the above structure, it has excellent thread rust resistance and good formability. Moreover, since it has high strength, its use in land transportation vehicles, electrical equipment, etc. is progressing, and it has great industrial effects.

Claims (1)

[Claims] 1. The core material is an aluminum alloy containing 3 to 10 wt% Mg, the balance consisting of Al and impurities, Fe 0.75 wt % or less, Mg 0.75 wt % or less, Cu 0.75 wt % or less, Ni 0.75 wt % Below, one or more of the following: Mn 0.75wt% or less, Cr 0.75wt% or less, Zr 0.75wt% or less, V 0.75wt% or less, Si 0.75wt% or less, Zn 0.75wt% or less, with a total of 1wt% or less The skin material is made of aluminum consisting of Al and impurities with a balance of 99 wt% or more, and the thickness of the skin material is 2 to 20% on one side. Superior aluminum alloy plate. 2 The core material is an aluminum alloy containing 3 to 10 wt% Mg, the balance consisting of Al and impurities, Fe 0.75 wt% or less, Mg 0.75 wt% or less, Cu 0.75 wt% or less, Ni 0.75 wt% or less, Mn 0.75 wt% Below, one or more of the following: Cr 0.75wt% or less, Zr 0.75wt% or less, V 0.75wt% or less, Si 0.75wt% or less, Zn 0.75wt% or less are regulated to a total of 1wt% or less, and The skin material is made of aluminum containing one or two of Ti 0.3wt% or less and B 0.06wt% or less, and the balance is 99wt% or more Al and impurities, and the thickness of the skin material is 2 to 20% on one side. %.An aluminum alloy plate with excellent formability and thread rust resistance. 3 Contains Mg3 to 10wt%, and contains one or two of Zn2wt% or less, Cu1.2wt% or less, and Fe0.5wt% or less, Si0.5wt% or less, Mn0.5wt% or less, Cr: 0.5wt% or less Zr: 0.3wt% or less, V: 0.3wt% or less, core material made of aluminum alloy consisting of aluminum and impurities, Fe: 0.75wt% or less, Mg: 0.75wt% or less, Cu: 0.75wt% or less , Ni0.75wt% or less, Mn0.75wt% or less, Cr0.75wt% or less, Zr0.75wt% or less, V0.75wt% or less, Si0.75wt% or less, Zn0.75wt% or less. Formability and formability characterized by using aluminum as a skin material, which is regulated to 1 wt% or less in total, and the balance is 99 wt% or more of Al and impurities, and the thickness of the skin material is 2 to 20% on one side. Aluminum alloy plate with excellent thread rust resistance. 4 Contains Mg3 to 10wt%, and contains one or two of Zn2wt% or less, Cu1.2wt% or less, and Fe0.5wt% or less, Si0.5wt% or less, Mn0.5wt% or less, Aluminum that is regulated to Cr 0.5wt% or less, Zr 0.3wt% or less, V 0.3wt% or less, and contains one or both of Ti 0.3wt% or less and B 0.06wt% or less, with the balance consisting of Al and impurities. Alloy as core material, Fe0.75wt% or less, Mg0.75wt% or less, Cu0.75wt% or less, Ni0.75wt% or less, Mn0.75wt% or less, Cr0.75wt% or less, Zr0.75wt% or less, V0. One or more types of 75wt% or less, Si0.75wt% or less, Zn0.75wt% or less are regulated to a total of 1wt% or less, and one or two types of Ti0.3wt% or less and B0.06wt% or less The skin material is made of aluminum containing 99 wt% or more of Al and impurities, and the thickness of the skin material is 2 to 20% on one side. Superior aluminum alloy plate.