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Corrosion-resistant aluminium alloy section and preparation method thereof

A technology for corrosion-resistant aluminum alloy and aluminum alloy profiles, which is applied in metal material coating process, liquid chemical plating, coating and other directions to achieve the effects of reduced usage, high strength, and reduced annual corrosion rate

Inactive Publication Date: 2020-02-21
WUXI SHIDA PRECISION WELDED TUBE MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the strength and corrosion resistance of the existing aluminum alloy profiles need to be further improved to meet the needs of production and life for aluminum alloy profiles

Method used

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Examples

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Comparison scheme
Effect test

preparation example Construction

[0027] The preparation method of the corrosion-resistant aluminum alloy profile comprises the following steps:

[0028] Step S1: Add Al-Mn master alloy, Al-Fe master alloy, Al-Si master alloy, Al-Cu master alloy, Al-Bi master alloy to the molten aluminum according to the above ratio for mixing and smelting. The alloy solid is completely melted to obtain molten aluminum alloy;

[0029] Step S2: adding a refining agent into the molten aluminum alloy and introducing an inert gas to refine the molten aluminum alloy for 20 to 40 minutes;

[0030] Step S3: pouring the refined aluminum alloy molten liquid into the mould, standing still, cooling, and homogenizing to make an aluminum alloy ingot;

[0031] Step S4: extruding the aluminum alloy ingot at a temperature of 500° C., then performing solution treatment at a temperature of 200 to 210° C. for 5 hours, and naturally cooling to room temperature to obtain an aluminum alloy profile of a desired shape and size;

[0032] Step S5: su...

Embodiment 1

[0046] A corrosion-resistant aluminum alloy profile is composed of the following elements by weight: Mn: 1.28wt%, Fe: 0.43wt%, Si: 0.40wt%, Cu: 0.13wt%, Zn: 0.08wt%; Bi: 0.02wt% ; Ni: 0.04wt%; the rest are Al and unavoidable impurities; the content of each impurity element≤0.02wt%, the total content of the impurity elements≤0.10wt%;

[0047] The preparation method of the above-mentioned corrosion-resistant aluminum alloy profile comprises the following steps:

[0048] Step S1: Add Al-Mn master alloy, Al-Fe master alloy, Al-Si master alloy, Al-Cu master alloy, Al-Bi master alloy to the molten aluminum according to the above ratio for mixing and smelting. The alloy solid is completely melted to obtain molten aluminum alloy; wherein, the temperature for mixing and melting is 750-780°C;

[0049] Step S2: adding a refining agent into the molten aluminum alloy and introducing an inert gas, and refining the molten aluminum alloy for 20 minutes;

[0050] Step S3: pouring the refined...

Embodiment 2

[0058] The difference between embodiment 2 and embodiment 1 is:

[0059] A corrosion-resistant aluminum alloy profile is composed of the following elements by weight: Mn: 1.35wt%, Fe: 0.50wt%, Si: 0.40wt%, Cu: 0.18wt%, Zn: 0.08wt%; Bi: 0.02wt% ; Ni: 0.05wt%; the rest is Al and unavoidable impurities; the content of each impurity element is ≤0.02wt%, and the total content of the impurity elements is ≤0.10wt%.

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Abstract

The invention provides a preparation method of a corrosion-resistant aluminium alloy section. The proportion of Mn, Fe, Si, Cu, Zn, Bi, Ni and Al in aluminum alloys is preferentially selected and adjusted, so that the aluminum alloy section has higher strength and extrudability balance. The aluminum alloy section with double coatings is prepared by dip galvanizing treatment and chemical nickel-plating treatment, wherein the outer layer is an Ni coating, and the inner layer is an Al-Zn alloy coating. The inner Al-Zn alloy coating uses the primary battery principle to protect the aluminium alloysection wrapped in the inner Al-Zn alloy coating from corrosion by sacrificing chemically active Zn in the inner Al-Zn alloy coating, and the outer Ni coating protects the aluminium alloy section byusing corrosion resistance of Ni elements. The double coatings reduce the usage amount of Ni and improve the corrosion resistance of the aluminium alloy section. The tensile strength of the corrosion-resistant aluminium alloy section is 310-360MPa, and the elongation of the corrosion-resistant aluminium alloy section is 23-28. Compared with well-known 5083 aluminium alloy sections, the annual corrosion rate is decreased by 17%-38% at room temperature, and the annual corrosion rate is decreased by 23%-41% under the temperature of 300 DEG C.

Description

technical field [0001] The invention relates to the field of aluminum alloy production, in particular to a corrosion-resistant aluminum alloy profile and a preparation method thereof. Background technique [0002] Aluminum alloy profiles are the most widely used non-ferrous metals in industry. Because aluminum alloy profiles have the characteristics of low density, high strength ratio, easy processing and good welding performance, aluminum alloy profiles account for a large proportion of lightweight designs such as automotive machinery and aerospace. However, the strength and corrosion resistance of existing aluminum alloy profiles need to be further improved to meet the needs of production and life for aluminum alloy profiles. Contents of the invention [0003] In order to provide an aluminum alloy profile with higher strength and better corrosion resistance, the technical solution provided by the present invention is: [0004] The invention provides a method for prepar...

Claims

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Application Information

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IPC IPC(8): C22C21/00C22C1/03C22F1/04C23C2/06C23C18/36C23F1/30
CPCC22C1/026C22C1/03C22C21/00C22F1/04C23C2/06C23C18/36C23F1/30
Inventor 张骋
Owner WUXI SHIDA PRECISION WELDED TUBE MFG CO LTD
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