Pretreatment method for improving natural aging stability of 6000 series aluminum alloy material

A technology of aluminum alloy materials and natural aging, which is applied in the field of pretreatment of aluminum alloy materials, can solve the problems of high cost, achieve the effects of increasing stamping yield, reducing production costs, and prolonging the retention time of bake hardenability

Active Publication Date: 2019-06-04
BAOSHAN IRON & STEEL CO LTD +1
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Problems solved by technology

However, this method requires automobile factories to either adjust the existing manufacturing process and increase investment in solution quenching equipment, or use low-temperature devices to transport and store aluminum plates to inhibit natural aging. Either way, the cost is expensive

Method used

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  • Pretreatment method for improving natural aging stability of 6000 series aluminum alloy material
  • Pretreatment method for improving natural aging stability of 6000 series aluminum alloy material
  • Pretreatment method for improving natural aging stability of 6000 series aluminum alloy material

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Embodiment 1-6 and comparative example 1

[0037] In the various embodiments and comparative examples of this case, the 6000 series aluminum alloy ingot is subjected to homogenization heat treatment, hot-rolled and cold-rolled into a cold-rolled plate with a thickness of 1mm, and then it is subjected to the pretreatment shown in each embodiment and comparative example. Process, preprocessing steps include (the specific parameters of each embodiment and comparative example are listed in Table 2):

[0038] (1) Solution quenching treatment: solid solution for 10-50 minutes, the solution temperature is 500-560°C, and then cooled to room temperature at a cooling rate of 30-150°C / s, and the cooling method is water cooling;

[0039] (2) Low-temperature pre-aging treatment within 24 hours: control the temperature at 50-70°C and keep warm for 0-72 hours;

[0040] (3) Pre-stretch deformation within 24 hours: the deformation amount is 2-5%;

[0041](4) Perform high-temperature pre-aging treatment within 168 hours: control the te...

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Abstract

The invention discloses a pretreatment method for improving the natural aging stability of a 6000 series aluminum alloy material. The pretreatment method comprises the following steps that (1) solid solution quenching treatment is carried out, wherein solid solution is carried out on the 6000 series aluminum alloy material for 10-50 minutes, the solid solution temperature is 500-560 DEG C, and then cooling is carried out; (2) low-temperature pre-aging treatment is carried out within 24 hours, wherein the temperature is controlled to be is 50-70 DEG C, and heat preservation is carried out for 0-72 hours; (3) pre-stretching deformation is carried out in 24 hours, wherein the deformation amount is 2-5%; and (4) high-temperature pre-aging treatment is carried out in 168 hours, wherein the temperature is controlled to be 100-160 DEG C, and heat preservation is carried out for 5-30 minutes. According to the pretreatment method for improving the natural aging stability of the 6000 series aluminum alloy material, the natural aging stability and the baking hardening performance of an aluminum plate can be obviously improved, and a satisfactory baking hardening effect can be achieved on an existing paint baking equipment line of an automobile factory.

Description

technical field [0001] The invention relates to a pretreatment method for metal materials, in particular to a pretreatment method for aluminum alloy materials. Background technique [0002] Energy saving and emission reduction has become one of the important goals of the development of the automobile industry, and automobile lightweight is the main direction to achieve this goal. Aluminum alloy has become the first choice for lightweight materials for automobiles due to its light weight, wear and corrosion resistance, high specific strength, good impact resistance, easy coloring and recycling. After quenching treatment, it has good formability, and its age-hardening potential can be further exerted by the coating and baking process of stamping parts of car body. It is an ideal replacement material for car body outer panels. [0003] However, the 6000-series aluminum alloy sheet usually needs to be placed at room temperature for 1 to 6 months after solution quenching and bef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/043
Inventor 曾渝黄元春徐世伟唐建国苑锡妮石磊蒋浩民
Owner BAOSHAN IRON & STEEL CO LTD
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