Aluminum alloy sheet
A technology of aluminum alloy plate and quality, which is applied in the field of aluminum alloy plate, can solve problems such as uncertainty and lack of clear understanding, and achieve the effect of improving resistance to filiform corrosion
Inactive Publication Date: 2017-04-19
KOBE STEEL LTD
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Problems solved by technology
However, the metallurgical properties of the Al-Mg-Si-based aluminum alloy sheet to which Sn is added are different from those of the Al-Mg-Si-based aluminum alloy sheet without Sn added. technology, not yet sure if it actually works
In addition, the problem of improving the filiform corrosion resistance in the Al-Mg-Si-based aluminum alloy sheet to which Sn is actively added has not been clearly recognized.
Method used
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Embodiment
[0092] Next, examples of the present invention will be described. 6000-series aluminum alloy plates having different crystallization states were produced, and mechanical properties and filiform corrosion resistance were investigated and evaluated.
[0093] (manufacturing conditions of board)
[0094] Specifically, 6000-series aluminum alloy ingots with the compositions shown in Table 1 were melted by DC casting, and as shown in Table 2, the average cooling rate during casting was brought from the liquidus temperature to the solidus temperature, and The solidus temperature is varied from 400°C to 400°C and cooled to control the composition and state of crystallization. In addition, in the display of the content of each element in Table 1, the numerical value of each element is displayed as a blank, indicating that the content is below the detection limit, which is 0% not containing these elements.
[0095] Common to each example, these ingots were soaked at 540° C. for 6 hour...
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Abstract
The present invention pertains to an Al-Mg-Si-based aluminum alloy plate comprising, by mass, 0.20-1.50% of Mg, 0.30-2.00% of Si, and 0.005-0.500% of Sn, the balance being Al and unavoidable impurities, wherein the aluminum alloy plate is characterized in having a structure in which, from among all crystallized substances having a circle-equivalent diameter within the range of 0.3-20 [mu]m as measured using a 500X-magnification SEM, crystallized substances containing Sn identified by an X-ray spectrometer have an average number density in the range of 10 per mm2 to 2,000 per mm2, the proportion of the aforementioned average number density of the crystallized substances containing Sn in relation to the average number density of all crystallized substances having the circle-equivalent diameter being within the range of 0.3-20 [mu]m is 70% or above. With this aluminum alloy plate, it is possible to improve filiform corrosion resistance without inhibiting moldability or BH properties after room-temperature aging.
Description
technical field [0001] The present invention relates to an aluminum alloy plate, and particularly relates to an Al—Mg—Si based aluminum alloy plate having excellent filiform corrosion resistance. The aluminum alloy sheet referred to in the present invention refers to a rolled sheet such as a hot-rolled sheet or a cold-rolled sheet, and refers to an aluminum alloy that has been subjected to quenching and tempering such as solution treatment and quenching treatment, and before baking, coating and hardening treatment. plate. In addition, in the following description, aluminum is also called aluminum and Al. Background technique [0002] In recent years, from the perspective of the global environment and the like, there has been an increasing social demand for reducing the weight of vehicles such as automobiles. In order to meet such demands, as a material for large-scale body panel structures (outer panels, inner panels) and reinforcements of automobiles, it replaces steel ma...
Claims
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IPC IPC(8): C22C21/02C22C21/06C22F1/00C22F1/05
CPCC22C21/06C22F1/00C22F1/05C22C21/02C22C21/08C22C28/00C22F1/043C22F1/047C01P2002/70C01P2004/03C01P2004/61
Inventor 小泽敬祐巽明彦高田悟
Owner KOBE STEEL LTD