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MarketScreener Homepage  >  Equities  >  Tokyo  >  UACJ Corp    5741   JP3826900007

UACJ CORP

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Patent Issued for Aluminum Alloy Sheet That Exhibits Excellent Surface Quality After Anodizing And Method For Producing The Same (USPTO 10,364,485): UACJ Corporation

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08/14/2019 | 05:50pm EDT

2019 AUG 14 (NewsRx) -- By a News Reporter-Staff News Editor at Entertainment Business Daily -- According to news reporting originating from Alexandria, Virginia, by NewsRx journalists, a patent by the inventors Asano, Mineo (Tokyo, Japan); Yamamoto, Yusuke (Tokyo, Japan), filed on June 28, 2013, was published online on August 12, 2019.

The assignee for this patent, patent number 10,364,485, is UACJ Corporation (Chiyoda-ku, Tokyo OT, Japan).

Reporters obtained the following quote from the background information supplied by the inventors: “The invention relates to an aluminum alloy sheet that exhibits an excellent surface quality after anodizing without showing a band-like streak pattern, and a method for producing the same.

“In recent years, an aluminum alloy sheet has been increasingly applied to automotive interior parts and outer panels for consumer electronics. These products are required to exhibit an excellent surface quality, and are often used in an anodized state. However, an outer panel for consumer electronics may show a streak pattern after anodizing, for example. Therefore, an aluminum alloy sheet that does not show a streak pattern after anodizing has been desired.

“Various attempts have been made to prevent such a streak pattern, and methods that control the chemical components, the crystal grain size of the final sheet, the dimensions and the distribution density of precipitates, or the like have been proposed. However, a streak pattern may not be sufficiently prevented by these methods.

“JP-A-2000-273563 and JP-A-2006-52436 disclose related-art technology.”

In addition to obtaining background information on this patent, NewsRx editors also obtained the inventors’ summary information for this patent: “The inventors of the invention found that the occurrence of a band-like streak pattern after anodizing is affected by an element (peritectic element) that undergoes a peritectic reaction with aluminum and is present in a solid-solution state, and proposed a method that controls the state of the peritectic element. However, it was found that a streak pattern may occur even when the above method is employed.

“The inventors conducted further tests and studies, and found that the state of Mg that is present in a solid-solution state in an aluminum alloy that includes Mg that undergoes a eutectic reaction with aluminum affects the occurrence of a band-like streak pattern after anodizing. The invention was conceived based on the above finding. An object of the invention is to provide an aluminum alloy sheet that exhibits an excellent surface quality after anodizing without showing a band-like streak pattern, and a method for producing the same.

“According to a first aspect of the invention, an aluminum alloy sheet that exhibits an excellent surface quality after anodizing is a 5000 series aluminum alloy sheet that includes 1.0 to 6.0 mass % of Mg, and requires an anodic oxide coating, a concentration of Mg in a solid-solution state that is present in an outermost surface area of the aluminum alloy sheet varying in a widthwise direction of the aluminum alloy sheet in a form of a band having a width of 0.05 mm or more, and a difference in the concentration of Mg between adjacent bands being 0.20 mass % or less. Note that the unit ‘mass %’ may be hereinafter referred to as ‘%’.

“The aluminum alloy sheet may include 1.0 to 6.0 mass % of Mg, and one or two or more elements among 0.001 to 0.1 mass % of Ti, 0.4 mass % or less of Cr, 0.5 mass % or less of Cu, 0.5 mass % or less of Mn, 0.4 mass % or less of Fe, and 0.3 mass % or less of Si, with the balance being Al and unavoidable impurities.

“According to a second aspect of the invention, a method for producing the aluminum alloy sheet according to the first aspect of the invention includes subjecting an ingot to hot rolling and cold rolling to produce an aluminum alloy sheet, a rolling target side of the ingot having a structure in which a difference in the concentration of Mg between an area having a diameter of 5 .mu.m and positioned in a center area of a crystal grain and an area having a diameter of 5 .mu.m and positioned away from a grain boundary of the crystal grain by 2.5 .mu.m is 0.80 mass % or less.

“The aspects of the invention may thus provide an aluminum alloy sheet that exhibits an excellent surface quality after anodizing without showing a band-like streak pattern, and a method for producing the same.”

The claims supplied by the inventors are:

“What is claimed is:

“1. An aluminum alloy sheet comprising a 5000 series aluminum alloy sheet containing 1.0-6.0 mass % of Mg, the Mg concentration in a solid-solution state that is present in an outermost surface area of the aluminum alloy sheet varying in a widthwise direction of the aluminum alloy sheet in the form of a band having a width of a least 0.05 mm and a difference in the concentration of Mg between adjacent bands is no more than 0.20 mass %, and an oxide coating provided thereon.

“2. The aluminum alloy sheet according to claim 1, comprising 1.0 to 6.0 mass % of Mg, and one or more elements selected from 0.001 to 0.1 mass % of Ti, 0.4 mass % or less of Cr, 0.5 mass % or less of Cu, 0.5 mass % or less of Mn, 0.4 mass % or less of Fe, and 0.3 mass % or less of Si, with the balance being Al and unavoidable impurities.

“3. A method for producing the aluminum alloy sheet according to claim 1, the method comprising subjecting an ingot to hot rolling and cold rolling to produce an aluminum alloy sheet, a rolling target side of the ingot having a structure in which a difference in concentration of Mg between an area having a diameter of 5 .mu.m and positioned in a center area of a crystal grain and an area having a diameter of 5 .mu.m and positioned away from a grain boundary of the crystal grain by 2.5 .mu.m is 0.80 mass % or less.”

For more information, see this patent: Asano, Mineo; Yamamoto, Yusuke. Aluminum Alloy Sheet That Exhibits Excellent Surface Quality After Anodizing And Method For Producing The Same. U.S. Patent Number 10,364,485, filed June 28, 2013, and published online on August 12, 2019. Patent URL: http://patft.uspto.gov/netacgi/nph-Parser?Sect1=PTO1&Sect2=HITOFF&d=PALL&p=1&u=%2Fnetahtml%2FPTO%2Fsrchnum.htm&r=1&f=G&l=50&s1=10,364,485.PN.&OS=PN/10,364,485RS=PN/10,364,485

(Our reports deliver fact-based news of research and discoveries from around the world.)

Copyright © 2019 NewsRx LLC, Entertainment Business Daily, source Leisure, Travel & Entertainment Newsletters

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Sales 2020 654 B
EBIT 2020 15 774 M
Net income 2020 3 533 M
Debt 2020 353 B
Yield 2020 1,97%
P/E ratio 2020 20,7x
P/E ratio 2021 8,05x
EV / Sales2020 0,65x
EV / Sales2021 0,61x
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