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ALUMINUM ALLOY MATERIAL HAVING EXCELLENT CORROSION RESISTANCE AND STRENGTH, AND METHOD FOR PRODUCING SAME NEW_EN meetings

Foreign code F190009954
File No. (17-17)
Posted date Oct 25, 2019
Country WIPO
International application number 2018JP024880
International publication number WO 2019163155
Date of international filing Jun 29, 2018
Date of international publication Aug 29, 2019
Priority data
  • P2018-028363 (Feb 21, 2018) JP
Title ALUMINUM ALLOY MATERIAL HAVING EXCELLENT CORROSION RESISTANCE AND STRENGTH, AND METHOD FOR PRODUCING SAME NEW_EN meetings
Abstract The present invention relates to an aluminum alloy material comprising: a base material made from an aluminum alloy containing at least one solute element; and a coating film formed on at least one surface of the base material and containing aluminum oxide hydroxide (AlO(OH)). In a profile obtained by the X-ray diffraction from the coating film side of the aluminum alloy material of the present invention, n diffraction peaks coming from at least one compound containing the solute element and one diffraction peak coming from aluminum oxide hydroxide are observed, and at least one diffraction peak coming from a compound which satisfies the requirement represented by the formula: 1.4 ≤ Xn/S is also observed, wherein Xn represents the peak intensity of each of the n diffraction peaks coming from the above-mentioned compound and S represents the peak intensity of the diffraction peak of aluminum oxide hydroxide.
Outline of related art and contending technology BACKGROUND ART
An aluminum-aluminum alloy, and are lighter than steel material, as compared with organic materials such as resin on a high stiffness, such as recyclable in a number of advantages. Therefore, in recent years, a steel material such as a vehicle or aircraft to an alternative configuration of the means of transport are also often used as a material.
For a relatively low melting point aluminum alloy, and the usage environment of the applications described above can be said that the high temperature environment. Therefore, corrosion due to oxidation of the surface of the aluminum alloy material are concerned. Aluminum is left in the air and a natural oxide film is generated by passivation, the thickness of the natural oxide film because of a few nanometers, extreme moisture, or an acid or alkali in an environment prone to corrosion. Therefore, conventionally, in order to improve the corrosion resistance of the aluminum alloy of the surface treatment method has been studied. At present, depending on the use environment, the alumite treatment, and plating processing in addition to the boehmite treatment, a phosphoric acid chromate treatment, chromate treatment with chromic acid, and zinc phosphate treatment, chromate treatment and non-chemical conversion treatment has been known. In these various chemical conversion treatment, acid or alkali such as H2SO4, the treatment liquid containing ions of heavy metals such as Cr, the workpiece is brought into contact with the aluminum alloy, the alloy was immersed in a surface to form a sacrificial film.
The above-mentioned surface treatment techniques such as chemical treatment or the like in the, or a waste liquid processing of the specific procurement of the processing solution for the problem of an increase in cost and the problem that the load on the environment. Therefore, more efficiently than the above-described chemical conversion treatment of the environmental load is smaller as the surface treatment method, the surface of the water vapor is applied to a signal processing technique is drawing attention (Patent Document 1). Also the present inventors, in order to improve the corrosion resistance of the aluminum alloy material, the predetermined temperature range of water vapor into contact with the surface of the alloy to the surface of the processing method are disclosed. Such aluminum alloy material in a water vapor treatment, the surface of the aluminum hydroxide oxide (AlO (OH) ) film is formed as a main component, the corrosion resistance is improved by the action of the anticorrosive coating film.
In addition, the present inventors in Patent Document 2 by a steam treatment of the aluminum alloy material, in addition to improved corrosion resistance by the film formation, the substrate can improve the strength of the aluminum alloy can be confirmed. In a steam treatment, the temperature and pressure of water vapor in contact with the substrate can be optimized, the base material composed of solute elements contained in the aluminum alloy precipitates by adjusting the grain size distribution, thereby improving the strength of the substrate.
Scope of claims (In Japanese)[請求項1]
 少なくとも1種の溶質元素を含むアルミニウム合金からなる基材と、前記基材の少なくとも一つの面上に形成された皮膜と、からなるアルミニウム合金材であって、
 前記皮膜は、水酸化酸化アルミニウム(AlO(OH))を含むものであり、
 アルミニウム合金材を皮膜の上からX線回折したときのプロファイルにおいて、前記溶質元素を含む少なくとも1種の化合物の回折ピークがn本と、2θ=14°~15°の範囲に現れる水酸化酸化アルミニウムの回折ピークが1本観察されており、
 前記化合物のn本の回折ピークのピーク強度をそれぞれXn(n=1、2、3・・・)とし、2θ=14°~15°の範囲に現れる前記水酸化酸化アルミニウムの回折ピークのピーク強度をSとしたとき、1.4≦Xn/Sとなるような化合物の回折ピークが少なくとも1つ観察されることを特徴とするアルミニウム合金材。

[請求項2]
 溶質元素は、亜鉛(Zn)、マグネシウム(Mg)、ケイ素(Si)、銅(Cu)、マンガン(Mn)、リチウム(Li)、鉄(Fe)、ニッケル(Ni)、銀(Ag)、ジルコニウム(Zr)、クロム(Cr)の少なくともいずれかである請求項1記載のアルミニウム合金材。

[請求項3]
 皮膜の厚さは、0.05~100μmである請求項1又は請求項2記載のアルミニウム合金材。

[請求項4]
 請求項1~請求項3のいずれかに記載のアルミニウム合金材の製造方法であって、
少なくとも1種の溶質元素を含むアルミニウム合金からなる基材を、450℃~570℃に加熱し冷却して溶体化した後、
前記溶体化した基材を50℃~300℃で0.1時間~168時間加熱する組織制御処理を行い、
前記組織制御処理後の基材を温度100℃~350℃の水蒸気と接触させ、前記基材上に皮膜を形成する工程を含むアルミニウム合金材の製造方法。
  • Applicant
  • ※All designated countries except for US in the data before July 2012
  • SHIBAURA INSTITUTE OF TECHNOLOGY
  • Inventor
  • SERIZAWA Ai
  • ISHIZAKI Takahiro
IPC(International Patent Classification)
Specified countries National States: AE AG AL AM AO AT AU AZ BA BB BG BH BN BR BW BY BZ CA CH CL CN CO CR CU CZ DE DJ DK DM DO DZ EC EE EG ES FI GB GD GE GH GM GT HN HR HU ID IL IN IR IS JO JP KE KG KH KN KP KR KW KZ LA LC LK LR LS LU LY MA MD ME MG MK MN MW MX MY MZ NA NG NI NO NZ OM PA PE PG PH PL PT QA RO RS RU RW SA SC SD SE SG SK SL SM ST SV SY TH TJ TM TN TR TT TZ UA UG US UZ VC VN ZA ZM ZW
ARIPO: BW GH GM KE LR LS MW MZ NA RW SD SL SZ TZ UG ZM ZW
EAPO: AM AZ BY KG KZ RU TJ TM
EPO: AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR
OAPI: BF BJ CF CG CI CM GA GN GQ GW KM ML MR NE SN ST TD TG

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