Aluminum alloy board, assembly and member for automobile using the aluminum board

Abstract

The present invention provides an aluminum alloy board that has a permanent sticking performance by which interfacial peeling of a bonding interface of an adhesive is hard to generate even under hot and wet environment, and the invention provides an assembly and a member for automobile using the aluminum board. The aluminum alloy board has an aluminum alloy baseplate (1),and a surface oxide film (2) formed on the surface of the aluminum alloy baseplate (1), wherein the aluminum alloy baseplate contains Mg and Cu, the ratio between Mg and Cu (Mg/Cu (weight percentage)) is under 50; the surface oxide film (2) contains Zr and Cu, and the ratio between Zr and Cu (Zr /Cu (atom percentage)) is above 0.02.

Description

technical field [0001] The present invention relates to an aluminum alloy sheet for use in vehicles such as automobiles, ships, and airplanes, and in particular, an aluminum alloy sheet suitable for an automobile panel, a bonded body using the same, and an automobile member. Background technique [0002] Conventionally, various aluminum alloy sheets are commonly used as members of transportation machines such as automobiles, ships, and airplanes according to the characteristics of each alloy. Especially in recent years it has been realized that CO 2 Due to global environmental problems such as emissions, it is required to improve fuel efficiency by reducing the weight of components, and the specific gravity is about 1 / 3 that of iron, and the use of aluminum alloy plates with excellent energy absorption is increasing. [0003] For example, examples of aluminum alloy sheets used in automotive components include Mg-containing aluminum alloy sheets such as JIS 5000-series Al-Mg...

AI Technical Summary

Problems solved by technology

However, when exposed to a degraded environment such as a high temperature and humid environment in which moisture, oxygen, chloride ions, etc. permeate, copper as an alloy component concentrates on the surface where the oxide film is removed, and the deterioration of the adhesive layer is accelerated by the action of the copper. The phenomenon known as copper damage occurs

As a result, moisture or the like may permeate into the base (substrate) of the aluminum alloy plate, the interface may deteriorate, interface peeling may occur, and the bonding strength may decrease.

[0011] In addition, in the method of anodizing, in order to prevent the deterioration and peeling of the interface,

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