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    • 5. 发明授权
    • Magnesium alloy structural member
    • 镁合金结构件
    • US09103010B2
    • 2015-08-11
    • US13515155
    • 2010-12-06
    • Osamu MizunoNobuyuki OkudaKoji MoriMasahiro YamakawaMasayuki NishizawaTakayasu Sugihara
    • Osamu MizunoNobuyuki OkudaKoji MoriMasahiro YamakawaMasayuki NishizawaTakayasu Sugihara
    • C22C23/02C22F1/06B22D11/00C23C22/22C23C28/02C23C30/00
    • C22F1/06B22D11/001C22C23/02C23C22/22C23C28/021C23C28/028C23C30/00Y10T428/256
    • A magnesium alloy structural member having excellent corrosion resistance is provided. The magnesium alloy structural member includes a magnesium alloy substrate that contains more than 7.5% by mass of Al and an anticorrosive layer formed on a surface of the substrate by chemical conversion treatment. The substrate contains a precipitate, typically, particles dispersed therein. The particles are made of an intermetallic compound containing at least one of Al and Mg and have an average particle size of 0.05 μm or more and 1 μm or less. The total area of the particles accounts for 1% by area or more and 20% by area or less. The anticorrosive layer includes a lower sublayer and a surface sublayer on the substrate in this order. The surface sublayer is denser than the lower sublayer. The substrate of the magnesium alloy structural member has high corrosion resistance because of a high Al content. The magnesium alloy structural member has excellent corrosion resistance because of the dense sublayer on the front side of the anticorrosive layer, which prevents a corrosive liquid from reaching the substrate. The porous lower sublayer can reduce the tendency of the anticorrosive layer to detach from the substrate, for example, upon impact and allows the magnesium alloy structural member to retain high corrosion resistance.
    • 提供了具有优异耐腐蚀性的镁合金结构件。 镁合金结构件包括含有大于7.5质量%的Al的镁合金基材和通过化学转化处理在基板的表面上形成的防腐蚀层。 底物含有沉淀物,通常分散在其中的颗粒。 颗粒由含有Al和Mg中的至少一种的金属间化合物制成,平均粒径为0.05μm以上且1μm以下。 颗粒总面积占面积的1%以上,面积以下为20%。 防腐层依次包括下层和衬底上的表面子层。 表层子层比下层更致密。 由于Al含量高,所以镁合金构件的基板具有高耐腐蚀性。 镁合金结构件由于在防腐蚀层的正面上的致密子层而具有优异的耐腐蚀性,防止了腐蚀性液体到达基板。 多孔下层可以降低防腐层与基材脱离的倾向,例如在冲击时,镁合金结构件能够保持高的耐腐蚀性。