Dendritic structure formation of magnesium alloys for the manipulation of corrosion properties: Part 2 – corrosion
Dendritic structure formation of magnesium alloys for the manipulation of corrosion properties: Part 2 – corrosion
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DOI：
10.3139/146.111790
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发表时间：
2019-08
影响因子：
0.8
通讯作者：
Piotr Łakoma;A. Ditze;C. Scharf
中科院分区：
文献类型：
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作者：
Piotr Łakoma;A. Ditze;C. Scharf
摘要 在纯镁和含铝镁合金中，显微组织对腐蚀性能也起着重要作用。在第 1 部分中，通过在不同冷却速率下铸造含 0、3、6、9 和 12% 铝（所有成分均为质量百分比）的样品来测定晶粒尺寸、二次枝晶臂间距 (SDAS) 和 β 相析出物。通过浸泡和盐雾测试来测试这些样品的腐蚀性能。腐蚀过程的建模能够在合金的微观结构和腐蚀特性之间建立数学联系。结果表明，腐蚀速率随着铝含量和冷却速率的增加而增加。晶界处的析出对镁铝合金的腐蚀性能有一定的影响。使用盐雾测试的随机比较往往会证实结果。
Abstract In pure magnesium and aluminum-containing magnesium alloys, the microstructure also plays a role in the corrosion properties. In Part 1, the grain sizes, secondary dendrite arm spacings (SDAS) and precipitates of β phase were determined by casting samples with 0, 3, 6, 9 and 12 % aluminum (all compositions in mass percentage) at different cooling rates. These samples were tested for corrosion properties by immersion and salt spray tests. The modeling of the corrosion process enables establishing a mathematical link between the microstructure and corrosion properties of an alloy. The results show an increase in the corrosion rate with increasing aluminum contents and the cooling rate. The precipitations at the grain boundaries have a relevant impact on corrosion properties of the magnesium–aluminum alloys. A random comparison using the salt spray test tends to confirm the results.