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Correlation Between Unsteady-State Solidification and Electrochemical Corrosion Parameters of an AlSiMg Alloy
International Journal of Metalcasting ( IF 2.6 ) Pub Date : 2021-03-02 , DOI: 10.1007/s40962-021-00571-1
Carolina R. Barbosa , Teyla C. Silva , Hugo M. Azevedo , José C. Filho , Antonio L. Moreira , Otávio L. Rocha

Electrochemical corrosion tests were performed on samples of horizontally solidified Al7Si0.3Mg (wt%) alloy. The investigated solidification and corrosion parameters were growth and cooling rates (VL and TR, respectively), secondary dendritic spacing (λ2), corrosion potential, and corrosion current (ECORR and iCORR, respectively). Optical and scanning electron microscopy analysis were carried out on the samples, and typical solidification microstructure was characterized by primary and eutectic phases (Alα and Alα-eutectic+ Si+ π-Al8Mg3FeSi6+θ-Mg2Si, respectively). The results depicted a higher corrosion resistance in as-cast samples with finer dendritic microstructure, that is, for higher and lower VL/TR and λ2 values, respectively. A mathematical expression characterized the iCORR variation with VL, TR, and λ2. SEM/EDS element maps and point microanalysis showed a strong decreased of Mg and Fe elements within the interdendritic regions due to the corrosion of π and θ intermetallic phases. It was allowed to conclude that Si particles exhibit cathodic behavior in relation to the matrix as well as π and θ intermetallic compounds. A comparative analysis with the literature was also conducted.

Graphic Abstract



中文翻译:

AlSiMg合金非稳态凝固与电化学腐蚀参数的相关性

对水平凝固的Al7Si0.3Mg(wt%)合金样品进行电化学腐蚀测试。所研究的凝固和腐蚀参数是生长和冷却速率(V大号Ť - [R ,分别地),仲树突间距(λ 2),腐蚀电位,腐蚀电流(E CORR和我CORR,分别地)。对样品进行了光学和扫描电子显微镜分析,典型的凝固组织由初生和共晶相(Alα和Alα共晶+ Si + π- Al 8 Mg 3 FeSi 6)表征。+ θ -Mg 2的Si,分别地)。结果描绘为铸态样品中更高的耐腐蚀性更精细枝晶组织,即,用于更高和更低的V大号/ Ť - [R和λ 2个分别值。数学表达式,其特征在于所述I CORR,变异V大号Ť - [R,λ 2。SEM / EDS元素图和点微分析显示,由于πθ的腐蚀,枝晶间区域中的Mg和Fe元素大量减少金属间相。可以得出结论,相对于基体以及πθ金属间化合物,Si颗粒表现出阴极行为。还对文献进行了比较分析。

图形摘要

更新日期:2021-03-03
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