Abstract This investigation is focused on the corrosion evaluation of an as-cast Al-7.5 wt% Si alloy and an Al/7.5 wt% Si composite immersed into distinctive biofuels. Immersions up to ~6000 h into three distinctive fuels are evaluated. A biodiesel B100, a mixture 1:1 between biodiesel and commercial diesel (B50); and mixture among biodiesel, diesel and commercial bioethanol (BDE blend) are considered. A novelty concerns to the adopted manufacturing route for the composite sample preparation is proposed. Commercial pure Al powders and pure Si particles are used. This provides different resulting microstructural arrays and consequently the distinct cathode-to-anode area ratios are also provided. It is found that into all biofuels examined, the Al/Si composite has lower corrosion susceptibility than the as-cast sample. Also, it is also found that the composite sample has a decreased corrosion behavior with increasing the water content. On the other hand, the as-cast sample shows a higher corrosion rate than the as-cast sample.

中文翻译：

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浸入生物柴油和混合物中的铝硅铸件和烧结铝/硅复合材料的腐蚀行为

摘要 本研究的重点是浸入独特生物燃料中的铸态 Al-7.5 wt% Si 合金和 Al/7.5 wt% Si 复合材料的腐蚀评估。评估了在三种不同燃料中浸泡长达约 6000 小时的情况。生物柴油 B100，生物柴油和商业柴油 (B50) 1:1 的混合物；以及生物柴油、柴油和商业生物乙醇（BDE 混合物）之间的混合物。提出了对复合样品制备所采用的制造路线的新颖性关注。使用商业纯铝粉和纯硅颗粒。这提供了不同的结果微结构阵列，因此还提供了不同的阴极-阳极面积比。发现在所有检测的生物燃料中，Al/Si 复合材料的腐蚀敏感性低于铸态样品。还，还发现复合样品的腐蚀行为随着含水量的增加而降低。另一方面，铸态样品显示出比铸态样品更高的腐蚀速率。