Purpose

This study aims to investigate the corrosion behavior of stir-cast hybrid aluminum composite reinforced with CeO₂ and graphene nanoplatelets (GNPs) nanoparticulates used as cylinder liner material in the engines (automotive, aerospace and aircraft industries).

Design/methodology/approach

The composites were prepared using the stir-casting technique, and their microstructure and corrosion behavior was evaluated using scanning electron microscopy (SEM) and potentiodynamic polarization test, respectively.

Findings

The results showed that the addition of CeO₂ and GNPs improved the corrosion resistance of the composites, and the optimal combination of these two nanoparticles was found to be 3 wt.% CeO₂ and 3 wt.% GNPs. The enhanced corrosion resistance was attributed to the formation of a protective layer on the surface of the composite, as well as the effective dispersion and uniform distribution of nanoparticles in the matrix. The 0.031362 was noted as the lowest corrosion rate (mmpy) and was noticed in 94% Al-6061 alloy + (3 Wt.% CeO₂ + 3 Wt.% GNPs) sample at room temperature and at elevated temperatures; the corrosion rate (mmpy) was observed as 0.0601 and 0.0636 at 45 °C and 75 °C, respectively.

Originality/value

In the vast majority of the published research publications, either cerium oxide or graphene nanoplatelets were utilized as a single reinforcement or in conjunction with other types of reinforcement such as alumina, silicon carbide, carbon nano-tubes, tungsten carbide, etc., but on the combination of the CeO₂ and GNPs as reinforcements have very less literatures with 2 wt.% each only. The prepared hybrid aluminum composite (reinforcing 1 wt.% to 3 wt.% in Al-6061 alloy) was considered for replacing the cylinder liner material in the piston-cylinder arrangement of engines.

中文翻译：

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增强 CeO2 和 GNPs 纳米颗粒的搅拌铸造混合铝复合材料的协同腐蚀防护

目的

本研究旨在研究用作发动机（汽车、航空航天和飞机工业）气缸套材料的CeO _{2和石墨烯纳米片 (GNP) 纳米颗粒增强的搅拌铸造混合铝复合材料的腐蚀行为。}

设计/方法论/途径

采用搅拌铸造技术制备复合材料，并分别使用扫描电子显微镜（SEM）和动电位极化测试评估其微观结构和腐蚀行为。

发现

_{结果表明，CeO 2}和GNPs的添加提高了复合材料的耐腐蚀性能，并且发现这两种纳米颗粒的最佳组合为3 wt.% CeO ₂和3 wt.% GNPs。耐腐蚀性能的增强归因于复合材料表面保护层的形成，以及纳米粒子在基体中的有效分散和均匀分布。 0.031362 被认为是最低的腐蚀速率 (mmpy)，并且在室温和高温下的94% Al-6061 合金 + (3 Wt.% CeO ₂ + 3 Wt.% GNPs) 样品中注意到；45 °C 和 75 °C 时的腐蚀速率 (mmpy) 分别为 0.0601 和 0.0636。

原创性/价值

在绝大多数已发表的研究出版物中，氧化铈或石墨烯纳米片都被用作单一增强材料或与其他类型的增强材料（例如氧化铝、碳化硅、碳纳米管、碳化钨等）结合使用，但CeO ₂和GNPs的组合作为增强体的文献非常少，各只有2 wt.%。所制备的混合铝复合材料（在 Al-6061 合金中增强 1 wt.% 至 3 wt.%）被考虑用于替代发动机活塞-气缸布置中的气缸套材料。