Effects of manufacturing parameters on the electrochemical properties of aluminum-based nanocomposite with clay reinforcement have been investigated as a new study. Tafel polarization and electrochemical impedance spectroscopy tests at ambient temperature and in two corrosive environments were used to investigate the characteristics of the fabricated nanocomposites. Examination of different specimen microstructures was performed by optical and scanning electron microscopy before and after electrochemical tests. Electrochemical measurements indicated that nanocomposites had a higher corrosion rate in 0.6 M NaCl solution compared to the Al-Si-Cu matrix. The lower content of the Si and AlCu precipitates was a major parameter in reducing corrosion attacks. However, nanocomposites exhibited a higher corrosion resistance in comparison with the aluminum matrix in 0.02 M HBO solution. Such an increase range was about 25.3–70.3 % concerning nanocomposites. The highest resistance was attributed to the nanocomposite stirred for 2 mins at 800 °C. In this situation, a higher content of Si precipitates (up to 30 %) with a small size was an effective factor in forming a passive layer at the matrix surface and acting as an obstacle for further corrosive ions diffusion toward the inner layer of the material.

中文翻译：

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Al-Si-Cu/粘土纳米复合材料在两种腐蚀溶液中的微观结构和电化学特性评价

作为一项新的研究，研究了制造参数对粘土增强铝基纳米复合材料电化学性能的影响。使用环境温度和两种腐蚀环境下的塔菲尔偏振和电化学阻抗谱测试来研究所制造的纳米复合材料的特性。在电化学测试之前和之后通过光学和扫描电子显微镜检查不同样品的微观结构。电化学测量表明，与 Al-Si-Cu 基体相比，纳米复合材料在 0.6 M NaCl 溶液中具有更高的腐蚀速率。较低含量的 Si 和 AlCu 沉淀物是减少腐蚀的主要参数。然而，与铝基体相比，纳米复合材料在0.02 M HBO溶液中表现出更高的耐腐蚀性。对于纳米复合材料来说，这种增加范围约为 25.3-70.3%。最高的电阻归因于纳米复合材料在 800 °C 下搅拌 2 分钟。在这种情况下，较高含量的小尺寸Si析出物（高达30%）是在基体表面形成钝化层并阻碍腐蚀离子进一步向材料内层扩散的有效因素。