The study focuses on the effect of mono and combined addition of metallic and ceramic reinforcement particles on the microstructural and corrosion behavior of surface composites fabricated by friction stir processing. Molybdenum, possessing higher corrosion resistance compared to aluminum, is used as the metallic reinforcement, and boron carbide is used as ceramic reinforcement. Combined addition of boron carbide and molybdenum is used to study the effect of hybrid reinforcement on the corrosion behavior of Al 1050 surface composites. The effect of friction stir processing and reinforcement type on the electrochemical behavior of surface composites is analyzed through potentiodynamic polarization and impedance analysis. Reinforcement particles distributed on the Al matrix through friction stir processing affect the pitting corrosion behavior of surface composites. Post-corrosion microscopy analysis is carried out to understand the effect of the reinforcement particles on the pitting corrosion. The surface composites fabricated are free from any intermetallics. Surface composites with second processing pass showed better corrosion resistance due to more homogeneously distributed finer Mo particles in Al-Mo surface composites. Mono-reinforced surface composites exhibited an increase in the corrosion resistance, whereas the combined addition of reinforcements induced more galvanic effect in the surface composite leading to more severe corrosion.

中文翻译：

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使用搅拌摩擦处理具有金属、陶瓷和混合增强材料的铝表面复合材料的腐蚀行为

该研究的重点是金属和陶瓷增强颗粒的单一和组合添加对搅拌摩擦加工制造的表面复合材料的微观结构和腐蚀行为的影响。与铝相比，钼具有更高的耐腐蚀性，用作金属增强体，碳化硼用作陶瓷增强体。碳化硼和钼的复合添加用于研究混合增强对Al 1050 表面复合材料腐蚀行为的影响。通过动电位极化和阻抗分析，分析了搅拌摩擦处理和增强类型对表面复合材料电化学行为的影响。通过搅拌摩擦处理分布在铝基体上的增强颗粒会影响表面复合材料的点蚀行为。进行腐蚀后显微镜分析以了解增强颗粒对点蚀的影响。制造的表面复合材料不含任何金属间化合物。由于在 Al-Mo 表面复合材料中分布更均匀、更细的 Mo 颗粒，经过二次加工的表面复合材料表现出更好的耐腐蚀性。单增强表面复合材料的耐腐蚀性能提高，而增强材料的组合添加在表面复合材料中引起更多的电偶效应，导致更严重的腐蚀。进行腐蚀后显微镜分析以了解增强颗粒对点蚀的影响。制造的表面复合材料不含任何金属间化合物。由于在 Al-Mo 表面复合材料中分布更均匀、更细的 Mo 颗粒，经过二次加工的表面复合材料表现出更好的耐腐蚀性。单增强表面复合材料的耐腐蚀性能提高，而增强材料的组合添加在表面复合材料中引起更多的电偶效应，导致更严重的腐蚀。进行腐蚀后显微镜分析以了解增强颗粒对点蚀的影响。制造的表面复合材料不含任何金属间化合物。由于在 Al-Mo 表面复合材料中分布更均匀、更细的 Mo 颗粒，经过二次加工的表面复合材料表现出更好的耐腐蚀性。单增强表面复合材料的耐腐蚀性能提高，而增强材料的组合添加在表面复合材料中引起更多的电偶效应，导致更严重的腐蚀。