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在研究2A50及SiCp/2A50复合材料力学性能的基础上,采用失重方法和电化学方法研究了2A50及SiCp/2A50复合材料在NaCl溶液中腐蚀行为和腐蚀机理,研究了不同尺寸、不同含量的增强颗粒SiCp对复合材料力学性能和腐蚀行为影响的变化规律。研究结果表明:当增强颗粒SiCp尺寸一定时,随着增强颗粒含量的增加,复合材料的强度增加,延伸率降低,而复合材料的腐蚀速率增加;当增强颗粒SiCp含量一定时,随着增强颗粒尺寸的增加,复合材料的强度降低,而延伸率则降幅较小,复合材料的腐蚀速率增加;复合材料中增强颗粒SiCp含量的变化并没有影响材料的腐蚀电位的变化,且与基体合金的腐蚀电位变化幅度较小;合金中的第二相与增强颗粒SiCp在复试过程中作为腐蚀阴极相,共同增加了合金的腐蚀速率;增强颗粒SiCp的加入降低了合金的耐蚀性能,且所研究的5种复合材料的腐蚀速率均大于基体合金的腐蚀速率。
Based on the investigation of the mechanical properties of 2A50 and SiCp / 2A50 composites, the corrosion behavior and corrosion mechanism of 2A50 and SiCp / 2A50 composites in NaCl solution were investigated by weight loss and electrochemical methods. The effects of different sizes and contents of reinforcement Effect of Particle SiCp on Mechanical Properties and Corrosion Behavior of Composite Materials. The results show that with the increase of SiCp content, the strength of the composite increases and the elongation decreases, while the corrosion rate of the composite increases. When the SiCp content of the reinforced particles is constant, As the size increases, the strength of the composites decreases, while the elongation decreases slightly and the corrosion rate of the composites increases. The changes of the SiCp content in the composites do not affect the corrosion potential of the composites, The second phase of the alloy and the reinforced particles SiCp as the corrosion cathode phase in the re-test process together to increase the corrosion rate of the alloy; the addition of enhanced SiCp reduced the corrosion resistance of the alloy, and the study of the The corrosion rates of the five composite materials are all higher than the corrosion rate of the matrix alloy.