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.
The mechanical properties and the corrosion mechanism of SiCp/2A50 composite materials were studied.The specimens were prepared by the liquid forging.The SiCp particles were added into a partially solidified matrix alloy.The experimental results show that the strength of SiCp/2A50 composite increases with increasing of the SiCp volume fraction,and the ductility of SiCp/2A50 composite decreases with increasing particulates size.The pitting potentials of 2A50 and SiCp/2A50 composite materials are similar.The corrosion resistance of SiCp/2A50 of the pit initiation is almost the same as that of the matrix alloy.It has been found that once pits initiate,the pitting corrosion damage is accelerated owing to the formation of crevices between the reinforcement and the matrix.The cathodic current of the SiCp/2A50 is slightly larger than that of the matrix alloy.The SiCp markedly decreases the pitting corrosion resistance of the composite and the matrix alloy in chloride containing environment.SiCp accelerates the corrosion rate of composite materials,namely the corrosion velocity of composite materials is greater than that of the aluminum alloys.
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