Han Yu-Mei, Chen X-Grant
Department of Applied Sciences, Université du Québec à Chicoutimi, 555 boul. de l'Université, Saguenay, QC G7H 2B1, Canada.
Materials (Basel). 2015 Sep 21;8(9):6455-6470. doi: 10.3390/ma8095314.
Aluminum based metal matrix composites (MMCs) have received considerable attention in the automotive, aerospace and nuclear industries. One of the main challenges using Al-based MMCs is the influence of the reinforcement particles on the corrosion resistance. In the present study, the corrosion behavior of Al-B₄C MMCs in a 3.5 wt.% NaCl solution were investigated using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques. Results indicated that the corrosion resistance of the composites decreased when increasing the B₄C volume fraction. Al-B₄C composite was susceptible to pitting corrosion and two types of pits were observed on the composite surface. The corrosion mechanism of the composite in the NaCl solution was primarily controlled by oxygen diffusion in the solution. In addition, the galvanic couples that formed between Al matrix and B₄C particles could also be responsible for the lower corrosion resistance of the composites.
铝基金属基复合材料（MMCs）在汽车、航空航天和核工业中受到了广泛关注。使用铝基MMCs的主要挑战之一是增强颗粒对耐腐蚀性的影响。在本研究中，采用动电位极化（PDP）和电化学阻抗谱（EIS）技术研究了Al-B₄C MMCs在3.5 wt.% NaCl溶液中的腐蚀行为。结果表明，随着B₄C体积分数的增加，复合材料的耐腐蚀性降低。Al-B₄C复合材料易发生点蚀，在复合材料表面观察到两种类型的点蚀。复合材料在NaCl溶液中的腐蚀机理主要受溶液中氧扩散的控制。此外，Al基体与B₄C颗粒之间形成的电偶也可能是复合材料耐腐蚀性较低的原因。
