(1. School of Metallurgy and Materials Engineering, College of Engineering,
University of Tehran, P. O. Box 11155-4563, Tehran, Iran;
2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada)
摘 要: 納米復(fù)合材料的腐蝕、腐蝕磨損以及干摩擦磨損行為非常復(fù)雜，受化學、物理和機械等多方面因素影響。采用機械球磨、冷壓和熱擠壓技術(shù)制備Al/SiC納米復(fù)合材料，研究納米SiC含量對材料硬度、干滑動磨損、腐蝕和腐蝕磨損行為的影響。采用電化學極化測試研究了復(fù)合材料在3% NaCl溶液中的抗腐蝕性能。采用盤-銷裝置研究了復(fù)合材料的干滑動磨損和在3% NaCl溶液中腐蝕磨損性能。利用掃描電子顯微鏡研究了材料及磨損表面的顯微組織。結(jié)果表明，隨著SiC含量的增加，納米復(fù)合材料的干滑動摩擦和抗腐蝕性能均得到提高。由于溶液的潤滑作用，使材料軟化的摩擦因數(shù)和摩擦生熱均降低。與基體合金相比，納米復(fù)合材料的強度和抗腐蝕性能提高，因此其抗腐蝕磨損性能也提高。對于未增強的基體合金，其磨損機理為黏著磨損，而對于Al/SiC納米復(fù)合材料，磨損機理轉(zhuǎn)變?yōu)槟チＤp。
關(guān)鍵字: 6061鋁合金；碳化硅；納米復(fù)合材料；機械球磨；腐蝕；干摩擦磨損；腐蝕磨損
（1. School of Metallurgy and Materials Engineering, College of Engineering,
University of Tehran, P. O. Box 11155-4563, Tehran, Iran;
2. Department of Chemical and Materials Engineering, University of Alberta, Edmonton, Alberta T6G 2V4, Canada）
Abstract:The corrosion, corrosive wear and dry sliding wear of nanocomposites, are extremely complicated and involve various chemical, physical and mechanical factors. The aim of this work is to investigate the effects of nanosized SiC content on the hardness, dry sliding wear, corrosion and corrosive wear of Al/SiC nanocomposites synthesized by mechanical milling cold pressing and hot extrusion. The corrosion resistance of these composites in 3% NaCl solution was investigated by electrochemical polarization testing and their dry sliding as well as corrosive wear resistance in the same solution was evaluated using a pin-on-disc tester. The microstructures of the samples and their worn surfaces were examined using scanning electron microscopy. It was shown that the dry sliding wear and corrosion resistance of these nanocomposites were improved with the increase of SiC content. It was concluded that due to the lubrication effect of the solution, both the friction coefficient and frictional heat that might soften the material were reduced. In addition, the improved strength of the nanocomposites combined with their better corrosion resistance contributed to their increased corrosive wear resistance, compared with the base alloy. The prominent wear mechanism in the unreinforced alloy was adhesive wear, in the Al/SiC nanocomposites, the wear mechanism changed to abrasive.
Key words: Al 6061; SiC; nanocomposite; mechanical milling; corrosion; dry sliding wear; corrosive wear
