铝及铝合金的耐腐蚀性研究英文..docx

河南工程学院《专业英语》考查课专业论文Corrosion resistance of aluminum andaluminum alloys2015 年 11 月 15 日Corrosion resistance of aluminum andaluminum alloysYanghanDepartment of College of Mechanical EngineeringHenan Institute of Engineering605564494@.comAbstract：The failure caused by the corrosion-wear of molten aluminum and its alloys is one of the main problems in aluminum industry. In this work, the resistance behavior of various materials, including Fe-based alloys, ceramics and corresponding high apparatus of corrosion-wear in molten aluminum and its alloys, were reviewed. The synergistic effect of corrosion and wear was discussed based on corrosion and wear mechanics. The effects of dynamic agitation due to rotating of friction pairs, physical property of liquid metal and size of grain etc., on the corrosion-wear resistance performance were investigated. In addition, the characteristics of corrosion-wear resistance performance of materials in molten aluminum and its alloy were summarized. According to our recent progress referred to kinds of materials, especially a TiAl3/Ti3AlC2/Al2O3 composite, the ceramics/metal composites with a co-continuous structure will be of great advantage in the field of corrosion-wear environment of molten aluminum and its alloys.Key Words： molten aluminum; aluminum alloy; corrosion; wear; synergistic effect1 IntroductionCorrosion-wear is one of the extreme states present in engineering process. Different from corrosion-wear in aqueous media which have been found primarily based on an electro-chemical process, the corrosion-wear in molten metal involves not only the corrosion caused by the high temperature molten metal, but also the synergistic effect between corrosion and wear, which results in much greater material losses than the simple sum of losses by either process alone. It is in fact a kind of mechanical−physical−chemical process that involves dissolution, diffusion, reactions in solid and liquid, wear and interaction among them.The changes in microstructure surface morphology, and composition of the interface between solid and liquid during this process degrade the physical and mechanical properties of the structure materials sharply . Molten aluminum and its alloys are one of the most aggressive metal melts due to their high chemical activity with nearly all metals and metal oxides . Therefore, the solid contamination and system failure resulting from corrosion-wear of molten aluminum are unavoidable in the aluminum[1].2 Aluminum and Aluminum alloysAluminum is a white light metal. Have ductility. Products are often made of rod, sheet, foil, powder, ribbon and filamentous. A layer of oxide film that prevents metal corrosion in wet air. The content of aluminum in the earth's crust is third only to oxygen and silicon, and it is the most abundant metal element in the earth's crust. The development of three major industries of aviation, construction, and automobile requires that the characteristics of materials have unique properties of aluminum and its alloys, which is greatly beneficial to the production and application of this new metal aluminum. Application is very extensive.2.1 The Category(1) Wrought aluminum alloyHigh strength, large specific strength and suitable for plastic forming of aluminum alloy[2].Deformation of aluminum alloy is also divided into:①industrial pure aluminum②heat treated aluminum alloy③heat treated aluminum alloy(2) Cast aluminum alloyThe aluminum alloy which is suitable for filling the mold to obtain a certain shape and size of the casting blank.Casting aluminum alloy:①Al Si Alloys②Al Cu alloy③Al Mg alloy④Aluminum zinc alloy2.2 The GradeSee sheet 1 for details.Sheet1.The Grade of Aluminum and Aluminum alloysGroupBrand SeriesPure aluminum1XXXAluminum alloy with copper as the main alloying element2XXXAluminum alloy with manganese as the main alloying element3XXXAluminum alloy with silicon as the main alloying element4XXXAluminum alloy with magnesium as the main alloying element5XXXMagnesium and silicon as the main alloying elements and Mg2Si phase as the strengthening phase of the aluminum alloy6XXXAluminium alloy with zinc as the main alloying element7XXXAluminum alloy with other alloy elements as the main alloying elements8XXXSpare alloy group9XXX3 Anodic oxidation surface treatmentThe surface treatment of aluminum and its alloy is mainly based on the anodic oxidation. The anodic oxide film is hard, and its corrosion resistance, heat resistance, insulation and adsorption capacity are also better. In spite of this, the anodic oxide film in a corrosive environment, still may lead to corrosion, especially small hole corrosion and other local corrosion, so that the use of the life of aluminum device has greatly reduced, even using a very short time to complete failure. Most of the alum。