Simple to understand the surface of the aluminum alloy die casting process

　　Aluminum alloy die castingProducts mainly used in electronics, automobile, motor, household appliances and some of the communication industry, etc., some high performance, high precision, high quality and high toughnessAluminum alloy die castingProducts are used in large aircraft, ships and other demands higher in the industry.The main purpose or on some equipment parts.
　　Aluminum alloy die castingFeatures:
　　1, wide range of die casting
　　2, casting dimension precision, surface roughness is low
　　3, high productivity,
　　4, high utilization rate of metal
　　5, high casting strength and surface hardness
　　A, aluminum phosphide
　　By means of SEM, XRD, potential time curve, membrane method such as heavy change promoter was studied in detail, fluoride, Mn2 + and Ni2 +, Zn2 + and PO4 and Fe2 +, etc. The influence of the process of aluminium phosphide.Fluoride can promote film-forming, weight increase membrane, refine the grain size;Mn2 + and Ni2 + can significantly refine grain, make the phosphating coating is compact and uniform and can improve the look of the phosphating film;Zn2 + concentration is low, can't film or film is poor, with the increase of Zn2 + concentration, membrane weight increase;PO4 content on the phosphating film influence on weight, and improve the PO4.Content increase heavy phosphating film.
　　Second, the aluminum alkaline electropolishing technology
　　The alkaline polishing solution study, compared the corrosion inhibitor, viscosity agent on the polishing effect, successfully obtained the polishing effect is very good system of alkaline solution, and got to reduce the operating temperature for the first time, lengthen the service life of the solution, but also can improve the polishing effect of additives.Explores the dc pulse electrochemical polishing method, the feasibility of polished aluminium in alkaline conditions, the results show that the pulse electrochemical polishing method can achieve dc constant voltage electrolysis polishing leveling effect, but the leveling speed slower.
　　Third, aluminium and aluminium alloy and environmentally friendly chemical polishing
　　Determine the development of a sulfuric acid phosphate as base fluid and environmentally friendly new technology of chemical polishing, the technology to realize zero emission of NOx and overcome quality defects existing in the previous similar technology.New technology is the key in the base to add some compounds with special function instead of nitric acid.To do this you will first need to analyze the three acid polishing process of aluminium, especially focuses on the role of nitric acid.Aluminum nitrate in the main role in the chemical polishing corrosion inhibition and improve polishing brightness.In pure chemical polishing experiments in a sulfuric acid, phosphate think add special material should be in a sulfuric acid phosphate can inhibit corrosion, reduce total corrosion, and must have a better effect on the whole peaceful and bright
　　Four, electrochemical surface strengthening treatment of aluminum and its alloys
　　Anode oxidation of aluminum and its alloys in neutral system, sedimentary formation class ceramic conversion of amorphous composite membrane process, properties, morphology, composition and structure, preliminary discussion on the film-forming process and the mechanism of the film.On the neutral systemAluminum alloy die castingHave good adaptability, anti-rust aluminum, wrought aluminium and other seriesAluminum alloy die castingProducts can be better film.