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Study on DC welding parameters of al-alloy shaping based on arc-welding robot

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China Welding 2008年第4期17卷 43-46页

作者：杜乃成胡绳荪杨雪梅冯胜强 School of Materials Science and Engineering Tianjin University Tianjin Institute of Process Automation and Instrumentation International Division of China Petroleum Pipeline Bureau

The al-alloy arc-welding shaping system based on arc-welding robot is established, and the al-alloy shaping manufacture is realized with the DC （direct current） gas metal arc welding （GMAW）. The research indicates that the metal transfer type of DC GMA W, heat input and the initial temperature of the workpiece greatly affect the al-alloy shaping based on arc welding robot. On the penetration, the weld width and the reinforcement, the influence of welding parameters is analyzed by generalized regression neural network （GRNN） fitting.

关键词： arc-welding robot al-alloy shaping welding parameters

Study on direct-chain diacid modified phenolic resin for al-alloy casting

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China Foundry 2005年第1期2卷 28-33页

作者： Yundong JI Jirong LUO Moyin LI School of Materials Huangzhong University of Science and Technology Wuhan 430074 Hubei P. R. China Wuhan Life Chemistry and Industry Co. Wuhan 430011 Hubei P. R. China

Resin coated sand (RCS) with phenolic resin matrix can hardly be collapsed when it is used in al-alloy casting. Adding collapsing agent and reducing the concentration of resin are solutions adopted by workers, but these methods tend to reduce the initial strength of RCS. Synthesis of modified phenolic resin with direct-chain diacid DAn (/JS=6, where n means carbon amount) was studied here. The effects of the addition of modifying agent on molecular weight, gel time and softening point were investigated. Optimal addition of DAn (10% phenol) was obtained by testing the initial and retained flexural strengths of the modified resin. FT-IR spectra showed that carbonyl shifts to higher wave number. With the use of TG, SEM and strength loss curves, the relation between initial and retained strengths was analysed. Tests on the heated deformation curve, before and after resin modification, show that PF-DA10 has the characteristic of higher initial and retained strengths together.

关键词： direct-chain diacid PF resin modify al-alloy casting RCS

Corrosion Penetration and Crystal Structure of AA5022 in HCl Solution and Rare Earth Elements

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Journal of Materials Science & Technology 2005年第3期21卷 324-330页

作者： A.A.El-Meligi S.H.Sanad A.A.Ismail A.M.Barakat Electrochem. and Corrosion Lab. Physical Chemistry Dept. National Research Centre Dokki Cairo EgypElectrochem. and Corrosion Lab. Physical Chemistry Dept. National Research Centre Dokki Cairo EgypElectrochem. and Corrosion Lab. Physical Chemistry Dept. National Research Centre Dokki Cairo EgypChemistry Dept. Faculty of Science Cairo University Cairo Egypt

al-alloy (AA5022) corrosion penetration (CP) and crystal structure were investigated after running static immersion corrosion tests in 1 mol/L HCl solution and different concentrations of rare earth elements (La3+), (Ce3+) and their combination, at different temperatures. X-ray diffraction (XRD) was used to examine the surface structure before and after immersion, and secondary electron detector (SED) was operated to study surface morphology. In 1 mol/L HCI solution the corrosion penetration increased with increasing temperature and immersion time. The increase of La3+ concentrations up to 1000×10-6 g/L led to the decrease in the corrosion penetration, and the decrease in Ce3+ concentrations up to 50×10-6 g/L decreases the corrosion penetration of the alloy. Mix3 (combination of La3+ and Ce3+) dramatically reduced the corrosion penetration. This suggests that a synergistic effect exists between La3+ and Ce3+. The reaction kinetics both in absence and presence of La3+ and Ce3+ and their combination would follow a parabolic rate law. The XRD patterns revealed that the intensities of certain hkl phases are affected. The crystalline structure has not been deformed either before or after testing and there are no additional peaks except that of the as-received alloy. In the case of accelerating CP, the surface morphology shows that the roughness and voids of surface are increased.

关键词： al-alloy Corrosion penetration Crystal structure XRD

Synergetic effect of stannate with o-aminophenol on inhibiting H2 evolution of A1 anode in strong alkaline media

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Journal of Shanghai University(English Edition) 2007年第4期11卷 426-431页

作者：张燕宋玉苏王源升 Department Of Chemistry and Materials College of Sciences Naval University of Engineering Wuhan 430033 P. R. China Administrative Office of Training Naval University of Engineering Wuhan 430033 P. R. China

The performance of al-alloy anode in 4 mol/L KOH with and without stannate and o-aminophenol at 25℃ and 55℃ was studied by hydrogen collection, potentiodynamic polarization and electrochemical impedance spectrum, o-aminophenol acts as a perfect inhibitor because of its adsorbability and forming chelate complex at its optimum concentration of 0.4 mol/L. Stannate enhances the inhibition of o-aminophenol and improves the activity of al-alloy because of its reduction to tin. There is synergetic effect of stannate with o-aminophenol on the behavior of al-alloy, and the inhibitive efficiency at 55℃ is better than that at 25 ℃.

关键词： o-amniophenol stannate al-alloy hydrogen evolution alkaline media

Investigation　on　Surface　Roughness　for　Press－Finishing　of　aluminium　alloy　with　PCD　Sphere

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Journal of Harbin Institute of Technology(New Series) 1996年第2期3卷 58-63页

作者：余兴波王庆超

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ＩｎｖｅｓｔｉｇａｔｉｏｎｏｎＳｕｒｆａｃｅＲｏｕｇｈｎｅｓｓｆｏｒＰｒｅｓｓ－ＦｉｎｉｓｈｉｎｇｏｆＡｌｕｍｉｎｉｕｍＡｌｌｏｙｗｉｔｈＰＣＤＳｐｈｅｒｅ￥ＹＵＸｉｎｇｂｏ；ＷＡＮＧＱｉｎｇｃｈａｏ（余兴波，王庆超）（Ｄｅｐｔ．ｏｆＭｅｃｈａｎｉｃ...

关键词： ss:Artificial diamond polycrystal diamond (PCD) diamond tool press-finishing machining al-alloy precision machining

RHEOLOGICal CHARACTERISTICS OF al-6.5WT.%Si SEMISOLID METal SLURRIES

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RHEOLOGICAL CHARACTERISTICS OF Al-6.5WT.%Si SEMISOLID METAL ...