Improvement of pitting corrosion resistance for Al-Cu alloy in sodium chloride solution through equal-channel angular pressing
نویسندگان
چکیده
منابع مشابه
Re-strengthening in AA6063 Alloy During Equal Channel Angular Pressing
Equal channel angular pressing (ECAP) is carried out using two different configurations for the exit channel of the ECAP die, i.e., relieved and choked, with angles of 0.2 °. It is found that using a die with relieved exit channel, the sample was extruded for 6 passes with no surface cracks and an average cell size of 727 nm and a fraction of high angle grain boundaries of 54 % were achieved. M...
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The electrochemical studies of pitting corrosion of CuFe alloy (70% Cu30%Fe) were carried out in sodium chloride solutions. The techniques of measurements were: open circuit potential, potentiodynamic polarization and electrochemical impedance spectroscopy. The effect of different concentrations of the inorganic additives (WO4 , PO4 , NO2 , B4O7 , CrO4 ) on the pitting corrosion of the alloy in...
متن کاملSize effect in equal channel angular pressing (ECAP) process
The influence of the sample size (diameter while keeping the length constant) in equal channel angular pressing (ECAP) of pure aluminum is examined using finite element method (FEM) and experiment. Different sized aluminum rods were processed via ECAP and the effect of sample size on the strain homogeneity, process load, and the ratio of the friction to the total force were evaluated. The resul...
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The microstructural evolution during the equal channel angular (ECA) pressing process of an α+ θ′ two-phase Al-1.7at.%Cu alloy has been studied by transmission electron microscopy (TEM) and energy-filtered transmission electron microscopy (EF-TEM). The θ′ precipitates are fragmented into fine particles after a few passes of ECA perssing. The θ′ precipitates are almost completely dissolved after...
متن کاملAchieving microstructures prone to superplastic deformation in an Al - Zn - Mg - Cu alloy by equal channel angular pressing
An Al-Zn-Mg-Cu alloy without Sc or Zr additions was subjected to overaging and processing by equal channel angular pressing, obtaining a grain size of ∼160 nm and a fraction of high-angle boundaries of 56%. The high elongations attained at high strain rate (10-10 s) and low test temperature (250-300 oC) are attributed to the formation of new recrystallized grains, ∼500 nm in size, during heatin...
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ژورنال
عنوان ژورنال: Progress in Natural Science: Materials International
سال: 2011
ISSN: 1002-0071
DOI: 10.1016/s1002-0071(12)60062-8