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EFFECTS OF STRAIN AMPLITUDE AND STRAIN RATE ON CORROSION PROCESS ACCELERATED BY DYNAMIC DEFORMATION |
WANG Zhengfu; LI Jin; WANG Jianqiu; KE Wei(Corrosion science Laboratory; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang) |
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WANG Zhengfu; LI Jin; WANG Jianqiu; KE Wei(Corrosion science Laboratory; Institute of Corrosion and Protection of Metals; Chinese Academy of Sciences; Shenyang). EFFECTS OF STRAIN AMPLITUDE AND STRAIN RATE ON CORROSION PROCESS ACCELERATED BY DYNAMIC DEFORMATION. Acta Metall Sin, 1994, 30(17): 213-217.
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Abstract Straining electrode technique has been utilized to study the effects of strain amplitude, strain rate and applied potential on electrochemical corrosion process of defoming metals. The chosen systems were Fe/3.5% NaCl and A537/3.5% NaCl+1%NaNO2 aqueous solutions. The experimental results showed that, the accelerating effect of plastic straining on the anodic dissolution was greater than that on the cathodic reaction. and this accelerating effect was mainly found near the free corrosion potential. In the strongly anodic and cathodic polarized region, the deforming effect on electrode reactions was not important because of the great reacting driving force. The strain current depended on the strain amplitude for active system and on the strain rate for the passive system, respectively. The change of deforming current was determined by the kinetic process of repassiviting of active area on the electrode surface.
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1HoarTP,WestJM,ProcRoySoc,A1962;298,3042HoarTP,GalveleJR.CorrosSci,1970;10:2133HoarTP,JonesRA.CorrosSci1973,13,7254StaehleRW.MaterSciEng,1976;25:207 |
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