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Paper Information

Journal:   IRANIAN JOURNAL OF MATERIALS SCIENCE AND ENGINEERING   JUNE 2014 , Volume 11 , Number 2; Page(s) 25 To 36.
 
Paper: 

INVESTIGATING THE CORROSION BEHAVIOR OF NANO STRUCTURED COPPER STRIP PRODUCED BY ACCUMULATIVE ROLL BONDING (ARB) PROCESS IN ACIDIC CHLORIDE ENVIRONMENT

 
 
Author(s):  NIKFAHM A.*, DANAEE I., ASHRAFI A., TOROGHINEJAD M.R.
 
* DEPARTMENT OF TECHNICAL INSPECTION ENGINEERING,ABADAN FACULTY OF PETROLEUM ENGINEERING,PETROLEUM UNIVERSITY OF TECHNOLOGY,ABADAN, IRAN
 
Abstract: 

In this research accumulative roll bonding process as sever plastic deformation process was applied up to 8 cycles to produce the ultraflne grain copper. Microstructure of cycle I, cycle 4 and cycle 8 investigated by TEM images. By analyzing TEM images the grain size measured below I 00 nm in cycle 8 and it was with an average grain size of200 nm. Corrosion resistance of rolled copper strips in comparing with unrolled copper strip was investigated in acidic (pH=2) 3.5 wt.% NaCl solution. Potentiodynamic polarization and EJS tests usedfor corrosion resistance investigations. The corrosion morphologies analyzed by FE-SEM microscopy ajier polarization test and immersion for 40 hours. Results show that the corrosion resistance decreased up to cycle 2 and increased after rolledforforth time. The corrosion degradation was more intergranular in cycle 2 and unrolled counterpart. It was more uniform rather than intergranular type in cycle 8. Corrosion current density in unrolled sample (2.55 f1Acm-2) was about two times of that in cycle 8 (1.45 f.iAcm-2). The higher corrosion rate in cycle 2 in comparison with others was attributed to unstable microstructure and increase in dislocation density whereas the uniform corrosion in cycle 8 was due to stable UFG formation.

 
Keyword(s): ULTRAJINE GRAIN, CORROSION, COPPER, NACL, ACCUMULATIVE ROLL BONDING, SPD
 
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