Corrosion Behavior of Commercial Aluminum Alloy Processed by Equal Channel Angular Pressing | Zendy

Atef Korchef | Zendy; A. Kahoul | Zendy

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Corrosion Behavior of Commercial Aluminum Alloy Processed by Equal Channel Angular Pressing

Author(s) -

Atef Korchef,

A. Kahoul

Publication year - 2013

Publication title -

international journal of corrosion

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.312

H-Index - 18

eISSN - 1687-9333

pISSN - 1687-9325

DOI - 10.1155/2013/983261

Subject(s) - materials science , alloy , metallurgy , corrosion , pressing , 6111 aluminium alloy , dissolution , aluminium , severe plastic deformation , galvanic corrosion , volume fraction , polarization (electrochemistry) , immersion (mathematics) , grain boundary , microstructure , composite material , chemical engineering , chemistry , mathematics , pure mathematics , engineering

A commercial aluminum alloy was subjected to severe plastic deformation through equal channel angular pressing (ECAP). The alloy contains a low volume fraction of α-AlFeSi located essentially at the grain boundaries. The corrosion behavior of the ECAP’ed alloy was investigated in NaCl solution using potentiodynamic polarization and immersion tests. The effects of scan rate and NaCl concentration on the alloy susceptibility to corrosion were also studied. The results obtained were compared with those of the nonpressed alloy. ECAP leads to an intensive grain refinement accompanied by an increased dislocation density. All electrochemical tests confirm that corrosion resistance of the alloy remarkably diminished with increasing the ECAP number of passes. This is presumably due to the breakdown of the α-AlFeSi after ECAP leading to higher number of galvanic cells and enhanced dissolution of the aluminum matrix

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