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논문 기본 정보

자료유형
학술저널
저자정보
Aluru Praveen Sekhar (Indian Institute of Engineering Science and Technology) Arijit Samaddar (Indian Institute of Engineering Science and Technology) Ashim Bikash Mandal (Indian Institute of Engineering Science and Technology) Debdulal Das (Indian Institute of Engineering Science and Technology)
저널정보
대한금속·재료학회 Metals and Materials International Metals and Materials International Vol.27 No.12
발행연도
2021.12
수록면
5,059 - 5,073 (15page)
DOI
10.1007/s12540-020-00843-1

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초록· 키워드

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This report investigates the influence of ageing on the susceptibility to intergranular corrosion (IGC) of an Al?Mg?Si alloy. The selected AA6063 Al-alloy has been exposed to ageing treatments at a predetermine temperature of 423 K for durationsof 1 to 168 h to achieve the wide range of ageing states covering under- to peak- to over-aged. The ageing behaviour of theselected alloy has been determined based on the results of hardness and tensile properties. The susceptibility to IGC has beenevaluated following the British standard (BS ISO-11846) method B and assessed based on the average and maximum corrosiondepths apart from in-depth surface and sub-surface characterizations of corroded specimens. It has been observed thatthe depths of corrosion increase monotonically with increase in ageing time. With progress of artificial ageing, the dominantmode of corrosion gradually changes in the order of minor pitting, moderate pitting, pitting plus localized IGC, localizedIGC and uniform IGC. The phenomenon of preferential dissolution of Mg from the β″ (Mg5Si6) and β (Mg2Si) precipitatesas well as the existence of Fe-rich intermetallic particles at the grain boundaries cause the pitting and intergranular corrosionbecause of the formation of local galvanic cells between the lower corrosion potential of Mg-depleted precipitates orprecipitate free zones and to the adjacent anodic grain boundary precipitates.

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