Corrosion Behavior Of Aluminium Alloy Aa2219−T87 Welded Plates in Sea Water

G  Venkatasubramaniana A  Sheik Mideena; Abhay K Jhab

doi:10.17485/ijst/2012/v5i11.7

Article

Corrosion Behavior Of Aluminium Alloy Aa2219−T87 Welded Plates in Sea Water

VIEWS 981
PDF 1666

Abstract
Full-Text HTML
Full-Text PDF
How to Cite

Indian Journal of Science and Technology

DOI: 10.17485/ijst/2012/v5i11.7

Year: 2012, Volume: 5, Issue: 11, Pages: 1-6

Original Article

Corrosion Behavior Of Aluminium Alloy Aa2219−T87 Welded Plates in Sea Water

G. Venkatasubramanian^a A. Sheik Mideen^a*, Abhay K Jha^b

^a Department of Chemistry, Sathyabama University, Jeppiaar Nagar,
^b Materials Characterization Division, Vikram Sarabhai Space Centre, Indian Space Research Organisation, [email protected], [email protected]*
*Author For Correspondence
Sheik Mideen
Department of Chemistry
Email:[email protected]*

This work is licensed under a Creative Commons Attribution 4.0 International License.

Abstract

The corrosion behavior of aluminium alloy AA2219−T87 welded plates in seawater was investigated using potentiodynamic polarization and EIS techniques. The potentiodynamic polarization curves reveal that heat affected zone (HAZ) is more prone to corrosion than weld zone (WZ) and base metal (BM). This is further confirmed by EIS which showed a decrease of Rct. The microstructures of AA2219− T87 were made by optical microscopy and SEM. The higher environmental susceptibility of HAZ as compared to BM is caused by the dissolution and segregation of CuAl2 intermetallic particles along the grain boundaries. The corrosion rate of WZ is due to the presence of micro pores and copper rich areas in α-matrix.
Keywords: Aluminium, EIS, SEM, Heat Affected Zone