Abstract
This study discusses the corrosion behaviour of AA5083-H321 (Al-Mg) and metal inert gas (MIG) welded AA5083 in natural seawater from Darwin Harbour. These alloys are a common choice for the construction of marine structures and vessels due to their high corrosion resistance and weldability. Total immersion tests for a period of up to 68 days show low corrosion rates for AA5083 and MIG welded AA5083, although significantly higher than literature values. Monitoring of free corrosion potentials (Ecorr) for a period of up to 32 days indicates a more electrochemically active AA5083, which is in agreement with increased weight loss in this alloy than in the welded condition. Also, there is a significant effect of the specimen's surface condition, with a lower incidence of corrosion in specimens that retained their original passive layer as compared to polished material. Potentiodynamic polarisations evidenced a semi-passive behaviour of AA5083, and severe localised attack in MIG welded AA5083, with major pitting nucleation at the intermetallic particles.
| Original language | English |
|---|---|
| Title of host publication | Annual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013 |
| Place of Publication | Kerrimuir, Australia |
| Publisher | Australasian Corrosion Association |
| Pages | 266-275 |
| Number of pages | 10 |
| Volume | 1 |
| Edition | 1 |
| ISBN (Electronic) | 9781634394369 |
| ISBN (Print) | 978-1-63439-436-9 |
| Publication status | Published - 2013 |
| Event | Corrosion and Prevention: Annual Conference of the Australasian Corrosion Association (ACA 2013) - Brisbane, Australia, Brisbane, Australia Duration: 1 Jan 2013 → 13 Nov 2013 Conference number: 2013 |
Conference
| Conference | Corrosion and Prevention |
|---|---|
| Abbreviated title | ACA |
| Country/Territory | Australia |
| City | Brisbane |
| Period | 1/01/13 → 13/11/13 |
