Corrosion of marine grade aluminium alloys in tropical natural seawater

M. Vargas; K. Kannoorpatti

Corrosion of marine grade aluminium alloys in tropical natural seawater

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper published in Proceedings › peer-review

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 (E_corr) 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

Cite this

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title = "Corrosion of marine grade aluminium alloys in tropical natural seawater",

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.",

keywords = "Aluminum, Aluminum alloys, Corrosion resistance, Gas metal arc welding, Inert gas welding, Inert gases, Offshore structures, Seawater, Welding, Aa5083 alloys, Corrosion behaviour, Corrosion potentials, Immersion tests, Inter-metallic particle, Mig welds, Surface conditions, Weight loss, Corrosion rate",

author = "M. Vargas and K. Kannoorpatti",

year = "2013",

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booktitle = "Annual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013",

publisher = "Australasian Corrosion Association",

edition = "1",

note = "Corrosion and Prevention : Annual Conference of the Australasian Corrosion Association (ACA 2013), ACA ; Conference date: 01-01-2013 Through 13-11-2013",

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Corrosion of marine grade aluminium alloys in tropical natural seawater. / Vargas, M.; Kannoorpatti, K.
Annual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013. Vol. 1 1. ed. Kerrimuir, Australia: Australasian Corrosion Association, 2013. p. 266-275.

Research output: Chapter in Book/Report/Conference proceeding › Conference Paper published in Proceedings › peer-review

TY - GEN

T1 - Corrosion of marine grade aluminium alloys in tropical natural seawater

AU - Vargas, M.

AU - Kannoorpatti, K.

N1 - Conference code: 2013

PY - 2013

Y1 - 2013

N2 - 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.

AB - 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.

KW - Aluminum

KW - Aluminum alloys

KW - Corrosion resistance

KW - Gas metal arc welding

KW - Inert gas welding

KW - Inert gases

KW - Offshore structures

KW - Seawater

KW - Welding

KW - Aa5083 alloys

KW - Corrosion behaviour

KW - Corrosion potentials

KW - Immersion tests

KW - Inter-metallic particle

KW - Mig welds

KW - Surface conditions

KW - Weight loss

KW - Corrosion rate

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M3 - Conference Paper published in Proceedings

SN - 978-1-63439-436-9

VL - 1

SP - 266

EP - 275

BT - Annual Conference of the Australasian Corrosion Association 2013: Corrosion and Prevention 2013

PB - Australasian Corrosion Association

CY - Kerrimuir, Australia

T2 - Corrosion and Prevention

Y2 - 1 January 2013 through 13 November 2013

ER -

Corrosion of marine grade aluminium alloys in tropical natural seawater

Abstract

Conference

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