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Mercury embrittlement crack initiation in 5083 aluminum alloys: the role of the oxide film

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conference contribution
posted on 06.12.2017, 00:00 authored by Richard CleggRichard Clegg
Mercury Embrittlement is a significant problem in natural gas facilities using aluminum cold boxes and has led to a number of major plant incidents. It has been postulated that the natural passive layer on aluminum provides an effective barrier between droplets of mercury and the underlying aluminum and this prevents mercury embrittlement. However, under certain circumstances this barrier is breached and embrittlement can occur. In this paper the condition of the mercury-aluminum interface is measured using ac impedance techniques and the effects of film aging conditions on the stability of the interface are studied. The film was modeled as a constant phase element and resistor in parallel and it was found that the resistance of the film increased with aging, although the effective film thickness only changed slightly. The paper finds that galvanic corrosion between the mercury droplet and underlying aluminum is likely to be a major cause of the breakdown of the mercury-aluminum interface.

Funding

Category 3 - Industry and Other Research Income

History

Parent Title

NACE Corrosion 2011 Conference and Expo. Environmentally Assisted Cracking - TEG 186X.

Issue

paper 11298

Start Page

1

End Page

10

Number of Pages

10

Start Date

01/01/2011

Finish Date

01/01/2011

Location

Houston, TX, USA

Publisher

NACE International

Place of Publication

Houston, TX, USA

Peer Reviewed

Yes

Open Access

No

External Author Affiliations

Institute for Resource Industries and Sustainability (IRIS); Process Engineering and Light Metals;

Era Eligible

Yes

Name of Conference

NACE Corrosion Conference and Expo