Coping with the Phenomenon of Ammonia Stress Corrosion Cracking (eBook)

Published Date

December 2008

Coping with the Phenomenon of Ammonia Stress Corrosion Cracking (eBook)

(Excludes any applicable taxes)

This paper looks at the causes and then provides some measures for avoiding Ammonia Stress Corrosion Cracking. (16pp)

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SCC is a spontaneous crack formation where the usually fine cracks are of both inter- or transgranular nature ie they may propagate in many directions. SCC is produced by the combined action of tensile stresses and corrosion due to an agressive medium. Typical for SCC are very fine brittle cracks. The factors contributing to SCC are:
1 material
- type of material
- chemical composition
- micro structure condition (influence of heat treatment)
- deformation behaviour
- surface condition

2 medium
- type of material
- impurities
- temperature
- electro-chemical conditions (redox potential, corrosion potential)

3 stresses
- residual stresses from fabrication, including welding stresses
- operating stresses
- kind of stresses (static, cycling)

The mechanism of SCC may be explained as an accelerated anodic metal dissolution at the root of a crack where no protective layer exists due to chemical and mechanical influences. The formation of protective or passive layers which protect the growing flanks of the cracks above the crack root may explain the typical sharp and fine cracks,SCC is the result of a chemical reaction and so will occur faster at a higher temperature.

Paper Delivered by:
M Bockenhauer (Germanischer Lloyd AG, Germany)

Prepared for:
Gastech Kuala Lumpur 1988

For over 45 years, the Gastech Exhibition & Conference has been at the forefront of the international gas and LNG market. This world-renowned event is regarded as the most significant meeting place for gas and LNG professionals, where the global industry gathers to do business.

Gastech hosts major IOCs, NOC’s, global utility companies, EPC contractors, shipbuilders, pipeline companies, manufacturers, distributors, technology and service providers, all who play an active role in the global energy value chain.

Title: Coping with the Phenomenon of Ammonia Stress Corrosion Cracking (eBook)
Product Code: 4433G058
Published Date: December 2008

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