Stress corrosion cracking of carbon steel in ammonia

Journal Article · Fri Dec 01 04:00:00 EST 1989 · Materials Performance; (USA)

OSTI ID:7258603

Lunde, L; Nyborg, R ^[1]

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1. Institute for Energy Technology, N-2007 Kjeller (NO)

The authors discuss how stress corrosion cracking (SCC) growth of carbon steel in ammonia increases with the stress intensity factor and follows approximately the square root of the exposure time. The reduction of crack growth rate with time is mainly caused by crevice corrosion attack in the outer part of the crack. SCC of carbon steel in ammonia is prevented by cathodic polarization. With high anodic polarization, SCC occurs in ammonia with 2000 ppm water and in ammonia without oxygen. Coupling to zinc, aluminum, and magnesium anodes gives cathodic protection and prevents SCC. Aluminum and zinc metal spray both prevent cracking.

• OSTI ID: 7258603
• Journal Information: Materials Performance; (USA), Journal Name: Materials Performance; (USA) Vol. 28:12; ISSN MTPFB; ISSN 0094-1492
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360103 -- Metals & Alloys-- Mechanical Properties
360105* -- Metals & Alloys-- Corrosion & Erosion
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400400 -- Electrochemistry
ALKALINE EARTH METALS
ALLOYS
AMMONIA
ANODES
CARBON STEELS
CATHODIC PROTECTION
CHEMICAL REACTIONS
CHEMISTRY
CORROSION
CORROSION INHIBITORS
CORROSION PROTECTION
CORROSIVE EFFECTS
COUPLING
CRACKING
CREVICE CORROSION
DECOMPOSITION
ELECTROCHEMISTRY
ELECTRODES
ELEMENTS
HYDRIDES
HYDROGEN COMPOUNDS
IRON ALLOYS
IRON BASE ALLOYS
MAGNESIUM
METALS
NITROGEN COMPOUNDS
NITROGEN HYDRIDES
NONMETALS
OXYGEN
PYROLYSIS
STEELS
STRESS CORROSION
THERMOCHEMICAL PROCESSES
ZINC