Factors controlling nitrate cracking of mild steel

Conference · Sat Jan 01 04:00:00 EST 1977

OSTI ID:7295258

Donovan, J. A.

Nitrite and hydroxide ions inhibit the growth of nitrate stress corrosion cracks in mild steel. Crack growth measurements showed that sufficient concentrations of nitrite and hydroxide ions can prevent crack growth; however, insufficient concentrations of these ions did not influence the Stage II growth rate or the threshold stress intensity, but extended the initiation time. Stage III growth was discontinuous. Oxide formed in the grain boundaries ahead of the crack tip and oxide dissolution (Stage II) and fracture (Stage III) are the proposed mechanisms of nitrate stress corrosion crack growth.

• Research Organization: Du Pont de Nemours (E.I.) and Co., Aiken, S.C. (USA). Savannah River Lab.
• DOE Contract Number: EY-76-C-09-0001
• OSTI ID: 7295258
• Report Number(s): DP-MS-77-53; CONF-771010-4
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360105* -- Metals & Alloys-- Corrosion & Erosion
ALKALI METAL COMPOUNDS
ALLOYS
CHEMICAL REACTIONS
CORROSION
CORROSIVE EFFECTS
CRACKS
INTERGRANULAR CORROSION
IRON ALLOYS
IRON BASE ALLOYS
NITRATES
NITROGEN COMPOUNDS
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
SODIUM NITRATES
STEELS
STRESS CORROSION