Corrosion, stress corrosion cracking, and electrochemistry of the iron and nickel base alloys in caustic environments
The electrochemical behavior of high purity (99.95% to 99.99%) iron in 0.6M NaCl and 1.0M Na/sub 2/SO/sub 4/ containing H/sub 2/S (50 ppM to 34,000 ppM) was studied using cyclic voltammetry, chronoamperometry, and slow scan rate polarization. Results have indicated that iron does undergo passivation in sulfate solutions containing H/sub 2/S. Iron dissolution depends on the presence of Cl/sup -/, the concentration of H/sub 2/S and solution pH. An equation is given that describes the anodic Tafel current densities. The slow strain rate test was used to evaluate the effect of electrode potential on the susceptibility of 2-1/4Cr, Mo steel to stress corrosion cracking in boiling 50% NaOH solution. Susceptibility decreased and general corrosion increased with increasing potentials. Failures contained a combination of ductile and brittle fracture. Time-to-failure was longest for controlled potentials of -700 and -600mV (Hg/HgO reference) in the -1100 to -400mV range used in this study.
- Research Organization:
- Ohio State Univ., Columbus (USA). Dept. of Metallurgical Engineering
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AS02-76ER02421
- OSTI ID:
- 5542872
- Report Number(s):
- DOE/ER/02421-6
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
CHROMIUM-MOLYBDENUM STEELS
STRESS CORROSION
IRON
ELECTROCHEMICAL CORROSION
AQUEOUS SOLUTIONS
BOILING
CHEMICAL REACTION KINETICS
CORROSION RESISTANCE
DISSOLUTION
HYDROGEN SULFIDES
PASSIVATION
SODIUM CHLORIDES
SODIUM HYDROXIDES
SODIUM SULFATES
ALKALI METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHLORIDES
CHLORINE COMPOUNDS
CHROMIUM ALLOYS
CHROMIUM STEELS
CORROSION
DISPERSIONS
ELEMENTS
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
HYDROXIDES
IRON ALLOYS
IRON BASE ALLOYS
KINETICS
METALS
MIXTURES
OXYGEN COMPOUNDS
PHASE TRANSFORMATIONS
REACTION KINETICS
SODIUM COMPOUNDS
SOLUTIONS
STEELS
SULFATES
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS
360105* - Metals & Alloys- Corrosion & Erosion