Corrosion, stress corrosion cracking, and electrochemistry of the iron and nickel base alloys in caustic environments. Progress report, March 1, 1978--February 28, 1979
Stress corrosion cracking susceptibility of 2-1/4Cr--1Mo steel has been studied in the pH range 0.5 to 13 in one molar sulfate solutions containing Na/sub 2/S additions, by the slow strain rate (10/sup -6/S/sup -1/) technique. Brittle fracture was observed over the entire pH range but only at cathodic potentials which were below the hydrogen evolution region. Crack propagation rates (CPRs) in Nickel-200 have been measured as a function of potential in 17.5N NaOH solution at 138/sup 0/C, using the fast straining electrode technique. CPRs in the potential range -0.75 to -0.6V/sub H/ were found to be high on the order of 10/sup -8/m/s, but relatively low < 10/sup -9/ m/s, outside this potential range. Crack propagation rates of Type 304L at 138/sup 0/C in 17.5N NaOH solution with and without a chromate inhibitor have been measured as a function of potential using the fast straining electrode technique. No significant drop in the CPR was observed due to the presence of the inhibitor in the solution. Corrosion rates of pure metals Fe, Cr, and Ni have been estimated as a function of potential in the 17.5N NaOH solution at 130/sup 0/C using the long-time current decay measurements. Of the above three metals, iron was found to be most unstable in the caustic solution over the entire potential range from -1.0 to 0.4V/sub H/.
- Research Organization:
- Ohio State Univ., Columbus (USA). Dept. of Metallurgical Engineering
- DOE Contract Number:
- EY-76-S-02-2421
- OSTI ID:
- 6489847
- Report Number(s):
- COO-2421-5; TRN: 79-006947
- Country of Publication:
- United States
- Language:
- English
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Corrosion, stress corrosion cracking, and electrochemistry of the iron and nickel base alloys in caustic environments. Progress report, 1 March 1976--28 February 1977
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Related Subjects
CHROMIUM
CORROSION
CHROMIUM-MOLYBDENUM STEELS
STRESS CORROSION
IRON
NICKEL
NICKEL ALLOYS
STAINLESS STEEL-304L
CRACKS
SODIUM HYDROXIDES
SODIUM SULFIDES
TENSILE PROPERTIES
ALKALI METAL COMPOUNDS
ALLOYS
CHALCOGENIDES
CHEMICAL REACTIONS
CHROMIUM ALLOYS
CHROMIUM STEELS
CHROMIUM-NICKEL STEELS
CORROSION RESISTANT ALLOYS
ELEMENTS
HEAT RESISTANT MATERIALS
HEAT RESISTING ALLOYS
HYDROGEN COMPOUNDS
HYDROXIDES
IRON ALLOYS
IRON BASE ALLOYS
MATERIALS
MECHANICAL PROPERTIES
METALS
OXYGEN COMPOUNDS
SODIUM COMPOUNDS
STAINLESS STEELS
STEELS
SULFIDES
SULFUR COMPOUNDS
TRANSITION ELEMENTS
360105* - Metals & Alloys- Corrosion & Erosion