Corrosion resistance and behavior of construction materials exposed to dilute sulfuric acid at elevated temperatures under static conditions
Laboratory investigation has been undertaken to determine the electrochemical behavior and corrosion resistance of various construction materials in a simulated hydrolysis environment (5 wt % sulfuric acid) at temperatures ranging from 90 to 220C. Tests were performed in an autoclave-type electrochemical cell. The corrosion behavior of the test materials was determined using computer-controlled DC potentiodynamic polarization. Corrosion rates of the test materials were determined using AC impedance techniques. Among the stainless steels tested, only alloy N08026 (Carpenter 20Mo-6) performed satisfactory up to a temperature of 100C. The alloy passivated spontaneously in the environment and corroded at a rate of less than 2 mpy. None of the stainless steels tested could be used at 120{degrees}C or above. A number of nickel-based alloys tested had good corrosion resistance up to 100C, but their corrosion rate exceeded 2 mpy at higher temperatures. Zirconium alloys were satisfactory up to 180C. Only tantalum and a tantalum-niobium alloy were satisfactory up to 220C.
- Research Organization:
- Tennessee Valley Authority, Muscle Shoals, AL (United States)
- Sponsoring Organization:
- Tennessee Valley Authority, Knoxville, TN (United States)
- OSTI ID:
- 10190293
- Report Number(s):
- Z-332; ON: DE95001723
- Resource Relation:
- Other Information: PBD: [1994]
- Country of Publication:
- United States
- Language:
- English
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37 INORGANIC
ORGANIC
PHYSICAL AND ANALYTICAL CHEMISTRY
SULFURIC ACID
CORROSIVE EFFECTS
STAINLESS STEELS
CORROSION
NICKEL BASE ALLOYS
HEAT RESISTING ALLOYS
NICKEL
MONEL 400
HASTELLOYS
INCOLOY 825
INCONEL 625
ZIRCONIUM BASE ALLOYS
TANTALUM
NIOBIUM ALLOYS
TANTALUM ALLOYS
DILUTION
AQUEOUS SOLUTIONS
360105
400400
CORROSION AND EROSION
ELECTROCHEMISTRY