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Title: 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.
Authors:
Publication Date:
OSTI Identifier:
10190293
Report Number(s):
Z--332
ON: DE95001723
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: [1994]
Research Org:
Tennessee Valley Authority, Muscle Shoals, AL (United States)
Sponsoring Org:
Tennessee Valley Authority, Knoxville, TN (United States)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 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