Titanium as reactor material for SCWO applications. First experimental results

Conference · Thu Dec 31 04:00:00 EST 1998

OSTI ID:350169

Boukis, N; Friedrich, C; Dinjus, E ^[1]

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1. Forschungszentrum Karlsruhe (Germany)

According to literature data, nickel base alloys are not sufficiently corrosion resistant in chloride bearing SCWO environments. Titanium was proposed several times as a suitable material for the construction of a corrosion resistant reactor. Titanium does not show the required mechanical strength for high temperature high pressure applications and it can only be used to form liners for an SCWO apparatus. Therefore, pressure tubes made of alloy 625 were lined with titanium grade 2. Additionally corrosion tests with coupons made of titanium grades 2, 5, 7, 12 and {beta}-C were performed. The coupons were placed inside an alumina-lined reactor. Materials were exposed to simulated SCWO feeds consisting of water, oxygen and HCl, H{sub 2}SO{sub 4}, or H{sub 3}PO{sub 4}. Experimental temperatures were up to 600 C, pressures up to 27 MPa and experimental times up to 200 hours. Corrosion in chloride containing solution is low. In the presence of sulfate or phosphate, corrosion of titanium grade 2 becomes severe. For these environments an upper limit of the corrosion rate could be estimated.

• OSTI ID: 350169
• Report Number(s): CONF-980316--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
36 MATERIALS SCIENCE
CHEMICAL REACTORS
CHLORIDES
CORROSION RESISTANCE
CORROSIVE EFFECTS
HYDROCHLORIC ACID
INCONEL 625
LINERS
MECHANICAL PROPERTIES
PHOSPHORIC ACID
SULFURIC ACID
TITANIUM
WET OXIDATION PROCESSES