Corrosion of SCWO constructional materials in Cl{sup {minus}} containing environments

Conference · Mon Nov 01 04:00:00 EST 1999

OSTI ID:696929

Mitton, D B; Kim, Y S; Yoon, J H; Take, S; Latanision, R M ^[1]

---

1. Massachusetts Inst. of Tech., Cambridge, MA (United States)

There is a need to destroy both military and civilian hazardous waste and an urgency, mandated by public concern over traditional waste handling methodologies, to identify safe and efficient alternative technologies. One very effective process for the destruction of such waste is supercritical water oxidation (SCWO). By capitalizing on the properties of water above its critical point (374 C and 22.4 MPa for pure water), this technology provides rapid and complete oxidation with high destruction efficiencies at typical operating temperatures. Nevertheless, corrosion of the materials of fabrication is a serious concern. While nickel and nickel-based alloys are generally considered important for severe service applications, results from laboratory and pilot-scale SCWO systems presently in operation indicate that they will not withstand some aggressive feeds. Significant weight loss and localized effects, including stress corrosion cracking (SCC) and dealloying, are seen in chlorinated environments. The current paper assesses the corrosion characteristics of various alloys exposed to high supercritical temperatures in a chlorinated feed stream containing salts.

• OSTI ID: 696929
• Report Number(s): CONF-990401--
• Country of Publication: United States
• Language: English

Related Subjects

32 ENERGY CONSERVATION, CONSUMPTION, AND UTILIZATION
CHLORINE
CORROSION
CORROSIVE EFFECTS
HAZARDOUS MATERIALS
NICKEL BASE ALLOYS
OXIDATION
SUPERCRITICAL STATE
WASTE PROCESSING