Effects of surface chromium depletion on the localized corrosion of Alloy 825 as a high-level waste container material

Book · Sat Dec 31 04:00:00 EST 1994

OSTI ID:70092

Dunn, D S; Sridhar, N; Cragnolino, G A ^[1]

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1. Southwest Research Inst., San Antonio, TX (United States). Center for Nuclear Waste Regulatory Analyses

The effects of the chromium depleted mill finished surface on the localized corrosion resistance of alloy 825 were investigated. Tests conducted in solutions simulating the groundwater at Yucca Mountain with a higher concentration of chloride indicated that the breakdown and repassivation potentials for the mill finished surfaces were more active than those for polished surfaces. Potentiodynamic polarization tests indicated that pits can be initiated on the chromium depleted surface at potentials of 220 mV{sub SCE} in a solution containing 1,000 ppm chloride at 95 C. Potentiostatic tests identified a similar pit initiation potential for the mill finished surface. However, under longer term potentiostatic tests, a higher potential of 300 mV{sub SCE} was needed to sustain stable pit growth beyond the chromium depleted layer. An increase in the surface roughness decreased the localized corrosion resistance of the material.

• OSTI ID: 70092
• Report Number(s): CONF-940222--
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
36 MATERIALS SCIENCE
BRINES
CHROMIUM
CONCENTRATION RATIO
CONTAINERS
CORROSION RESISTANCE
CORROSION RESISTANT ALLOYS
CORROSIVE EFFECTS
ELECTROCHEMICAL CORROSION
EXPERIMENTAL DATA
GROUND WATER
HIGH-LEVEL RADIOACTIVE WASTES
INCOLOY 825
PITTING CORROSION
RADIOACTIVE WASTE DISPOSAL
SURFACE FINISHING
SURFACE PROPERTIES
YUCCA MOUNTAIN
Yucca Mountain Project