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Title: Long-term corrosion/oxidation studies under controlled humidity conditions

Abstract

Independent of thermal loading scenarios, the waste packages at the potential repository at Yucca Mountain, Nevada will be exposed to environmental conditions where there is the possibility of significant water film formation occurring on the waste packages. Water films can cause aggressive aqueous film electrochemical corrosion on susceptible metals or alloys. Water film formation will be facilitated when relative humidities are high, when hygroscopic salts are present on the surfaces, when corrosion products are hygroscopic, and when particles form crevices with the surfaces (capillary effect). Also certain gaseous contaminants, such as, NO{sub x} and SO{sub 2}, can facilitate water film formation. It should be noted that water film formation can occur at isolated spots (e.g. surface defects and salt particles) and need not cover the entire surface for electrochemical corrosion to occur. This activity will characterize the long term corrosion of metal specimens at two nominal relative humidities (50 and 85%) and at 80 C. Under the low relative humidity (50%) condition, water film formation is expected to be limited and therefore aqueous film electrochemical corrosion is expected also to be limited. Under the high relative humidity (85%) condition, significant water film formation is expected to occur under some testmore » conditions, and subsequently aqueous film electrochemical corrosion will occur on susceptible materials.« less

Authors:
Publication Date:
Research Org.:
Lawrence Livermore National Lab., CA (US)
Sponsoring Org.:
USDOE Office of Civilian Radioactive Waste Management (RW) (US)
OSTI Identifier:
2801
Report Number(s):
UCRL-ID-132291
TRN: US0101321
DOE Contract Number:  
W-7405-ENG-48
Resource Type:
Technical Report
Resource Relation:
Other Information: PBD: 13 Oct 1997
Country of Publication:
United States
Language:
English
Subject:
12 MANAGEMENT OF RADIOACTIVE WASTES, AND NON-RADIOACTIVE WASTES FROM NUCLEAR FACILITIES; 36 MATERIALS SCIENCE; ALLOYS; CORROSION PRODUCTS; ELECTROCHEMICAL CORROSION; HUMIDITY; WASTE FORMS; GROUND WATER; YUCCA MOUNTAIN; RADIOACTIVE WASTE FACILITIES; RADIOACTIVE WASTE DISPOSAL; CONTAINERS

Citation Formats

Gdowski, G. Long-term corrosion/oxidation studies under controlled humidity conditions. United States: N. p., 1997. Web. doi:10.2172/2801.
Gdowski, G. Long-term corrosion/oxidation studies under controlled humidity conditions. United States. doi:10.2172/2801.
Gdowski, G. Mon . "Long-term corrosion/oxidation studies under controlled humidity conditions". United States. doi:10.2172/2801. https://www.osti.gov/servlets/purl/2801.
@article{osti_2801,
title = {Long-term corrosion/oxidation studies under controlled humidity conditions},
author = {Gdowski, G},
abstractNote = {Independent of thermal loading scenarios, the waste packages at the potential repository at Yucca Mountain, Nevada will be exposed to environmental conditions where there is the possibility of significant water film formation occurring on the waste packages. Water films can cause aggressive aqueous film electrochemical corrosion on susceptible metals or alloys. Water film formation will be facilitated when relative humidities are high, when hygroscopic salts are present on the surfaces, when corrosion products are hygroscopic, and when particles form crevices with the surfaces (capillary effect). Also certain gaseous contaminants, such as, NO{sub x} and SO{sub 2}, can facilitate water film formation. It should be noted that water film formation can occur at isolated spots (e.g. surface defects and salt particles) and need not cover the entire surface for electrochemical corrosion to occur. This activity will characterize the long term corrosion of metal specimens at two nominal relative humidities (50 and 85%) and at 80 C. Under the low relative humidity (50%) condition, water film formation is expected to be limited and therefore aqueous film electrochemical corrosion is expected also to be limited. Under the high relative humidity (85%) condition, significant water film formation is expected to occur under some test conditions, and subsequently aqueous film electrochemical corrosion will occur on susceptible materials.},
doi = {10.2172/2801},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1997},
month = {10}
}

Technical Report:

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