51315-5571-Carbon Steel Corrosion in Anoxic Alkaline Water

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Product Number: 51315-5571-SG

ISBN: 5571 2015 CP

Author: Xihua He

Publication Date: 2015

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CARBON STEEL CORROSION IN ANOXIC ALKALINE WATERXihua He1 and Tae Ahn21Southwest Research Institute 6220 Culebra Road San Antonio Texas 782382U.S. Nuclear Regulatory Commission Washington DC 20555Carbon steel has been considered as a candidate canister material for geologic disposal of high?level waste in several countries including Switzerland France Belgium Japan and Canada where a reducing environment dominates after the thermal period. For example the supercontainer concept in Belgium’s proposed Boom Clay repository comprises a carbon steel overpack containing the waste and an outer stainless steel liner that defines an annulus containing a cementitious material. The outer surface of the carbon steel overpack is expected to be in contact with concrete porewater with pH about 12.5 persisting for thousands of years. In this water passive dissolution is the dominant corrosion mode and other corrosion modes are expected to be insignificant including pitting corrosion and microbially influenced corrosion. In this work both literature reviews and independent experimental studies were conducted to investigate carbon steel corrosion in anoxic alkaline water and the effect of chloride sulfide and thiosulfate on passive dissolution. Passive dissolution hydrogen generation and corrosion rate evolution will be discussed in the paper.This abstract is an independent product of the Center for Nuclear Waste Regulatory Analyses and does not necessarily reflect the view or regulatory position of the U.S. Nuclear Regulatory Commission (NRC). NRC staff views expressed herein are preliminary and do not constitute a final judgment or determination of the matters addressed or of the acceptability of any licensing action that may be under consideration at NRC.