Premium
Electrochemical behavior of carbon steel with bentonite/sand in saline environment
Author(s) -
Kitayama Ayami,
Taniguchi Naoki,
Mitsui Seiichiro
Publication year - 2021
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.202011689
Subject(s) - bentonite , carbon steel , corrosion , passivation , carbon fibers , environmental science , materials science , buffer (optical fiber) , salt (chemistry) , electrochemistry , metallurgy , waste management , geotechnical engineering , geology , composite material , chemistry , electrode , composite number , engineering , telecommunications , layer (electronics)
Current designs for the geological disposal of high‐level radioactive waste in Japan use carbon steel overpack containers surrounded by a mixed bentonite/sand buffer material, which will be located in a purpose‐built repository deep underground. Though there are many suitable sites for a repository in Japan, the coastal areas are preferable from a logistical point of view. It is, therefore, important to evaluate the long‐term performance of the carbon steel overpack and the mixed bentonite/sand buffer material in the saline groundwaters of coastal areas. In the current study, the passivation behavior and initial corrosion rates of carbon steel with and without mixed bentonite/sand were tested as a function of the pH and salt concentration in representative saline groundwaters. The main findings indicate that the passivation of carbon steel encapsulated in a buffer material will be unlikely in a saline environment, even at high pH (12), and that the corrosion rate of carbon steel is more strongly affected by the presence of the buffer material than by the salt concentration.