Open AccessA Novel Self-Healing Conversion Film Formed on Rebar in Solution Containing Cerium and Molybdenum Ions
Author(s) -
Hongze An,
Donatien Ngendabanyikwa,
Guozhe Meng,
Yanqiu Wang,
Junyi Wang,
Bin Liu,
Fuhui Wang
Publication year - 2022
Publication title -
journal of the electrochemical society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.258
H-Index - 271
eISSN - 1945-7111
pISSN - 0013-4651
DOI - 10.1149/1945-7111/ac453f
Subject(s) - rebar , cerium , molybdenum , materials science , chloride , layer (electronics) , ion , corrosion , pitting corrosion , chemical engineering , composite material , metallurgy , chemistry , organic chemistry , engineering
A novel conversion film containing cerium and molybdenum was synthesized on the rebar surface, and then the pitting sensitivity of the rebar was improved in a concrete environment containing chloride. This conversion film presented a two-layer structure, which involved CeMoO x as the outer layer and FeO x as the inner layer. The film with two-layer structure exhibited a strong corrosion resistance after being immersed in an alkaline environment (pH = 12.5) added with 0.1 M NaCl, and the charge transfer resistance ( R t ) could reach 5.88 × 10 6 Ω·cm 2 after immersion for 1600 h, which was approximately 2.5 times the initial R t value. Moreover, it was found that the film has a self-heal property when being damaged beyond the pitting potential. The anticorrosion mechanism of the film and its self-healing mechanism were discussed in depth in this study.