Journal
CORROSION SCIENCE
Volume 190, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.corsci.2021.109669
Keywords
Reinforcing steel; Red mud; Passive film; Chloride-induced corrosion; Concrete pore solution
Funding
- National Natural Science Foundation of China [51678144]
- Southeast University Zhongying Young Scholars Project
- Fundamental Research Funds for the Central Universities [2242021R41142]
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Red mud (RM) has a detrimental effect on the passivation of steels, leading to the formation of defective and thinner passive films. Despite this, RM plays a beneficial role in preventing chloride-induced depassivation and corrosion propagation.
The influence of red mud (RM) on electrochemical behaviour, chemical composition, surface morphology and thickness of passive films naturally formed on low-carbon steel and 2304 stainless steel in alkaline concrete pore solutions was investigated using electrochemical measurements, XPS, AFM and SEM/EDS. Furthermore, chloride-induced pitting corrosion of passivated steels was characterized with and without RM. Results show that RM was detrimental to the passivity of steels by forming defective passive films with reduced thickness. Despite the formation of a less protective passive film on low-carbon steel, beneficial role of RM was highlighted in preventing chloride-induced depassivation and corrosion propagation.
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