Degradation effect of carbonation on electrochemical behavior of 2304 duplex stainless steel in simulated concrete pore solutions. (December 2020)

• Record Type: Journal Article
• Authors: Shi, Jinjie; Wu, Miao; Ming, Jing
• Is Part Of: Corrosion science. Volume 177(2020)
• Publication Date: 2020-12
• Subjects: Duplex stainless steel -- Concrete pore solution -- Carbonation -- Chloride -- Passivation -- Corrosion resistance; Corrosion and anti-corrosives -- Periodicals; 620.11223
• DOI: 10.1016/j.corsci.2020.109006
• Languages: English
• ISSNs: 0010-938X

Abstract

Highlights: Carbonation was detrimental for passivation and resulted in thinner passive film of 2304 DSS. Chemical composition of passive films of 2304 DSS was altered by carbonation. Carbonation facilitateed more severe chloride-induced corrosion for 2304 DSS. Abstract: This study described the impact of carbonation on passivation of 2304 duplex stainless steel (DSS) in alkaline solutions simulating concrete pore environment. Also, the chloride-induced corrosion behavior and the pitting corrosion resistance of 2304 DSS were evaluated in carbonated solutions. It was highlighted that the electrochemical performance of 2304 DSS was remarkably affected by carbonation in terms of passivation capability, passive film properties (thickness, morphology and composition) and chloride-induced corrosion morphology. The degradation mechanism of carbonation on passivation of 2304 DSS in alkaline solutions was proposed, as well as the corrosion mechanism induced by combined carbonation and chlorides.