The combined effect of carbonation and chloride-contamination of concrete on the intelligence of Mg alloy sacrificial anode for reinforcing steel

Wu，Peng Peng1; Song，Guang Ling1,2,3,4; Zhu，Yi Xing1; Zheng，Da Jiang1

2022-08-01

10.1016/j.mtcomm.2022.103977

Materials Today Communications   Impact Factor & Quartile

2352-4928

Reinforced concrete infrastructure may be simultaneously exposed to concentrated sodium chloride and carbon dioxides in some cases, and the reinforcing steel may suffer severe corrosion due to the combined effect of carbonation and chloride (Cl) contamination of the concrete. To better understand the combined effect of carbonation and Cl contamination, the cathodic protection performance of AZ91 Mg alloy was compared with that of the widely used conventional Al and Zn sacrificial anodes for the steel in simulated concrete pore solutions (SCPSs) in this work. The results showed that the Al and Zn were not sensitive to the corrosivity variation of the SCPS caused by the Cl contamination and carbonation, and the Zn could not sufficiently protect the steel in Cl-contaminated SCPSs. However, the AZ91 Mg alloy could sensitively respond to the corrosivity change of the SCPS, be activated automatically by the Cl contamination and carbonation, give out a sufficient cathodic current density to protect the steel according to the corrosivity of the SCPS, and act as an intelligent sacrificial anode for reinforced concrete in some environments with concentrated CO and Cl. Based on the different anodic behaviors, the dissolution mechanisms of the Al, Zn and AZ91 Mg alloy were analyzed and the combined effect of the carbonation and Cl contamination on the cathodic protection performance of these anodes were investigated.

Carbonation Chloride contamination Mg alloy Reinforced concrete Sacrificial anode

SCI ; EI

English

Others

National Natural Science Foundation of China[51671163];National Natural Science Foundation of China[51731008];

Materials Science

Materials Science, Multidisciplinary

WOS:000837061600002

ELSEVIER

20223012411140

Aluminum ; Anodes ; Aquifers ; Carbon dioxide ; Carbonation ; Cathodic protection ; Contamination ; Magnesium alloys ; Sodium chloride ; Steel corrosion ; Zinc alloys

Concrete:412 ; Groundwater:444.2 ; Metals Corrosion:539.1 ; Corrosion Protection:539.2 ; Aluminum:541.1 ; Magnesium and Alloys:542.2 ; Steel:545.3 ; Zinc and Alloys:546.3 ; Alkaline Earth Metals:549.2 ; Electron Tubes:714.1 ; Chemical Reactions:802.2 ; Inorganic Compounds:804.2

2-s2.0-85134688597

Scopus

1.Center for Marine Materials Corrosion and Protection,College of Materials,Xiamen University,Xiamen,422 S. Siming Rd,361005,China
2.Department of Ocean Science and Engineering,Southern University of Science and Technology,Shenzhen,10088 Xueyuan Rd,518055,China
3.State Key Laboratory of Physical Chemistry of Solid Surfaces,Xiamen University,Xiamen,422 S. Siming Rd,361005,China
4.School of Engineering,the University of Queensland,St.Lucia,4068,Australia

Wu，Peng Peng,Song，Guang Ling,Zhu，Yi Xing,et al. The combined effect of carbonation and chloride-contamination of concrete on the intelligence of Mg alloy sacrificial anode for reinforcing steel[J]. Materials Today Communications,2022,32.

Wu，Peng Peng,Song，Guang Ling,Zhu，Yi Xing,&Zheng，Da Jiang.(2022).The combined effect of carbonation and chloride-contamination of concrete on the intelligence of Mg alloy sacrificial anode for reinforcing steel.Materials Today Communications,32.

Wu，Peng Peng,et al."The combined effect of carbonation and chloride-contamination of concrete on the intelligence of Mg alloy sacrificial anode for reinforcing steel".Materials Today Communications 32(2022).