A chloride-sensitive corrosion sensor and protector made of an optimized Mg-Al alloy for reinforcing steel. (15th November 2021)

• Record Type: Journal Article
• Authors: Yan, Lei; Song, Guang-Ling; Wu, Pengpeng; Zhu, Yixing; Zheng, Dajiang
• Is Part Of: Materials & design. Volume 210(2021)
• Publication Date: 2021-11-15
• Subjects: Mg alloy -- Reinforcing steel -- Mortar -- Sensor -- Cathodic protection -- Corrosion; Materials -- Periodicals; Engineering design -- Periodicals; Matériaux -- Périodiques; Conception technique -- Périodiques; Electronic journals; 620.11
• DOI: 10.1016/j.matdes.2021.110028
• Languages: English
• ISSNs: 0264-1275

Abstract

Graphical abstract: Highlights: The Mg-Al alloy with 17 wt% Al is the best corrosivity sensor and corrosion protector. Excessive Al content in the Mg-Al alloy triggers hydrogen embrittlement of steel. The corrosion mechanism of the Mg-Al alloy changes with increasing Al content. The intelligence level of the Mg-Al alloy may be modified by its surface area . Abstract: The smart detection of concrete-corrosivity and the intelligent protection of reinforcing steel provided by Mg alloys with various Al contents were systematically investigated in a reconstituted concrete pore solution (RCPS). The results indicated that increasing the Al concentration of the alloy up to 17 wt% could enhance the performance of corrosivity-detection and the corrosion-protection. However, excessive Al alloying could lead to an over-protection of the steel. The optimized Mg-Al alloy sensing and protecting anode was also verified in mortar prisms. Based on these findings, the anodic behaviors of Mg-Al alloys in the RCPS were analyzed.