Improvement of intelligent corrosivity-detection and corrosion-protection for reinforcing steel

• Published in: Corrosion science Vol. 184; p. 109396
• Main Authors: Wu, Peng-Peng, Song, Guang-Ling, Zhu, Yi-Xing, Yan, Lei, Feng, Zhen-Liang, Zheng, Da-Jiang
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier Ltd 15.05.2021; Elsevier BV
• Subjects: A. Mg-Al alloy; A. Reinforced concrete; A. Sacrificial anode; Alloying effects; Aluminum; B. Anodic polarization; B. EIS; C. Cathodic protection; C. Passivity; Corrosion; Corrosion effects; Corrosion prevention; Dissolution; Intelligence; Magnesium base alloys; Magnetron sputtering; Reinforcing steels; B. Anodic polarization; A. Reinforced concrete; A. Mg-Al alloy; C. Passivity; A. Sacrificial anode; B. EIS; C. Cathodic protection
• ISSN: 0010-938X; 1879-0496
• DOI: 10.1016/j.corsci.2021.109396

•The intelligence of corrosivity-detection and corrosion-protection by Mg can be improved through proper Al alloying.•A Mg-based alloy with a high Al content is ideal for the intelligent corrosivity-detection and smart corrosion-prevention.•The intelligent Mg-Al corrosivity-detector and smart corrosion-protector must have a chloride-sensitive breakdown potential.•Although Al or an Al-based alloy is too active in a strong alkaline solution, Al alloying can enhance Mg passivity. A series of Mg-Al alloys were fabricated by means of magnetron-sputtering, aiming to improve the intelligence of Mg as a smart concrete corrosivity-detector and corrosion-protector. The effect of Al alloying on Mg dissolution in a simulated concrete pore solution (SCPS) without and with Cl− contamination was systematically investigated. The results showed that proper Al alloying could significantly enhance the intelligence of Mg in corrosivity-detection and corrosion-protection by reducing the self-dissolution, avoiding the over-protection, sensitively probing increased corrosivity, and effectively protect the steel activated by chlorides.