Corrosion behaviour in concrete of three differently galvanized steel bars |
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| Affiliation: | 1. College of Mechanics and Materials, Hohai University, Nanjing, 210098, PR China;2. National Engineering Research Center of Water Resources Efficient Utilization and Engineering Safety, PR China;3. Engineering Research Center on New Materials and Protection in Hydraulic, Jiangsu Province, 1 Xikang Rd, Nanjing 210098, PR China;4. Jiangsu Testing Center for Quality of Construction Engineering Co., Ltd., 210028, PR China;1. Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar;2. Department of Chemical Engineering, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar;3. Center for Advanced Materials, Qatar University, P.O. Box 2713, Doha, Qatar;4. Sonny Astani Department of Civil and Environmental Engineering, University of Southern California, Los Angeles, CA, USA;5. Department of Civil and Architectural Engineering, College of Engineering, Qatar University, P.O. Box 2713, Doha, Qatar;6. Department of Civil and Environmental Engineering, University of Houston, Houston, TX, USA;7. Department of Civil and Environmental Engineering, University of Houston, Houston, TX, USA;1. School of Material Science and Engineering, South China University of Technology, Guangzhou 510640, China;2. Department of Civil Engineering, Huali College Guangdong University of Technology, Guangzhou 511235, China;1. State Key Laboratory of Advanced Design and Manufacturing for Vehicle Body, Hunan University, Changsha 410082, China;2. Test & Validation Dept. of SAIC Motor Passenger Vehicle Co., SAIC Motor, Shanghai 201804, China;1. Key Laboratory of Marine Environmental Corrosion and Bio-fouling, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;2. Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hung Hom, Kowloon, Hong Kong, China;3. University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: | The increasing use of galvanized steel reinforcements in concrete structures submitted to aggressive environments induces research into innovative zinc coatings with higher corrosion resistance. In this work, several cylindrical concrete specimens were manufactured with two cements of different alkalinity and reinforced with different hot-dip galvanized bars obtained from the “traditional” Zn–Pb bath and from two “modified baths”: Zn–Ni–Bi and Zn–Ni–Sn–Bi. The corrosion rate and corrosion potential of the bars were monitored during the air curing period and during wet–dry exposure both in tap water and in a 5% sodium chloride solution. The results showed that the coatings obtained from Zn–Ni–Sn–Bi bath have the highest corrosion rates, when the aggressiveness of the concrete matrix is determined mainly by its alkalinity. On the contrary, when the corrosion process is determined mainly by the penetration of chlorides (concrete manufactured with cement having a low alkali content) Zn–Ni–Sn–Bi was attacked only when the chloride concentration at the concrete cover depth reached the threshold of 4.02% (by weight of cement), which is higher than those necessary for the attack of the other coatings studied (1.36% for Zn–Ni–Bi, 1.73% for Zn–Pb). |
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