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Corrosion performance of zinc coated steel in seawater environment
- Liu, Shuan, Zhao, Xia, Zhao, Haichao, Sun, Huyuan, Chen, Jianmin
- Chinese journal of oceanology and limnology 2017 v.35 no.2 pp. 423-430
- carbonates, corrosion, dielectric spectroscopy, durability, marine resources, pH, seawater, steel, zinc, zinc oxide
- Considering the continuous exploitation of marine resources, it is very important to study the anticorrosion performance and durability of zinc coated streel (ZCS) because its increasing use as reinforcements in seawater. Tafel polarization curves and linear polarization curves combined with electrochemical impedance spectroscopy (EIS) were employed to evaluate the corrosion performance of ZCS at Qingdao test station during long-term immersion in seawater. The results indicated that the corrosion rate of the ZCS increased obviously with immersion time in seawater. The corrosion products that formed on the zinc coated steel were loose and porous, and were mainly composed of Zn₅(OH)₈Cl₂, Zn₅(OH)₆(CO₃)₂, and ZnO. Pitting corrosion occurred on the steel surface in neutral seawater, and the rate of ZCS corrosion decreased with increasing pH.