Corrosion performance of zinc coated steel in seawater environment

• Published in: Chinese journal of oceanology and limnology 2017-03, Vol.35 (2), p.423-430
• Main Author: 刘栓 赵霞 赵海超 孙虎元 陈建敏
• Format: Article
• Language: English
• Subjects: Analytical methods; Chemical analysis; Chemistry; Coatings; Corrosion; Corrosion prevention; Corrosion products; Corrosion rate; Earth and Environmental Science; Earth Sciences; Electrochemical impedance spectroscopy; Electrochemistry; Immersion; Linear polarization; Marine; Marine environment; Marine resources; Oceanography; Performance evaluation; Pitting (corrosion); Polarization; Seawater; Spectroscopy; Steel; Submerging; Water analysis; ZCS; Zinc; Zinc coatings; Zinc oxide; 海水环境; 海洋资源; 浸泡时间; 电化学阻抗; 腐蚀性能; 镀锌钢; 防腐性能
• ISSN: 0254-4059; 2096-5508; 1993-5005; 2523-3521
• DOI: 10.1007/s00343-016-5269-9

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）8C12, 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.