跨海大桥钢管桩腐蚀模拟试验及耐久性跟踪研究

Simulation Test of Corrosion and Follow-up Study of Durability of Steel Pipe Piles for Cross-sea Bridge

通过模拟试验,研究了3种不同类型的钢管桩样片在杭州湾海域5种环境分区中的腐蚀形态和电信号反馈。实验结果表明,涂敷环氧粉末涂层的钢管桩样片表面基本没有腐蚀,涂层完好无损,而其他钢管桩样片则出现不同程度腐蚀,其中浪溅区腐蚀最严重,泥下区腐蚀较轻微;腐蚀电位逐渐变负,随后出现稳态,最后趋向于零;浪溅区腐蚀电位最负,泥下区腐蚀电位最正;相同环境中,涂敷环氧涂层的样片腐蚀电位比其他样片更正,有焊缝样片腐蚀电位比无焊缝样片稍负。

The corrosion morphologies and feedbacks of electrical signals of 3 different kinds of steel pipe piles in 5 environmental zones of Hangzhou Bay are studied through simulation test. The result shows that, it has nearly no corrosion on the surface of epoxy powder coated steel pipe piles while varying degrees of corrosion appears on the others. The corrosion of the steel pipe piles exposed in splash zone is the most serious while those covered in the sea mud have relatively light corrosion. The corrosion potential gradually becomes negative, then goes steady, and finally tends to zero. the corrosion potentials of the steel pipe piles in splash zone are the most negative while those in mud zone are the most positive. Compared in the same environment, the corrosion potential of epoxy powder coated steel pipe piles is more positive than others. And the corrosion potential of the steel pipe piles with weld is slightly more negative than that with no weld.