海水流动对A3钢腐蚀速度的影响

Effect of flow velocity of seawater on corrosion rate for A3 steel

为了定量考察海水的流动对钢铁材料在海水中的腐蚀速度的影响,通过室内和实海挂片失重测试比较了A3钢在静止和流动海水中的腐蚀速度差异,并在控制流速条件下使用动电位法测试了A3钢的腐蚀速度,同时测试了不同流速海水中的环境参量。室内和实海挂片失重测试比较结果表明,海水流动能够加快A3钢在海水中的腐蚀速度,腐蚀初期尤其明显。在控制流速条件下采用动电位极化方法测试了腐蚀初期A3钢的腐蚀速度,并且通过拟合处理得到了海水流动对其腐蚀速度影响因子的表达式。

In order to investigate the effect of seawater velocity on corrosion rate of steel, weight loss test of A3 steel in lab and field site was conducted to show the corrosion rate data in quiescent and flowing seawater for comparison. Potentiodynamic technique was also used to evaluate corrosion rate in different flow velocities. At the same time, some environmental parameters were measured. Results of weight loss in lab and field site show that corrosion rate of A3 steel can be accelerated flow of seawater, especially in the initial stage. Potentiodynamics was also used to measure initial corrosion rate for A3 steel at different flow velocity. Then the expression of velocity factor, which reflects the effect of velocity on corrosion rate, was obtained by mathematic simulation.