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在本文中推导和验证了低合金钢在海水中的氧浓差腐蚀方程。方程表明,在电池的阴极和阳极上,铁的阳极极化过电位差值,是影响氧浓差腐蚀过程的重要因素。随着过电位差值的增大,氧浓差电流从小变大而到达极限值。同时氧浓差电流密度的对数值与阴、阳极面积比的对数值关系也从曲线转为直线。根据方程判断,氧浓差电池使低合金钢在海水中发生局部腐蚀的必要条件是:铁在阴极和阳极上的阳极极化过电位差值必须大于铁在阳极和阴极上平衡电位的差值。
In this paper, the oxygen concentration corrosion equation of low alloyed steel in seawater is deduced and verified. The equation shows that anodic polarization overpotential of iron at the cathode and anode of the cell is an important factor that affects the oxygen concentration corrosion process. With the increase of overpotential, the oxygen concentration current becomes larger and reaches the limit value. At the same time, the logarithm of the oxygen concentration current density and the logarithm of the anodic and anodic area ratios also changed from the curve to the straight line. According to the equation, the necessary conditions for local corrosion of low-alloy steel in seawater due to the oxygen concentration cell are that the difference in anode polarization between the cathode and the anode must be greater than the difference in equilibrium potential between the anode and the cathode of iron .