温度对舰船阴极保护和腐蚀静电场的影响

Influence of temperature on the cathodic protection and corrosion electrostatic field of ships

海水中氧溶解量和海水电导率是影响海水腐蚀性能的重要因素,而这两个因素主要取决于海水的盐度和温度。采用边界元法建立舰船外加电流阴极保护和腐蚀静电场模型,研究不同海水温度下氧溶解量、电导率及氧的扩散系数对舰船腐蚀防腐静电场的影响。结果表明,腐蚀电场峰值随着温度的升高而减小,当两对阳极输出电流分别为13.5A和8A时,船体和舵在低温处于过保护状态而在高温处于欠保护状态,螺旋桨和轴在不同温度下均能得到较好的保护。

Oxygen concentration and seawater conductivity are important factors affecting the corrosion behavior in seawater,and these two factors mainly depend on salinity and temperature of seawater.The model of impressed current cathodic protection and corrosion electrostatic field was established by using the boundary element method.The effects of oxygen concentration,seawater conductivity and diffusion coefficient of oxygen on the corrosion related electrostatic field of the ship at different seawater temperatures were studied.The results show that the peak value of the corrosion electrostatic field decreases with the increase of temperature.When the output current of the two pairs of anodes are 13.5 A and 8 A,respectively,the hull and the rudder are in over-protection at low temperatures and under-protection at high temperatures accordingly,but the propeller and the shaft get perfect protection at all temperatures.