海洋工程用新型牺牲阳极设计与性能研究(Ⅳ)——导管架平台阴极保护应用研究

摘要

Objective To design a new type sacrificial anode by configuration optimization to increase the current output in the initial stage when it has the similar quality to that of conventional anode, to rapidly polarize the cathode to the protection interval. In the late stage, the current is going to be reduced, to meet the needs of the average and the end protection current demand, and achieve the purpose of saving sacrificial anode. Methods Two wings were added in both sides of the traditional anode, to reduce the water-resistance and increase the initial current. The rapid dissolution of the wings reduced the surface area rapidly and also the current output. Results For new type anode with similar qualities with the conventional anode, the initial current outputs increased by more than 30%, much higher than the designed value of 10%. After the initial polarization, the current outputs of the new type anode were rapidly reduced to the level equivalent to the conventional anode. Conclusion According to the test results, the cathodic protection design of jacket platform can achieve the purpose of saving sacrificial anode.%目的 通过构型优化设计了一种新型牺牲阳极,使其在与常规阳极质量相当的前提下,增加初期发生电流,使被保护体较快极化到保护电位,后期发生电流降低,满足平均和末期保护电流需要,达到节约牺牲阳极用量的目的.方法 在传统梯形阳极两侧增加两个翼翅,降低接水电阻,增加初期发生电流.翼翅优于本体快速溶解,其表面积迅速减小,发生电流随之降低.结果 质量与常规阳极相近的新型阳极,初期发生电流增加30%以上,远高于设计值10%,初期极化完成后,新型阳极发生电流快速降低,达到与常规阳极相当的发生电流.结论 据此试验结果对导管架平台水下结构进行阴极保护设计,可达到节约牺牲阳极用量的目的.