压载水舱阴极保护设计与保护效果评价

Design of Cathodic Protection and Evaluation of Protection Efficacy for Ballast Tank

船舶压载水舱的腐蚀控制采用涂层和牺牲阳极阴极保护结合的防腐蚀技术。采用常规设计方法进行了牺牲阳极阴极保护的设计。通过模拟试验获得了相应的边界条件,利用BEASY软件进行阴极保护效果的数值模拟,并评价设计方案的有效性。结果表明,设计方案合理,牺牲阳极布置方案可行,阴极保护系统的薄弱点在底部与侧壁的交界处以及侧壁未安装牺牲阳极的区域。

Coating combined with sacrificial anode-type cathodic protection was used as a joint corrosion-prevention technique to control the corrosion of ballast tanks of ships. Conventional design methods were thus adopted for designing sacrificial anode-type cathodic protection, and the boundary conditions were determined based on simulation tests. At the same time, BEASY software was used to carry out numerical simulation of the efficacy of cathodic protection, and the feasibility of the designing plan was also discussed. Results indicated that the design plan was rational, and the plan for the arrangement of the sacrificial anodes was feasible. Moreover, the insufficiently protected areas of the cathodic-protection system included the joints between the bottom and the side walls and those side-wall zones without sacrificial anodes.