LONG TERM PERFORMANCE OF CORROSION PREVENTION COUNTERMEASURES FOR MARINE STEEL STRUCTURES

Abstract

It is indispensable to use corrosion prevention countermeasures for marine steel structures. In order to evaluate the long term performance of corrosion prevention methods, it is most reliable at this moment to continue the periodical monitoring of corrosion prevention performance of full scale marine steel structures. The authors have been monitoring time-dependent change of corrosion prevention effects of several kind of corrosion prevention methods. From the ten years monitoring, the following results were obtained. (1) Most methods show good performance (2) Protection cover should be enough against wave force (3) Zinc-rich undercoating is necessary for painting system (4) Electro-chemical monitoring methods need to be improved.