Cathodic Protection/Partial Coatings Versus Complete Coatings in Tanks.

摘要

The purpose of ship ballast tanks are one of the most costly, time delaying components of new ship construction. In addition, ballast tanks are one of the most severe corrosion areas during ship operations and as a result, contribute significantly to high maintenance cost and ship nonavailability. The 023-1 Panel of SNAME recognized these problems and selected a research and development project to investigate alternate, cost effective corrosion control solutions. Four approaches were selected for meek-up ballast tank testing and 20 year life cycle cost analysis. Completely coated tanks with high performance coatings *Partially coated tanks with cathodic protection Soft coatings with cathodic protection *Preconstruction primer with cathodic protection Of of the systems evaluated, the preconstruction primer with cathodic protection was the best performer, least expensive initially and least expensive over the 20 year economic life of the ship. Partial coatings with cathodic protection performed as well as complete matings and were more cost effective. The soft coatings performance with cathodic protection was suspect. Five of the six screened soft coating systems either failed or marginally passed. Certain prerequisites were also found to be necessary to assure cathodic protection performance. Tanks must be pressed-up water ballast. successful With salt In conclusion, this project achieved all project goals. Identification was made of ballast tank corrosion protection approaches which are effective in mitigating corrosion and yet save new instruction and operating dollars.