07004 Effects of Surface Preparation Methods and Protective Coating Types on the Performance of Erection Joint Weld Seams in Water Ballast Tanks

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Product Number: 51300-07004-SG

ISBN: 07004 2007 CP

Author: Chung Seo Park, Sung Mo Son, Chil Seok Shin, Mong Kyu Chung and Kwang Ki Baek

Publication Date: 2007

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Ship's water ballast tanks are exposed to the extremely corrosive environments due to immersion or non-immersion by cyclic loading/unloading of ballast water. For cargo oil tankers, the temperature of the ballast tanks walls adjacent to the cargo oil tanks can reach up to 60? and drop to 0? in the cold sea causing higher hostility of corrosive environment. In ageing ships, coating failures, such as cracking, peeling off, are often observed in the areas of erection jointed weld seams and other stress concentrated areas. To improve coating performance of these vulnerable areas, the current surface preparation methods and coating materials for the erection jointed seams of water ballast tanks are evaluated. Three types of surface preparation tool were tested and evaluated in terms of surface profile and subsequent coating performances, such as long term corrosion resistance, crack resistance, rust creepage, cathodic disbondment test, etc. From these results, optimum surface preparation methods and proper coating materials for erection jointed seams of water ballast tanks are proposed.