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Mechanisms of corrosion and cathodic delamination resulting from the cracking of paint in a water ballast tank environment and what may be expected in the corrosive environment. This will be based on the concept of a thermodynamic barrier existing at the coating/steel interface.
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Currently the shipbuilding industry is seeking to minimize to improve corrosion protection provided to the structures which comprise the Water Ballast Tanks (WBT’s) of a vessel. At the design stage two factors could reduce the carbon footprint of the coating process through life material selection and optimizing the structural design to facilitate the coating process and maintenance processes. Thus, the design stage exerts considerable influence on these two elements and can determine the through life costs and environmental penalties of maintaining the structure.
In this study, a new portable garnet blasting unit targets for weld joints in W.B.T. was developed. The field data clearly indicated that the potable garnet blasting method can be a valuable tool for small damaged area and weld seam in confined area with increase in the blasting productivity by 20%. In order to predict and optimize the pressure drop and air consumption in air blasting system, semi-empirical equations have been developed
In new shipbuilding industries, conventional solvent-born coatings require longer curing period at low temperature season, which creates the needs for fast curing coatings to meet work schedule. In this study, several kinds of solvent free rapid cure epoxy coatings and polyurea coatings were evaluated in terms of feasibility for ship’s water ballast tanks (WBT).
The presentation reports about a nationally funded 3-year R&D project on the effects of edge geometry and coating type on the corrosion protection performance of organic coatings on edges with particular attention to ballast water tank applications. Core of the presentation is the description of the testing scenarios, the introduction of three assessment methods, and the discussion of the results. Testing methods included the long-term testing of samples in a specially designed IMO chamber, the utilization of electric impedance spectroscopy and DFT measurements on polished cross sections of coated edges.