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03010 APPROACHES FOR ACHIEVING SUCCESSFUL HIGH BUILD COATINGS ON SHARP EDGES IN SHIP'S BALLAST TANKS

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In ship's ballast tanks, most of coating failures (and corrosion attacks) were observed on sharp steel edges, welds seams and weld spatters. One solution is to employ high solid coating material with less tendency to flow away from edges. In this study, two coatings  are selected and evaluated in terms of their edge retention ability.

Product Number: 51300-03010-SG
ISBN: 03010 2003 CP
Author: M. K. Chung, C. S. Park, C. H. Lee, K. K. Baek
Publication Date: 2003
Industry: Coatings and Linings
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In ship's ballast tanks, most of coating failures (and corrosion attacks) were observed on sharp steel edge, welds seams and weld spatters. To achieve a proper coating film on sharp edges, application of a stripe coat using brushes or roller is often used, whereas alternative methods of mechanical grinding are also employed. This, however, requires high labor cost not to mention of the uncertainly of the final results. One of the possible approaches is to employ high solid coating material having less tendency to flow away from edges after application. With this approach, the need for smoothed edge is greatly reduces, and sometimes eliminated, with high solids coatings, thus reducing the cost and time invested in surface preparation. In this study, two coatings with different solid content are selected and evaluated in terms of their edge retention ability. In each coating the coating film thickness profile around the edge and solid content of coating materials were evaluated. The result suggested that the paint with lower surface tension as well as smaller surface tension differential during its curing stage, not the one with higher solid content would yield a better edge retention in the actual application. The current result clearly indicates that to achieve a proper edge coverage in painting applications, a proper selection of paint is, as important as to prepare proper edge roundness.

Keywords: water ballast tank, edge retention, high solids coatings, surface tension, solid content

In ship's ballast tanks, most of coating failures (and corrosion attacks) were observed on sharp steel edge, welds seams and weld spatters. To achieve a proper coating film on sharp edges, application of a stripe coat using brushes or roller is often used, whereas alternative methods of mechanical grinding are also employed. This, however, requires high labor cost not to mention of the uncertainly of the final results. One of the possible approaches is to employ high solid coating material having less tendency to flow away from edges after application. With this approach, the need for smoothed edge is greatly reduces, and sometimes eliminated, with high solids coatings, thus reducing the cost and time invested in surface preparation. In this study, two coatings with different solid content are selected and evaluated in terms of their edge retention ability. In each coating the coating film thickness profile around the edge and solid content of coating materials were evaluated. The result suggested that the paint with lower surface tension as well as smaller surface tension differential during its curing stage, not the one with higher solid content would yield a better edge retention in the actual application. The current result clearly indicates that to achieve a proper edge coverage in painting applications, a proper selection of paint is, as important as to prepare proper edge roundness.

Keywords: water ballast tank, edge retention, high solids coatings, surface tension, solid content

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01428 INSPECTION OF HOT DIP GALVANIZED ARTICLES

Product Number: 51300-01428-SG
ISBN: 01428 2001 CP
Author: Thomas J. Langill
Publication Date: 2000
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Hot dip galvanizing steel articles after fabrication is one of the most widely used methods to provide corrosion protection. As a final step in the process, the hot dip galvanized coating is inspected for compliance with specifications. Correct measurement techniques and accurate interpretation of the results are necessary to provide an acceptable hot dip galvanized coating.
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Product Number: 51300-03029-SG
ISBN: 03029 2003 CP
Author: Brian J. Fitzgerald, Peter Lazar III, Robert M Kay, Stefan Winnik
Publication Date: 2003
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Corrosion Under Insulation (CUI) in pipingc systems consumes a significant percent of the maintenance budget in the petrochemical industry. Prevention of CUI by the use of (1) thermal spray aluminum, (2) stainless steel pipe, (3) expanded metal cages for personnel protection instead of insulation and (4) aluminum foil wrapping are discussed in terms of long term protection, installed cost and Life cycle cost.
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Product Number: 51300-05002-SG
ISBN: 05002 2005 CP
Author: Michael J. Mitchell, International Protective Coatings
Publication Date: 2005
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This paper will consider the performance and relevance to static situations of the key types of Cathodic dip painting (CDP) Antifoulings (Rosin Modified types), the current tin free polishing types (typically acrylates of various types), and low energy surface types. Both field experience and laboratory work will be considered.
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