Server maintenance is scheduled for Saturday, December 21st between 6am-10am CST.

During that time, parts of our website will be affected until maintenance is completed. Thank you for your patience.

Menu
Search
Filters
Close
Menu

51312-01511-Realistic approach of corrosion protection of ballast water tanks

Picture for Realistic approach of corrosion protection of ballast water tanks
Available for download
Product Number: 51312-01511-SG
ISBN: 01511 2012 CP
Author: Gabriele Ferrari
Publication Date: 2012
$0.00
$20.00
$20.00
Corrosion protection of ballast water tanks is very precarious because of the aggressiveness of the environment and the difficult accessibility of the areas. Numerous accidents in the past have led to regulatory by the International Maritime Organization (IMO). Regulations include the coatings their application and the pretreatment of the substrate. Practical circumstances in yards during application are often not ideal; therefore it is of interest to investigate if the limits for the parameters which determine the coating performance as fixed by IMO are necessary and realistic. The objective of this study was to verify these limits in particular concerning the presence of shop primer and presence of (in)soluble salts and dust on the shop primer. To simulate the possible circumstances in ballast water tanks different exposure methods have been used: exposure of coated samples to seawater at room temperature cyclic exposure by immersion drying and temperature change. During exposure (up to four weeks) electrochemical measurements such as open corrosion potential and impedance measurements were performed. Moreover current was measured during anodic and cathodic polarization of samples foreseen with a holiday; this is to assess respectively the corrosion propagation and the susceptibility to cathodic delamination. Different commercial coatings have been tested. Results show that presence of intact shop primer (used one from practice) and insoluble salts are beneficial; limits for soluble salt and dust as determined by the regulations are realistic. Results have been verified by in situ inspections in water ballast tanks (ships older than 5 years) together with in situ impedance measurements. The performed laboratory test approach has a potential for standardization. Key words: IMO coatings surface preparation water ballast tanks salts dust electrochemical measurements.
Corrosion protection of ballast water tanks is very precarious because of the aggressiveness of the environment and the difficult accessibility of the areas. Numerous accidents in the past have led to regulatory by the International Maritime Organization (IMO). Regulations include the coatings their application and the pretreatment of the substrate. Practical circumstances in yards during application are often not ideal; therefore it is of interest to investigate if the limits for the parameters which determine the coating performance as fixed by IMO are necessary and realistic. The objective of this study was to verify these limits in particular concerning the presence of shop primer and presence of (in)soluble salts and dust on the shop primer. To simulate the possible circumstances in ballast water tanks different exposure methods have been used: exposure of coated samples to seawater at room temperature cyclic exposure by immersion drying and temperature change. During exposure (up to four weeks) electrochemical measurements such as open corrosion potential and impedance measurements were performed. Moreover current was measured during anodic and cathodic polarization of samples foreseen with a holiday; this is to assess respectively the corrosion propagation and the susceptibility to cathodic delamination. Different commercial coatings have been tested. Results show that presence of intact shop primer (used one from practice) and insoluble salts are beneficial; limits for soluble salt and dust as determined by the regulations are realistic. Results have been verified by in situ inspections in water ballast tanks (ships older than 5 years) together with in situ impedance measurements. The performed laboratory test approach has a potential for standardization. Key words: IMO coatings surface preparation water ballast tanks salts dust electrochemical measurements.
Product tags
Also Purchased
Picture for 00299 COMPREHENSIVE MONITORING AND EVALUATION
Available for download

00299 COMPREHENSIVE MONITORING AND EVALUATION OF BALLAST TANK COATINGS INTEGRITY FOR LIFE PREDICTION AND CONDITION BASED MAINTENANCE

Product Number: 51300-00299-SG
ISBN: 00299 2000 CP
Author: K. E. Lucas, P. F. Slebodnick, E. A. Hogan, E. D. Thomas, A. I. Kaznoff
$20.00
Picture for Study of MIC impact in a full-scale ship ballast tank
Available for download

51312-01246-Study of MIC impact in a full-scale ship ballast tank

Product Number: 51312-01246-SG
ISBN: 01246 2012 CP
Author: Anne Heyer
Publication Date: 2012
$20.00
Picture for 03010 APPROACHES FOR ACHIEVING SUCCESSFUL
Available for download

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

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
$20.00

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.
Categories
Industry
Recently viewed
Popular tags
View all

Association for Materials Protection and Performance

© AMPP All Rights Reserved.
Membership Terms of Content Use
Contact Customer Support