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Coating Performance Over Partially Blasted Surfaces

Coating Performance Over Partially Blasted Surfaces
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Common methods of maintenance painting either involve complete removal of existing paint (SSPC-SP 10) or localized preparation using power tools (SSPC-SP 3). Sometimes an intermediate level of surface preparation may be performed by allowing intact tightly adherent coating to remain. Abrasive blasting may be used to prepare either localized areas, or to partially prepare the entire surface, allowing well-adhered aged coating to remain. 

Product Number: 51219-180-SG
Author: Patrick Cassidy, Peter Ault, Cameron Miller , Colton Spicer
Publication Date: 2019
Industries: Military , Coatings
$0.00
$20.00
$20.00

Common methods of maintenance painting either involve complete removal of existing paint (SSPC-SP 10) or localized preparation using power tools (SSPC-SP 3). Sometimes an intermediate level of surface preparation may be performed by allowing intact tightly adherent coating to remain. Abrasive blasting may be used to prepare either localized areas, or to partially prepare the entire surface, allowing well-adhered aged coating to remain. The Navy began investigating this process in the early 2000’s for use on surfaces coated with ultra-high solids (UHS) coatings, which are known to be very difficult and time consuming to remove. As these “partial blasting” or localized preparation initiatives have been shown to reduce rework burden and increase productivity, there is a need to quantify and clarify a few outstanding issues: (a) anticipated service life of a new coating applied over retained, aged coating; (b) specific characteristics of the retained coating which do and do not pose performance risks (e.g., fracturing, profile characteristics, soluble materials, etc.); (c) amenable coatings/ship locations where the use of partial blasting will be of the most cost avoidance. Interim results show that a “partial blast” surface preparation is an effective process to maintain an aged coating in reasonably good condition as long as the procedures and lessons learned outlined within the program are followed. This will involve the proper training of both abrasive blasters and coating inspectors. Coating systems installed over partial blasting have been shown to perform well in the short term (i.e., catastrophic failures have not been observed), and testing is ongoing. Full integration and implementation can be achieved by working with industry and the Navy community to define the process and proper training.

Common methods of maintenance painting either involve complete removal of existing paint (SSPC-SP 10) or localized preparation using power tools (SSPC-SP 3). Sometimes an intermediate level of surface preparation may be performed by allowing intact tightly adherent coating to remain. Abrasive blasting may be used to prepare either localized areas, or to partially prepare the entire surface, allowing well-adhered aged coating to remain. The Navy began investigating this process in the early 2000’s for use on surfaces coated with ultra-high solids (UHS) coatings, which are known to be very difficult and time consuming to remove. As these “partial blasting” or localized preparation initiatives have been shown to reduce rework burden and increase productivity, there is a need to quantify and clarify a few outstanding issues: (a) anticipated service life of a new coating applied over retained, aged coating; (b) specific characteristics of the retained coating which do and do not pose performance risks (e.g., fracturing, profile characteristics, soluble materials, etc.); (c) amenable coatings/ship locations where the use of partial blasting will be of the most cost avoidance. Interim results show that a “partial blast” surface preparation is an effective process to maintain an aged coating in reasonably good condition as long as the procedures and lessons learned outlined within the program are followed. This will involve the proper training of both abrasive blasters and coating inspectors. Coating systems installed over partial blasting have been shown to perform well in the short term (i.e., catastrophic failures have not been observed), and testing is ongoing. Full integration and implementation can be achieved by working with industry and the Navy community to define the process and proper training.

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The United States Army and Marine Corps (USMC) paint their vehicles with the Chemical Agent Resistant Coating (CARC) system. This system consists of a pretreatment, an epoxy primer, and polyurethane topcoat, similar to many other industrial paint systems, but with added functional requirements (e.g., chemical agent resistance, camouflage, and signature reduction) unique to these paints. The systems that utilize these coatings are also designed for specific capabilities, of which corrosion is usually a lower priority. Lastly, the vehicles and equipment of the Army and USMC typically operate in harsh environments, which are highly corrosive. 
Effect of Feathering on Coating Performance
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Effect of Feathering on Coating Performance

Product Number: 51219-181-SG
Author: Patrick Cassidy, Michael Kibler
Publication Date: 2019
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Feathering is the process of tapering or blending-in an existing intact coating in preparation of applying a new repair coating. This industry common practice is intended to ensure good adhesion of the repair coating to the legacy coating, and to provide a seamless aesthetic transition for areas where maintenance painting is performed. There are no industry standard requirements for performing feathering, resulting in most specifications having their own unique definition. 
00615 INSPECTION AND INTERPRETATION USING JOINT STANDARD NACE NO. 5/SSPC SP-12
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00615 INSPECTION AND INTERPRETATION USING JOINT STANDARD NACE NO. 5/SSPC SP-12

Product Number: 51300-00615-SG
ISBN: 00615 2000 CP
Author: R.P. Negrey
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Conference Paper - This paper describes the requirements of the standard, additional inspection points, and several uses of the standard in the field where clear specification language was imperative to successful project completion. NACE 5/SSPC-SP 12 standard confined to water jetting - which makes use of ultra-high pressure water that is nonabrasive.  Four levels of visible post-cleaning condition and three levels of non-visible condition are defined.
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