PaintSquare.com
Follow us on Twitter Follow us on LinkedIn Like us on Facebook Follow us on Instagram
Search the site

 

Download our FREE eResource: Specifier's Choice Guide. Get it now.

Problem Solving Forum

| More

April 8 - April 14, 2013

What are the limitations of rust-encapsulating coatings?

More items for Coating Materials


Selected Answers

From eric sinnema of glice naano on April 19, 2013:
     You don't want to encapsulate a problem. You penetrate it to t\he bottom of its morphological depth and passivate the corrosion.After drying, we flame the surface to eliminate oily elements on the surface. Finally, we apply a Si-based nano coating, ion-plasma applied.

From Tom Schwerdt of Texas Department of Transportation on April 18, 2013:
     On the flip side, the structural engineers around here typically don't want pack rust between plates removed too deeply, out of concern the plates will be largely unsupported. The exception is if the plates are being completely pulled off, straightened or replaced and re-bolted.

From Larry Muzia of Exceletech Coating & Applications, LLC on April 15, 2013:
     It becomes a subjective answer. Heavy scale rust is a bad candidate to encapsulate. As an oxide film is porous, it is important to clean and remove trapped contaminants to eliminate/minimize the forces which can increase the driving force to attract the electrolyte. Typically, a barrier-type coating is utilized to overcoat a tightly adhered rust layer, with the intention of eliminating available oxygen and electrolyte. A sufficient film thickness over tightly adhered, contaminant- free rust can provide extended surface life; and I have been involved in projects achieving over a decade of extended service, to include salt warehouses.It is my experience that well adhered rust which is suitably cleaned can be successfully overcoated;  however, emphasis must be placed on correct procedures and proper coating technology.

From Javier Figarella of Ecotek Investments Inc. on April 15, 2013:
     I completly agree. The most secure and ecological and economic way to prevent further corrosión is to totally eliminate rust by chemical methods. Encapsulating rust is the worst thing you can do. Rust converters are the best option when they are applied in concordance whit the right standards

From Michael Beitzel of Modjeski & Masters inc on April 15, 2013:
     Pack rust or crevice corrosion is the cancer of the structural steel life span. No cures are in place except complete removal of the tumor. All the rest is just chemotherapy that at best slows the growth. Hydrophobic coatings appear to be the most effective supplemented with caulking to prevent moisture traps. Even with removal the corrosion-caused cavities formed need to be filled to prevent recurrence of the corrosion.

From Jay Barstow of Aeroflor Coating Services on April 12, 2013:
Encapsulating or impregnating? Big difference! As Per (Scandinavian?) stated above, encapsulation can be a stop-gap measure in hostile environment, whereas impregnation actually creates a hybrid, corrosion resistant material (providing rust is tight and loose scale [and any salt] is removed).

From Per Gabrielsson of Free Lance Consultations and Inspections on April 8, 2013:
     They are there only as "monkey shines," because oxygen and moisture will eventually enter the rust through the coating and expand it - and there you stand with your bare hands and realize that you actually had gained nothing, but extra work.

Please sign in to submit your answer this question    

Tagged categories: Rust; Specialty Coatings


Current PSF Question | Submit a PSF Question | Full PSF Archive

Advertisements
 
PPG Protective and Marine Coatings Group
 
We Protect and Beautify the World
 
PPG is widely recognized as a world leader in protective and marine coatings, developing innovative, cutting-edge products and services.
 

 
BASF
 
New resins from BASF will have metals loving water!
 
Excellent corrosion resistance, low VOC, high gloss, thin films www.basf.us/industrialcoatings dpsolutions@basf.com 800-231-7868
 

 
Carboline Company
 
Carboline is pouring with opportunities
 
We are proud of our exceptional products and services, and believe that people are our greatest asset. Come grow with us!
 

 
Sherwin-Williams
 
Sherwin-Williams General Polymers Resinous Flooring App
 
Our coatings and linings expertise available 24/7, allowing you to explore the Sherwin-Williams systems best suited for your flooring needs. Android Users Click here to Download the app today!
 

 
Mitsubishi Gas Chemical America
 
Performance Amine 1,3-BAC
 
A highly reactive cycloaliphatic diamine offering superior performance. Reasonable cost and curing efficacy makes it suitable for all types of epoxy resin applications.
 

 
Hempel (USA) Inc.
 
Trusted worldwide for advanced protective coatings
 
Trusted worldwide
for advanced
protective, coatings
–Full range of 
  advanced coatings
–Optimised application
–Fast, reliable service  worldwide. Contact us at oilandgas@hempel.com
 

 
Jotun Paints Inc.
 
Jotachar JF750 - The Time Saving Solution
 
The only mesh free solution for jet fire scenarios. Jotachar saves installation time and material costs - the next generation of epoxy passive fire protection.
 

 
Bullard
 
The Next Generation
of Blasting
 
• Lightest
• Coolest
• Most Comfortable
• Most Dependable
 

 
PreTox Products - NexTec, Inc.
 
GOT LEAD? Specify Pretox System products
 
The ONLY Lead Stabilizer Compatible with All Paint Removal Methods. Works with all Blast Media: Grits | Recyclable Abrasives | CO2 | Water | Power Tools | Etc. Call Dave Steffen at 800.338.8296.
 

 
DRYCO
 
Humidity & Temperature Control Equipment
 
Rental Desiccant Dehumidifiers, ArcticDRY Units, Air Conditioners, Heaters and Generators to help control the climate on your next industrial painting project. Nationwide locations, 24/7 service: (866) 379-2600 www.drycogroup.com”
 

 
 
 

Technology Publishing Co., 2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951

TEL 1-412-431-8300  • FAX  1-412-431-5428  •  EMAIL webmaster@paintsquare.com


The Technology Publishing Network

Durability + Design PaintSquare the Journal of Protective Coatings & Linings Paint BidTracker

 
EXPLORE:      JPCL   |   PaintSquare News   |   Interact   |   Buying Guides   |   Webinars   |   Resources   |   Classifieds
REGISTER AND SUBSCRIBE:      Free PaintSquare Registration   |   Subscribe to JPCL   |   Subscribe to PaintSquare News
MORE:      About PaintSquare.com   |   Privacy policy   |   Terms & conditions   |   Site Map   |   Search   |   Contact Us