PaintSquare.com
      | Connect Follow us on Twitter Like us on Facebook
About | Subscribe | Advertise
  

 

Download our free Transmission Pipeline Coating Systems eResource Book

Problem Solving Forum

| More

March 3 - March 7, 2014

Which single type of paint system can be used to protect both stainless steel and carbon steel welded together?



More items for Coating Materials


Selected Answers

From William slama of International Paint/Ceilcote Products on March 6, 2014:
This combination is an example of the basic galvanic driver of corrosion. The anode can be sacrificed if current flow is available. That depends on the conductivity of the electrolyte (the fluid in the vessel) and the geometry (amount of cathode area vs. anode area and the distance between). A typical situation presents when the vessel has components that are carbon steel and other electrically bonded (welded) components of a more noble alloy. The carbon steel surfaces need to be coated/lined to protect against corrosion. Corrosion engineers learned long ago that the significant area of exposed alloy would cause high current flow to a single imperfection (i.e. pinhole) in the steel coating. The result would be a very rapid corrosion, literally “drilling” a hole through the steel because of the larger area of exposed alloy and small area of exposed carbon steel. For that reason, the alloy surfaces are also coated to reduce or eliminate the potential galvanic current flow. However, experience with high build linings has not shown this to be a problem as could occur with thinner coating systems, and it is very common to line only the carbon steel surfaces and just lap the lining a few inches onto the alloy. In some cases, vessels are specified and constructed of alloy believed to be suitable for the intended chemical environment, only to learn later that the selected alloy was not able to withstand the actual chemical conditions. In those cases, the entire alloy vessel would then be lined with a suitable lining (epoxy, vinyl ester, etc.). As Mr. Albertoni indicated, it is important to achieve the correct surface prep on the alloy surface, just as it is necessary for carbon steel surfaces. The blast media and pressure may need to be selected for best results. The typical requirement is a minimum 3 mil sharp profile, SSPC-SP 5 or SP 10.

From James Albertoni of CA Department of Water Resources on March 5, 2014:
I am assuming this is for a submerged application, or else there would be no reason to coat the stainless other than aesthetics. We typically use epoxies for this application with decent results. Generally, the stainless steel needs a fairly deep profile, and you can expect the coating to fail on the stainless quicker than the carbon steel. The reason we do this is to prevent accelerated corrosion of the carbon steel and to minimize the current drain the bare stainless steel would provide.

Please sign in to submit your answer this question    

Tagged categories: Carbon Steel; Stainless steel


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

Carboline Company
Submit your Resume Now
carboline.com/careers

Carboline is in need of people who are entrepreneurial, competitive, self-motivated, and have a winner's attitude. Click the above link for available opportunities.


BASF
New resins from BASF will have metals loving water:

Excellent corrosion resistance, low VOC, high gloss, thin films basf.us/industrialcoatings
polyorders@basf.com
800-231-7868


Wasser High-Tech Coatings Inc.
Wasser Coatings Protect

Wasser Coatings offer a complete range of Moisture Cure Urethane (NEPCOAT approved) systems in addition to Polyurea membranes and linings(NSF).
www.wassercoatings.com


Jessup Manufacturing Company
More Traction for Extreme Marine Conditions

Jessup Safety Track® 3800 Military Grade peel-and-stick non-skid tapes and treads provide extra slip resistance for decks. MIL-PRF-24467C Type XI, Black & Gray.


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.


International Paint LLC

International Paint Engineered Coatings

Learn about our solutions for:
  • Structural Steel
  • Piping & Equipment
  • Storage Tanks
  • Pressure Vessels
  • Secondary Containment


    Sherwin-Williams
    Sherwin-Williams Protective & Marine Coatings

    With 4,000 distribution points and 3,700+ years of experience, Sherwin-Williams delivers the products, support and expertise you need, right where you need it.


    Polyval Coatings
    Polyflex® Polyurea Linings

    Polyflex ™ new Polyurea Geotextile Membrane System has been specifically engineered to protect the environment in containment applications.
    www.polyflexlinings.com


    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.

  •  
     
     
    Technology Publishing

    The Technology Publishing Network

    The Journal of Protective Coatings & Linings (JPCL) PaintSquare
    Durability + Design 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
     

    © Copyright 2000-2015, Technology Publishing / PaintSquare, All rights reserved
    2100 Wharton Street, Suite 310, Pittsburgh PA 15203-1951; Tel 1-412-431-8300; Fax 1-412-431-5428; E-mail webmaster@paintsquare.com