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

 

Problem Solving Forum

| More

December 12 - December 18, 2011

What is the service life of a painted weathering steel bridge, compared to a painted carbon steel bridge in the same service environment?


Selected Answers

From ishita Bhattacharya of Berger Paints India Ltd on December 14, 2011:
     A painted weathering steel bridge will certainly perform better than a painted carbon steel bridge in the same service environment. Weathering steel can serve without a coating under normal humid environmental conditions but fails in a severe saline condition. It is then when the coating will serve as a protection against corrosion. Moreover, weathering steel needs to be exposed to an alternating wetting and drying cycle to develop the protective layer. But to conclude, a painted weathering steel will perform better than painted carbon steel bridge in any environment. As paint can fail in both conditions, weathering steel will have better performance compared to carbon steel.

From James Albertoni of CA Department of Water Resources on December 13, 2011:
     Ultimately, it depends on the environment. Theoretically, the painted weathering steel should have a longer service life because after the paint has failed, the weathering steel will corrode at a slower rate than plain steel. This, of course, is assuming that the weathering steel can be exposed to alternating wetting and drying cycles to form its protective corrosion product. Also, if you are too close to the ocean, weathering steel does not perform well. If you have the proper conditions for weathering steel, I don't see why you would want to paint it. It is a look that is attractive to some architects and capable of meeting most design lifes. As always, be aware that weathering steel produces rust-colored runoff that will stain everything it touches.

From Tom Schwerdt of Texas Department of Transportation on January 18, 2012:

     James, I think the requirement of a "wet/dry cycle" is bunk. We have 30+-year-old weathering steel girders here in Austin. The ones under the deck never get a wet cycle and still have most of the original millscale in place. Nowhere do they have pitting or section loss.

     Yes, you never form the "protective patina" - because it never experiences any significant corrosion. Concerns about exposures which are too salty and/or wet are valid. However, I expect a properly designed weathering steel structure in the correct environment (and I think 95+% of Texas qualifies)  should see over 100 years without any maintenance other than occasional washing/cleaning to remove debris.

Please sign in to submit your answer this question    

Tagged categories: Carbon Steel; Steel; Weathering


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

Industrial Vacuum Equipment Corp.
Hurricane Vacuums
& Dust Collectors

Vacuum and dust collector hose, filters and related accessories.
IndustrialVacuum.com


SAFE Systems, Inc.
Enduroguard -
The Tough Cable
for a Tough Industry.

Reduce maintenance costs and down time, increase job site safety with Enduroguard Cable. Available exclusively from SAFE Systems. UL listed, flexible, abrasion resistant and cut resistant.


Clemco Industries Corp.
Maximum Dust Suppression Systems Start at $14,950

The system comprises proven technology and equipment with user-friendly flexibility in mind. See it in action.


HoldTight Solutions Inc.
NO FLASH RUST - NO CONTAMINANTS

Our HoldTight®102 salt remover & flash rust
preventer prevents flash
rust by removing surface contaminants. Contact us
for your nearest distributor.
(800) 319.8802 sales@holdtight.com


Nationwide Overspray
Profession Overspray Removal Services

The Finest Name in Safe Overspray Removal. We specialize in removing all contaminants from any surface. Family Owned and Operated for 33 years! Fully insured. Satisfaction is guaranteed.


PSS Industrial Group
AirTech - World Leader in Custom Spray Solutions

AirTech is the solution
for any custom spray application. We have painting & finishing equipment, blast equipment, painting accessories, booth filter and many more items in inventory.


DeHumidification Technologies
HUMIDITY PROBLEMS?

DH Tech has the most innovative and reliable equipment available to
control humidity efficiently
and effectively.
IT'S UNDER CONTROL!


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.


Clemco International GmbH
Global engineering-trusted solutions

For more than 70 years, Clemco has provided the highest quality blast equipment with a total commitment to comfort and safety.

 
 
 

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