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

Desco Mfg. Co., Inc.
DUST-FREE SOLUTIONS For Lead Abatement

Tools operate at levels well below OSHA limits for hazardous material removal; meet SP11 specifications when required and low vibration tools increase productivity.


Safway Services
Superior Suspended Access with QuikDeck®

Get improved platform stability with QuikDeck®. Open workspace designed for fast installation and safety. Easily moved to reduce cost. Safe to the environment.


Specialty Products, Inc. (SPI)
Polyurea & Polyurethane Spray Foam Training

SPI is committed to industry leading technical training for polyurea & polyurethane spray foam professionals. Attendees receive hands-on, in-depth training for using and troubleshooting plural-component equipment, spray guns, machine hoses & parts.


Industrial Vacuum Equipment Corp.
Hurricane Vacuums
& Dust Collectors

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


Easy-Kleen Pressure Systems Ltd.
HIGH PRESSURE HOT WATER/STEAM UNITS

3000 to 8000 PSI ALL IN ONE: Water tank, reels and unit enclosed in an industrial skid frame. Call Today and ask about the Fill & Play Series 1-800-315-5533


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”


Novatek Corporation
Novatek Corporation, Dustless Coatings Removal

Strip, clean and profile all dust free! Comply with new lead standards. Contact today: (866) 563-7800


DeHumidification Technologies
HUMIDITY PROBLEMS?

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


Fischer Technology Inc.
Measure TSA Coatings on Stainless Steel

The PHASCOPE® PMP10 from FISCHER precisely measures thermally sprayed aluminum (TSA) on stainless steel.


Seymour Midwest
Coating Application Tools & Supplies

Visit our “Where to Buy” site to find a local paint or tool supplier near you. Click here for a chance to win $500 of Tools & Supplies. 1(844)739-6687 Sales@SeymourMidwest.com

 
 
 
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 2000-2016, 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