Materials Performance

MAY 2015

Materials Performance is the world's most widely circulated magazine dedicated to corrosion prevention and control. MP provides information about the latest corrosion control technologies and practical applications for every industry and environment.

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8 MAY 2015 MATERIALS PERFORMANCE NACE INTERNATIONAL: VOL. 54, NO. 5 Continued f rom page 6 UP FRONT —Kathy Riggs Larsen junction with the close of a four-year in- vestigation into corrosion-related brake failures in General Motors (GM) trucks and SUVs built in model years 1999 to 2003, as well as similar trucks and SUVs made by other manufacturers. The data indicate that the brake line corrosion seen in the GM vehicles was not unique— similar vehicles using comparable brake pipes experienced similar corrosion issues, especially in states using salt to deice roads in winter—and this corrosion prob- lem is linked to the coating materials used on steel brake pipes by several manufac- turers during this time period. Beginning in the late 1990s, manufacturers transi- tioned to plastic-coated pipes that are in use today. For more information, visit nhtsa.gov. NPS Releases Report on Gateway Arch Corrosion NPS photo. Over the past two decades, personnel with the U.S. Department of the Interior's Na- tional Park Service (NPS) noticed discolor- ation and streaking on the 0.25-in (6.3- mm) thick stainless steel (SS) exterior of the iconic Gateway Arch, part of the Jeffer- son National Expansion Memorial in St. Louis, Missouri. As a result, a comprehen- sive corrosion study of the monument was undertaken in October 2014 by a project team from Wiss Janney Elstner Associates, an interdisciplinary firm of architects, structural engineers, and materials scien- tists, to determine the structural health of the 900 tons (816,480 kg) of SS that com- prise the Arch's outer skin. In a report re- leased by the NPS, the team notes a variety of blemishes, deposits, and discolorations are a result of original construction and do not indicate significant corrosion, dis- tress, or deterioration. Also, they say red- orange staining seen on the lowest two panels of the Arch appear to be the result of corrosion of embedded iron particles from implements used to scratch graffiti into the surface of the steel. No distress or corrosion was observed on the welds. Cleaning trials reduced some of the super- ficial corrosion staining and provided a wide range of passivation and refinishing options for the SS. The complete report is available at nps.gov/jeff.

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