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Corrosion

corrosion bridge component steel frame failure

Bridge Expansion Joint Designs: Corrosion of Steel Framing Below Deck and Pier Cap Reinforcement

My wife thinks that my driving skills are poor.  She is not entirely wrong in this opinion.  Whenever I am on a long drive or I am driving in an unfamiliar area, my eyes tend to stray from the road and examine any bridge or sign structures I come upon.  If you do the same …

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corrosion protection

Corrosion Protection of a Halifax Harbour Bridge: Challenges, Issues and Opportunities

The Angus L. Macdonald Bridge is a 1.3-kilometer-long (4,265-foot-long) cable suspension bridge that carries automotive traffic over the Halifax Harbour between Dartmouth and Halifax. There are four approach spans to the west cable bent on the Halifax end and 12 approach spans to the east cable bent on the Dartmouth end. The bridge was opened …

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Weathering Steel – Use and Preparation When Left Uncoated and When Coated

Weathering steel, often referred to by the genericized trademark COR-TEN steel, is a group of steel alloys developed to form a stable corrosion-resistant surface after several years exposure to weather, potentially eliminating the need for painting in many environments. U.S. Steel (USS) holds the registered trademark on the name COR-TEN, which refers to the two …

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accelerated weathering corrosion

How Long Should You Run an Accelerated Weathering/Corrosion Test?

“I would like to issue a 30-year warranty on my product.  How long of a test should I run to correlate hours to years?” or, “Our engineering standard requires 2000 hours of exposure.  Is that long enough?” and what is the correlation in years?”  These are important questions, and are challenging to answer. This article …

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surface soluble salts

Surface Soluble Salt Measurement – Conductivity Verses Ion-specific Methods of Analysis

Chemical contaminants on a surface can include chlorides, ferrous ions, sulfates and nitrates, among other types of soluble salts. Chloride may come from deicing materials or marine/coastal environments, ferrous ions are a by-product of corrosion, sulfates can be airborne, particularly in industrial environments (e.g., coal-fired power plants) and nitrates may come from the soil (e.g., …

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elevated lattice structure

Corrosion Management of Elevated Lattice Galvanized Structures

      Many countries, especially the western nations who had ramped up and developed immense industrial capacities during World War II, underwent huge expansions in their infrastructure after the end of the war, primarily in the 1950s, 1960s and into the 1970s. Not only did this include the building of roads, bridges, ports and …

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Pitting Due to Stray Current Corrosion

Section loss of pipe wall is of great concern in the pipeline industry. Reduced wall thickness due to pitting corrosion can adversely impact pipeline integrity; the results of which can be catastrophic depending on the product that the pipeline is transporting. In order to reduce the opportunity for corrosion, the use of protective coatings is …

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