Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!
Today, the push to find more environmentally friendly solutions for paints and coatings has become very important. Paints contain volatile organic compounds (VOCs), that contribute to ground level ozone and smog and can be harmful to human health and air quality. VOC limits for formulated coatings have been instituted by local governments to meet the highest air quality standards. One such regional regulation set a limit of 100 g/L for industrial maintenance coatings in the South Coast Air Quality Management District (SCAQMD) of Southern California in 2007.
Waterborne coatings have been used to protect steel and concrete infrastructure for decades, and recent technical developments have led to materials with lower VOC content and higher performance. Onecomponent waterborne acrylics are often considered for light to medium duty service environments, but what level of performance can be expected from these systems? This paper will describe recent efforts to formulate waterborne acrylic coatings for steel protection below 25 g/L VOC and exemplify high performance over steel substrates. The very low VOC levels are facilitated by an innovative acrylic latex polymer that can be formulated at low coalescent levels and still demonstrate the highest standards of corrosion resistance and exterior durability. A comparison to a currently available low VOC resin and direct-to-metal (DTM) coatings will be described to highlight the advantages of the innovative binder and to demonstrate the high level of performance possible with waterborne acrylic coatings.
Erosion is one of the major threats of the pipeline integrity1 when it’s transporting liquid hydrocarbon products with solid particles. The erosion process decreases the effective wall thickness and therefore reduces the capacity of the pipeline to contain the pressured product. This can induce serious consequences including property, health and safety, environment, and business costs.
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Extensive and increased collocation of high voltage AC (HVAC) electrical transmission lines, coupled with advances in coating technology, has resulted in the emergence of the possibility of transfer of electrical energy from the HVAC line to paralleling utilities through electrical induction. That transfer of energy can result in safety risks for personnel, as well as corrosion risks for below grade assets. In order to mitigate those risks, operators ground the induced AC using grounding electrodes, typically consisting of bare copper cabling or zinc ribbon.
Rebars used in prestressed concrete structures are constantly subjected to tensile stress, and some rebars have been reported to fracture due to hydrogen embrittlement.1 It is important to know the hydrogen embrittlement behavior in rebars to prevent fractures. The effects of environmental conditions such as tensile stress, hydrogen content, and temperature on time to fracture have been evaluated individually;2,3 however, their combined effects have not been clarified. The purpose of this study is to experimentally clarify the relationship between time to fracture due to hydrogen embrittlement and environmental conditions to which the rebars are subjected.