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Most of atmospheric coatings and tank linings for offshore maintenance are routinely applied on rusted steel after dry abrasive blasting. It is well known that the salt contamination on rusted steels cannot be completely removed by dry abrasive blasting alone. Residual salt contamination, which is hidden in the corrosion pits, is difficult to remove mechanically. Depending on the rust severity, the residual salt content on the dry abrasive blasted steel surface can be in the range of 5-65 μg/cm2. Too much residual salt contamination can be detrimental to coating performance. It could cause coating blistering, adhesion degradation, and under film corrosion which will result in a shorter service life, particularly in immersion service such as pipeline coatings or tank linings. Recently wet abrasive blasting (WAB) has been used as the surface preparation in conjunction with the decontamination chemicals.
Most of atmospheric coatings and tank linings for offshore fabric maintenance are routinely applied on rusted steel after dry abrasive blasting. It is well known that the salt contamination on rusted steels cannot be completely removed by dry abrasive blasting alone. Depending on the rust severity, the residual salt content on the dry abrasive blasted steel surface can be typically between 5 - 65 μg/cm2. Recently wet abrasive blasting (WAB) has been used as the surface preparation in conjunction with the decontamination chemicals. The effectiveness of residual salts removal and prevention of flash rust with the surface preparation method combining the WAB and the decontamination chemicals was verified in our previous AMPP 2021 paper. The improved flash rust resistance combined with the possible changes of surface properties of the wet abrasively blasted steel surface may affect its compatibility with the applied coating systems, which is of great concern.
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.
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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.
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.