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Zinc-rich primers, with zinc dust loadings of 80-85% by weight in the dry film, are often the preferred primer during new construction of assets placed in environments with high atmospheric corrosivity. Coating standards such as SSPC-Paint 20 and ISO 12944 demand that zinc-rich primers contain at least 65% and 80% zinc dust by weight in the final dry film, respectively. Traditional zinc rich primers need this high zinc loading to achieve galvanic protection of steel. New technology allows us to develop zinc primers with a lower content of zinc and/or different zinc morphology than dust to provide similar or better corrosion protection to the steel.
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The tendency of pipeline girth weld coatings to shield cathodic protection (CP) current was studied in the laboratory. Epoxy, epoxypolyurethane, polyurethane, and wax were investigated. Results showed that the liquid coatings, when applied extra thin to accelerate the kinetics of absorption and current transmission, all disbonded by blistering, and all allowed CP current to be transmitted.
Users are now beginning to specify low amounts (typically <30ppm) of free chloride in the coatings to be applied to stainless steel.This paper details the development of a method that clearly identifies a reproducible level of leachable chloride present in coatings.
A flamesprayed thermoplastic coating was applied in 2000 to the sheet piles of the Delta Pier, located at Naval Submarine Base at Bangor, Washington. That coating system quickly failed. This paper discusses several rehabilitation strategies, the construction restraints, and how these divergent factors were resolved.
During the testing of circular grit chambers in a wastewater treatment plant under construction, serious leaking problems were discovered prior to project completion. After meetings with the Owner, Design and Construction engineering firms, painting contractor and coatings manufacturer, the decision was made to apply 80 mils of pure polyurea to various concrete surfaces. This presentation, through the use of photo images taken during remediation, describes the nature of the problem and how it was solved.
The case study demonstrates different approaches towards what went wrong and why on pressure safety valve susceptible to MIC growth. The Eocene Sub Centre-1 Shipping Pump discharge header connected pressure safety valve (01PSV172) reported leaking from the body and POD requested Asset Integrity Division to conduct Root Cause Analysis with recommendation.
This study will provide an overview of silicon-based chemical vapor deposition (CVD) nanocoatings that, when applied to stainless steel and other alloys, fight corrosion while simultaneously easing design, fabrication, and integration of coated components.
Chemically Bonded Phosphate Ceramic coating was investigated in various environments such as inland, beach and salt-fog exposure. After 8-month outdoor testing, the coating was evaluated by visual inspection, coating thickness, adhesion measurement and X-ray diffraction. Long term testing ensued, up to 24 months.
Fitness for purpose of low temperature cure liquid-applied coating systems for pipeline maintenance and repair. Potential revisions to incorporate low temperature cure liquid-applied coating products into Table 1 of CSA Z245.30-14 will be presented along with commentary related to the deviations from the standard.
A method to test new surface preparation techniques for preparing existing offshore structures for maintenance painting has been developed. This paper will explain how the tests were conducted, how effective each method was at removing salts, and how the coatings performed in the ISO and NASA tests.
An artificial geothermal water was used to investigate the performance of high alloyed materials. The electrolyte has pH 4 and contains 1,500 mg/l Cl-, 20 mg/l SO42-, 15 mg/l HCO3-, 200 mg/l Ca2+, 250 mg/l K+, and 600 mg/l Na+.
The American Association of State Highway and Transportation Officials adopted this new specification to establish and define the functions, operations, requirements, and activities for Thermal Spray Coatings applications on steel bridges.