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The corrosion processes in biogas power plants investigated. Influence of feeding materials. Long term exposition tests of two stainless steels and galvanized steel. Scanning electron microscopy and metallographic cross sections. Electrochemical measurements. Results. Safety.
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Marine coating systems installed aboard commercial and military vessels are exposed to extremely aggressive environmental conditions during maritime operation. A key element in prolonging the useful life of any ship, both commercial and military, lies in the selection and installation of cost-effective corrosion control methods and materials at newbuild.
Lowering the volatile organic content (VOC) of industrial coatings has become a requirement in many reformulation and new coating development efforts, oftentimes in order to meet increasingly strict regulations. Driving VOC to lower levels and performance to higher levels can also offer a more sustainable coatings solution for the end-user. Lowering VOC and maintaining (or improving upon) high performance is often the goal when developing a new formulation, but the two objectives can be at odds with each other.
Understanding the key components that cause osmotic blisters is essential to not only applying the proper concrete floor coating, but potentially walking away from a possible high-risk floor. Resinous floor coatings are organic coatings that have limitations. Coating failures are typically linked to moisture in the concrete slab. This can be a problem for resinous floor coatings that aren't moisture tolerant.
Protective coatings are used in anaerobic digesters to achieve both corrosion protection and gas tightness. With respect to the need for corrosion protection, anaerobic digesters, under typical operating conditions, do not create exposures which are corrosive to either carbon steel or concrete substrates. This paper will explain the basics of how anaerobic digesters work chemically to stabilize biosolids and demonstrate the atypical operating conditions under which corrosion becomes problematic.
Inorganic zinc (IOZ) silicate coating was previously applied to partially fabricated low alloy, 21/4 Cr-1MoV, high temperature, hydrogen, reactor vessels for long-term storage corrosion protection prior to final welding and post weld heat treatment (PWHT) at 690-720°C (1274-1328°F). The need for complete coating removal to mitigate the known embrittlement and weld cracking that can occur after welding and PWHT led to the development of a novel, environmentally friendly method to remove IOZ to trace levels below 1 ppm.
Over the past several years, the Bureau of Reclamation’s Materials Engineering Research Laboratory has been developing and refining a test method to evaluate a coating’s resistance to erosion damage in sediment-laden immersion exposure. This test has initially been utilized as a screening/ranking method in selection of new coatings for the aforementioned severe service environments.
This research paper describes the various predicaments and issues to enhance the effectiveness of environmentally responsible food grade paint, which helps in maximizing safety and reducing the risk of corrosion. The presentation of this report will consider the characteristics of food grade paint as well as enumerates the companies that produce food grade paint.
This paper is a case study on a 100% solids epoxy penetrating sealer being used as a tie coat between a tightly adhered latex acrylic and aliphatic polyurethane.