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Extended Connectivity of Zinc Pigments to Provide Enhanced Galvanic Coupling by Partial Replacement with Nanoparticles

Picture for Extended Connectivity of Zinc Pigments to Provide Enhanced Galvanic Coupling by Partial Replacement with Nanoparticles
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Coatings are widely used to mitigate corrosion of highway steel bridges in aggressive exposure environments. Zinc-rich-primer three-coat (ZRP) systems have been used since the 1980’s. However coating failure of ZRP has been identified within 15 years of application well short of typical 75 year bridge design service life. Most of the reported coating failure included corrosion undercutting blistering and delamination. Partial replacement of zinc pigments with nanoparticles in ZRP coating systems have been shown to provide beneficial physical chemical and mechanical properties. These enhanced qualities may provide enhanced performance to mitigate premature coating failure. Earlier research showed that the nanoparticle enriched primer provided comparable corrosion resistance in aggressive environments as conventional three-coat systems. Nonetheless coating performance can be compromised by inappropriate surface preparation before coating application. Exposure to high humidity and surface contaminants (hygroscopic salt) as well as noncompliance to proper anchor profile requirements can initiate coating failure. The purpose of this study was to evaluate the effect of surface preparation with varying surface contaminants on the corrosion performance of a nanoparticle enriched zinc rich epoxy coating (NPE-ZRP) system. Adverse environmental condition exposure to different level of humidity (5% 75% and 100% RH) water immersion and salt contamination were incorporated before the coating application. After adverse exposure NPE-ZRP coating and a traditional ZRP coating (as a reference) were applied over the coupons. Cyclic testing in alternate wet/dry exposure was done for ~5 months. Coating and corrosion behavior was analyzed during the wet exposure of the cyclic testing by Open Circuit Potential (OPC) Linear Polarization Resistance (LPR) and electrochemical impedance spectroscopy (EIS). Physical parameters such as changes in coating thickness pull-off strength and cross-sectional micro-graphic analysis were also assessed to elucidate the extent of coating degradation.

Product Number: 51319-13470-SG
Author: Saiada Fuadi Fancy
Publication Date: 2019
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$20.00
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Optimization of Accelerated Life Testing of Anodes

Product Number: MPWT19-15290
Author: Mansour Alhammad, Abdullatif Alabdulhadi, Balasubramani Bakthavatchalu, Nayef Alanazi, Haitham Aljuhani, Abdulrahman Alhuwaiji
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The performance of titanium mixed metal oxide (MMO-Ti) anodes — provided by five global vendors — targeted for coke breeze backfilled soil impressed current cathodic protection (ICCP) applications, was investigated in this study. The time to failure of the MMO anodes was measured in accordance with NACE TM0-108. Accelerated lifetime testing was performed on MMO anodes to measure sample durability and to adequately meet the current density design requirement (0.06A/cm2). The anodes were immersed in 1M sulfuric acid under varying current densities (1A/cm2, 1.4A/cm2 and 2A/cm2) under controlled temperature, until the samples lost their electro-catalytic properties. The results measured at 1A/cm2 illustrated that time to failure of the tested anodes ranged from 10 days to more than 90 days. While conducting the same test at 1.4A/cm2, time to failure of MMO anodes was reduced to a range of 13 days to a little over 30 days yielding results of anode ranking consistent with those measured at 1A/cm2. Therefore, for the sake of time, the optimum applied accelerated current density was recommended to be 1.4 A/cm2 for Ru/Ta MMO anodes, to push them to their limits at a faster rate in a shorter time.
Advances in Fluoropolymer Resins for Long-Life Coatings
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Advances in Fluoropolymer Resins for Long-Life Coatings

Product Number: 41206-230-SG
Author: Winn Darden
Publication Date: 2006
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Fluoroethylene-vinyl ether (FEVE) resins were developed in the early 1980’s. These thermoset solution fluoropolymer resins are used to make highly durable, weatherable, and corrosion resistant air-dry coatings. Applications are found in architectural, industrial, automotive, and aerospace markets, and in infrastructure coatings for bridges, oil rigs, and water towers. 
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Product Number: 41210-528-SG
Author: David Brysacz
Publication Date: 2010
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The intent of this presentation is to outline a procedure that if followed Polymer Linings will protect the customer’s assets for many years. The perception is that Polymer Linings only last for 6-8 years then they have to be totally removed. This presentation will show if proper procedures are followed Polymer Linings that have been in service for many tears do not necessarily have to be totally removed.
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