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Nanoparticles are being considered in the development of durable coating systems due to their beneficial electrical and mechanical properties. The present study aims to investigate the corrosion performance of a nanoparticle enriched zinc rich primer (NPE-ZRP) for structural steel in aggressive marine exposure.
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Details of a new protocol for evaluating the effectiveness of coatings to reduce corrosion of steel structures is presented in this paper. Basic concepts of accelerated testing specified in American Society for Testing Materials (ASTM) standards and recent research investigations were used to develop a procedure that can provide conclusive results within 2400 hours of exposure as compared to more than 5000 hours in current practices.
Many common topcoat standards used for architectural and protective coating applications (e.g., MPI 311, SSPC-Paint 36) include a durability requirement based on the accelerated weathering performance of a white coating. However, there are currently no standards for field-applied coatings which address the needs of specifiers who want to ensure durable color performance in high chroma (saturated, or bright) colors, e.g., Safety Red.
Highly durable fluoropolymer coatings also generally have very good “stay-clean” properties. For this class of coatings, many of the factors contributing to stay-clean properties and exterior durability are linked. We will review these factors and examine particularly their role in affecting the properties of coatings based on the new waterborne fluoropolymer-acrylic hybrid technology. Using these principles, realistic estimates of the service life of these premium coatings can be determined.
The presentation will share new developments in polyaspartic technology that allows contractors to repair aged gelcoat originally used as the OEM /wearcoat over fiberglass composites and other architectural substrates by using this environmentally preferred option.
The market for protective linings in the oil and gas sector has evolved in the last 30 years, reflecting on both increased performance demands and productivity demands. This paper will review the successes seen with tank linings and the changes seen within the market (legislative, HSE and more aggressive conditions), later, via a case study it will elaborate how these have steered R&D in the development of the next generation of high-performance linings.Finally, the relevance of the American Petroleum Guidance (API652 and 653) to establish their continued relevance in lining selection and inspection intervals will be reviewed along with the utilization of linings to support changing demands (increased life expectancy and inspection intervals).
Zinc-Rich Primer (ZRP) based coating systems are widely used to protect steel infrastructure from aggressive exposure environments. These coating systems provide corrosion protection of the steel substrate by both barrier and sacrificial mechanism. Electrical continuity between the zinc pigments and steel substrate is the fundamental parameter in order to achieve galvanic protection and the use of high pigment volume concentration may not necessarily ensure effective electrical continuity. Moreover, high zinc content also degrades the bond of the coating matrix to the steel substrate. Carbon nanoparticles are being considered in the development of ZRP coating systems to overcome these limitations considering its physical, electrical and mechanical properties. In this effort, a nanoparticle enriched zinc-rich primer coating system (NPE-ZRP) was evaluated to identify the influence of nano-particles on moisture intrusion of the coating system. A traditional inorganic zinc-rich coating system (ZRP) was also evaluated to compare the overall performance of the NPE-ZRP coating system. Pre-exposure to the different levels of humidity (5%, 75% & 100% RH) was incorporated to identify the coating robustness and the influence of nano-particles to mitigate corrosion. Environmental pre-exposure to humidity didn’t appear to have a detrimental effect on the coating durability. Both coatings allow moisture intrusion inside the system and EIS can be used as an effective tool to estimate the moisture content.
Corrosion’s destructive effects on critical steel infrastructure have costly economic and securityimplications for the United States. According to a NACE International report from 2001, the annualcorrosion costs in the United States industrial sector were $47.9 billion per year, with the largest portionstemming from the maintenance of critical utilities such as gas, water, electric, and telecommunications. Catastrophic failure due to corrosion jeopardizes the resilience of critical utilities, risking the interruption of service to millions and creates weak-points the nation’s homeland security.
Thermally sprayed aluminium (TSA) has successfully been used for corrosion protection for several decades. In this investigation different repair coatings have been studied with respect to performance when applied on both TSA and bare steel.
The current process for coating large metal substrates, such as the decks of naval ships, requires pretreatment, primer, and topcoat steps. Developing a coating that can combine these steps into one would significantly reduce the labor costs and application time, which are significantly more expensive than the coating itself. This research shows the development of a self-stratifying alkyd coating.
Extending service life of an asset brings value to the owner and has the added benefit of reducing environmental impact. Arguably the biggest threat to service- life is degradation. When constructing with steel, corrosion is the threat to mitigate. Zinc dust incorporated into silicate resins have offered corrosion protection for heavy duty coating applications since the latter half of the last century. In recent years silicate finishes formulated without zinc have entered the market to create a two- coat system offering superior corrosion protection in a finish with various color options. The silicate finish or topcoat is low carbon and resilient to UV degradation allowing it to protect the zinc- rich primer from damage. For applications where a lower gloss finish is desired or appropriate, this technology offers decades long durability sustainably. This paper will explain what a two- coat silicate resin- based coating system is, how it works, what it looks like and most importantly how it reduces environmental impact through increasing service life of assets.Protective coatings, Corrosion control, Degradation, Durability, Coating lifecycle