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Silicone alkyds have been utilized by the Navy for over 50 years and remain the only single-component technology that is qualified under MIL-PRF-24635. Although the predominant coating in the Fleet, silicone alkyd coatings continue to provide poor color and gloss retention, poor chemical resistance, low hardness, slow cure times and limited cleanability to running rust.
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Silicone alkyds are single-component (1K) systems and do not require the mixing of components before application. These systems are easy for sailors to apply (via brush or roll), have an indefinite pot-life in a closed can, and will cure under harsh marine conditions, which are why these coatings have been utilized on the exterior topsides of Navy surface ships since the early 1960s. However, these “user friendly” coatings provide limited color and gloss retention, limited resistance to shipboard hydrocarbons, and limited resistance to staining from running rust and soot.
Over the last few decades, people in the field of management have been involved in a search for the “best” style of leadership. Yet, the evidence from research clearly indicated that there is no single app-purpose leadership style. Successful leaders are those who can adapt their behavior to meet the demands of their unique situation.
Appendix A of the AISC Specification for Structural Joints Using High Strength Bolts published by the Research Council on Structural Connections describes the testing methods to determine the slip coefficient of coatings used in bolted connections.
Quality Assurance (QA) paint testing is an important obligation of any paint manufacturer and/or end user. Each year, hundreds of batches slotted to be applied on US Army Corps of Engineers (USACE) hydraulic steel structures around the country are submitted to be tested at the Engineering Research Development Center, Construction Engineering Research Laboratory, Paint Technology Center (ERDC-CERL-PTC). A significant fraction of those samples fail.
Stress Oriented Hydrogen Induced Cracking (SOHIC) susceptibility of SA516 Grade 70 carbon-manganese steel was studied according to NACE MR0175/ISO15156-2 standard by four-point-bending and constant load test methods. Base metal and welded specimens were investigated.
In this paper focus will be placed on the non-oxidative and non-regenerative H2S scavenger MEA Triazine and its application in contact tower systems, specifically looking at solids (polymeric dithiazine) formation.
Recycling flexible packaging multi-materials such as blister packs and food packaging laminates is critical if we are to reduce the severe environmental effect of plastic waste. The purpose of the experimental work was to develop a series of non-toxic, stable, deep eutectic solvents (DES) and ionic liquids (ILs) for the separation and the recovery of polymer-aluminium laminates. Studies identified a number of DESs and ILs that could be used to successfully delaminate three common aluminium containing packaging laminates thereby enabling complete separation and recovery of the constituent plastic and aluminium layers. Analyses of the corrosion and/or dissolution behaviour of aluminium in the DESs and ILs found such effects to be limited towards the recyclability/uprecyclability of the aluminium.
The determination of the concentration of soluble salts on a surface prior to the application of paint is a key inspection task for most protective coating processes. The entrapment of soluble salts, particularly on a steel surface can lead to premature coating adhesion failure and corrosion cells being established.
Cleanliness of a metal surface prior to coating is imperative, just ask the paint manufacturers. Whilst there are several measurement techniques available to determine the level of soluble salts on a substrate prior to coating, Bresle is still considered by many as the “gold standard”.