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An effort was executed, to leverage the inherent benefits of polysiloxane coatings, to investigate, to assess or develop, and to implement an effective corrosion stain remover in the Navy with the focus of reducing both maintenance costs and time.
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This standard provides guidelines for establishing minimum requirements for the protective coatings of ships exterior topsides and related structures exposed to the marine atmosphere. It covers coating materials, coating test protocol and acceptance criteria, surface preparation, coating application, quality assurance and control, and repair method.
The US Marine Corps (USMC) uses the various paints within the specifications that makeup the CARC system on their vehicles and weapon systems. Their use includes new system acquisition, field repair, major repaint activities and during complete system rebuild at the depots.
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.
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.
Current and impending environmental regulations are leading to the development and use of new technologies in a variety of marine and protective coatings applications. Among the various challenges presented to the coatings industry, the desire to decrease the level of volatile organic compounds (VOCs) in traditional solventborne coatings ranks among the most prevalent.