Celebrate World Corrosion Awareness Day with 20% off eCourses and eBooks with code WCAD2024 at checkout!
Currently, Ships’ Force (SF) conduct maintenance and repair painting during pier-side periods as well as while ships are underway. SF commonly use epoxy primers, such as MIL-DTL-24441, Type IV, for maintenance painting and in some cases, chloride contamination and surface profile is not adequately controlled. The Naval Research Laboratory (NRL) conducted a study to verify the efficacy of replacing the current epoxy primers commonly used by SF with more “user friendly” high-build, high-solid primers.
Currently, Ships’ Force (SF) conduct maintenance and repair painting during pier-side periods as well as while ships are underway. SF commonly use epoxy primers, such as MIL-DTL-24441, Type IV, for maintenance painting and in some cases, chloride contamination and surface profile is not adequately controlled. The Naval Research Laboratory (NRL) conducted a study to verify the efficacy of replacing the current epoxy primers commonly used by SF with more “user friendly” high-build, high-solid primers. The study examines key characteristics of high-solid primers for SF applications, such as surface tolerance, adhesion to varying surface preparation, pot life, edge retention, “workability,” and compatibility with common silicone alkyd and polysiloxane topcoats. High-solid, edge-retentive coatings are capable of being applied in a thicker, single coat (6-8 mils) saving time by not having to apply multiple coats of primer. The analysis of “workability” and “user friendliness” of the coating system includes testing of high-solids coatings in innovative, new coating packaging methods including burst pouches, aerosols, and smaller convention packages. NAVSEA will use the results of this study to develop improved SF maintenance and repair coating processes.
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.
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Mineral abrasives such as glass bead and aluminum oxide have been traditionally used in the surface finishing industry. The general perception is that they offer acceptable cleaning at a low operating cost. Often dismissed is the potential of metallic alternatives that though seemingly higher in initial procurement cost, offer several differentiating advantages in terms of recyclability, consistency of finish, repeatable results and ultimately resulting in overall, reduced operating costs.
The creepage of corrosion underneath a coatings film applied to a steel test panel is often used as a performance test for the anti-corrosion properties of a coating system. Underfilm corrosion creep, also sometimes referred as scribe creep in the laboratory environment, is defined as the degree of corrosion emanating away from a scribe line underneath a coating film applied to a steel substrate.