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Modern high performance paint systems are so durable that when exposed to natural weathering they may show only slight signs of deterioration. This means that new coatings being marketed have limited track records. Which creates an increased reliance on accelerated laboratory testing to evaluate performance.
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Inorganic zinc-rich coatings (IOZ’s) are often considered the gold standard for corrosion protection in atmospheric environments. Frequently, zinc epoxy coatings are considered second best among the most effective coatings for corrosion protection. However, current zinc-rich coating technology is not exempt of limitations, such as poor mechanical properties of the film, rigid environmental application conditions, or the inefficient use of zinc particles for providing galvanic protection. Due to these limitations, a number of asset owners have made the decision not to use zinc-rich coatings to maintain coating systems in marine and offshore environments
The nature and rate of corrosion of a metal depend upon –among other factors- the corrosivity of the environment to which it is exposed. The corrosivity category is a technical characteristic that provides a basis for the selection of materials and protective measures in different environments subject to the demands of the specific application, particularly concerning service life. Data on the corrosivity of the atmosphere is essential for the development and specification of optimized corrosion protection for manufactured products.
Protecting mechanisms of a new generation of activated zinc primers with enhanced protection vs inorganic zinc rich primers. Performance properties have been proven with results from different corrosion tests.
Zinc rich primer coatings, both organic and inorganic, are extensively used in highly corrosive environments and they are part of a high performance coating system in the Protective Coatings Industry. During the 60’s and the 70’s, zinc rich epoxy primers dominated the market. Later, zinc ethyl silicate primers took over mainly due to their higher potential to corrosion protection. Nowadays however, new developments in zinc epoxy primers are setting the two categories of Zinc rich primers on the same level in terms of anticorrosion performance while adding the advantages of Epoxy based primers.
The US Army Corps of Engineers, Paint Technology Center (PTC) is a Technical Center of Expertise forall things paints and coating for the Corps and Army. The PTC has a mission, among other things, toexecute research and development directly related to the corrosion mitigation properties of commercialand experimental coatings. As part of this effort, coated panels are subjected to accelerated weatheringconditions and rust creep is quantified to determine the level of recommended mitigation.