![]() ![]() Inorganic zinc primers perform best when applied to a near-white blast-cleaned surface under SSPC-SP 10/NACE 2 regulations. It’s important to recognize that although inorganic zinc is very effective under the right circumstances, it is not ideal for all applications. When environmental hazards are relatively mild, galvanizing steel surfaces is generally held to provide the best long-term protection for the substrate. Should You Choose Galvanizing or Inorganic Zinc Primer? Inorganic zinc performance can be improved with a sealer coat. As the resin hardens, it provides better abrasion protection and has the potential to resist chemical corrosion. The zinc particles in a primer application are discontinuous and connected by a resin. The higher the concentration of zinc, the better the overall performance for the primer. This enables a higher concentration of zinc. The silicate binder in an inorganic primer formulation ensures that the binder reacts to the zinc particles rather than encapsulating them. Inorganic zinc primers are generally preferred over their organic counterparts because of their superior corrosion resistance. This substantially slows down the corrosion rate of the underlying steel at the expense of the coating. Organic and inorganic zinc primers are available and each can provide some level of sacrificial protection. The basic principles of how zinc primer protects steel are very similar to those behind galvanization. Sacrificial protection is prioritized over barrier protection. ![]() ![]() Whatever the case may be, the zinc corrodes much more slowly than the steel it defends. Galvanized steel is typically used in situations where the component needs to be highly resistant to salt, air pollution, acid rain, and other environmental factors. The electroconductivity of zinc protects the steel even as the zinc itself corrodes. Galvanized steel does eventually become susceptible to oxidization, but it takes an extremely long time. The layer of zinc is highly reactive in the presence of oxygen and serves as a sacrificial coating that protects underlying metal. This creates an interlocked, non-corrosive, inert matrix that generates galvanic protection. In the modern galvanizing process, the steel is coated with a continuous layer of zinc forming a thin layer of alloy beneath a smooth layer of metallic zinc. ![]() Galvanized steel is made by dipping steel components into molten zinc. Here, one debate stands out above all others: Should you use inorganic zinc primer or galvanize? What is Galvanizing? The primer-topcoat approach is one of the mainstays of industrial corrosion prevention.Ĭorrosion protection is a key concern for virtually everyone in the industrial environment. They improve adhesion to the surface and unlock some of the topcoat’s performance qualities, depending on the formulation. Primers are essential for a variety of reasons. Direct to metal coatings are becoming more popular and versatile, especially in the marine sector, but in most cases you will need to plan your project around priming your surfaces correctly. Most of today’s coating products take the form of a two-coat solution with a primer and topcoat. ![]()
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