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What's the components of zinc-rich coating?


Among inorganic zinc-rich coating, tetraethyl orthosilicate and cement slurry categories have small market share due to their disadvantages of toxicity and poor performance. The widest applied product in the current market is sodium silicate inorganic zinc-rich coating. It develops from the primary formula integrating sodium silicate (immersed in thermonatrite) with zinc powder, potassium silicate to the current lithium silicate produced by new process. Its components and process have been much more complicated and superior.
Besideszinc powderfiller, the pigmenttype andcompositionare alsocolorful, the film-forming base materials are morecomplexand the products are divided intoalter-fixingtype andself-solid type owing to the increasing number of additives(curing agent). In the initial stage of film-forming of the sodium silicate inorganic zinc-rich coating, it is soluble in water. But after solidification, it has excellent water resistance and can immerse in water for a long time. In addition, due to no organic solvent, it is odorless, non-flammable and non-explosive. It has simple operation process and low comprehensive cost and its operation tools are easy to clean. It does not pollute the environment and has anti-corrosion effect for a long time. Meanwhile, because some varieties have low porosity, it can be used for thermal spray zinc surface sealant which can replace the traditional thermal spray zinc (aluminum).
Furthermore, it has excellent electrical conductivity that can weld and cut with coating so it is superior to organic epoxy zinc-rich coating and is a new generation of potential eco-friendly coating. Compared with traditional thermal spray zinc with mature process, it has relatively outstanding advantages.First, as the thermal spray zinc has a single layer of zinc sacrificial anode protection, its corrosion rate depends only on the zinc layer thickness and dissolution rate. While for the inorganic zinc-rich, besides zinc layer protection, the lithium silicate, zinc silicate and basic carbonate, etc. produced from complex chemical changes can better cover the metal surface. Second, because the porosity of the thermal spray zinc is relatively high (generally between 3% and 5%), it needs further coating of inclusion reagent. But the sodium silicate inorganic zinc-rich coating film has relatively low porosity (generally below 1%) so it can act as the surface inclusion reagent for thermal spray zinc. Third, with complex process, the thermal spray zinc requires high-temperature and high-pressure facility while the inorganic zinc-rich is flexible to operate in spray coating and brush coating. Generally, the inorganic zinc-rich has lower comprehensive costs.

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