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Mechanism of high temperature anticorrosive coating

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The high temperature resistant anti-corrosion coating is based on the rapid reaction of the OH active group in the coating base material with the active component in the filler and the polar group on the active surface of steel to generate a three-dimensional cross-linked polymer, which gives the material and the coating good mechanical properties, thus bringing good bonding force with the substrate. The coating is closely connected with the steel matrix to form a high-temperature anticorrosive coating with electrochemical protection and physical shielding. At the same time, because the coating is baked at a high temperature above 400 ° C, the coating will gradually discharge water (dissolved water, crystal water, structural water, water generated by the curing reaction), after high temperature curing, some special material coatings will form a dense ceramic layer at about 800 ° C, and the international and domestic high temperature anti-corrosion technology is roughly divided into organic series and inorganic series. Organic high temperature anti-corrosion coatings usually use organic siloxane as the carrier, the maximum modified temperature will not exceed 400 degrees Celsius, more than this temperature will occur carbonization or softening, temperature resistance is not enough, easy to make the coating skin, wrinkle, discoloration and other defects. The inorganic high temperature anticorrosive coating can withstand the high temperature environment of at least 600 ° C, and will not cause the coating to produce peeling, creaking, discoloration and other defects, so as to achieve better high temperature and corrosion protection effect, with good thermal stability, chemical resistance and mechanical properties, inorganic polymers are usually hard and brittle.
However, this is obviously far from enough, for example, chemical raw material production furnace, the temperature in the furnace can reach 1000 ° C, there is no complete high temperature anti-corrosion protection, which will cause the furnace material to corrode rapidly in a high temperature environment. If the metal is not protected by high temperature anti-corrosion coating, the speed of oxidation corrosion will be accelerated in high temperature environment. For an enterprise producing sulfur dioxide, there are many corrosive gases. If there is no high temperature anti-corrosion coating to protect the metal of the furnace body of the baking furnace, the metal plate of the 4cm thick furnace body will be completely corroded after more than three months. At present, the common high-temperature anti-corrosion coatings epoxy phenolic paint, inorganic zinc-rich paint, organic modified silicone paint and other long-term working temperature, all do not exceed 400℃. At present, the high-temperature corrosion coatings that are resistant to 600℃-1200℃, in addition to the national scientific research achievements in aerospace and other military fields, are mostly composed of a variety of materials, and the use time is short and the performance is not stable. Therefore, to find or research and develop a matrix with strong adhesion, high temperature resistance, oxidation resistance, corrosion resistance, wear resistance, weather resistance, rust prevention, flame retardant, heat insulation and other performance characteristics, "set" high temperature anticorrosion performance, both organic and inorganic polymer characteristics of high temperature anticorrosion material, has become a hot spot in the field of chemical high temperature anticorrosion experts research.

Room termperature curing polysilazane, pls check IOTA 9150, IOTA 9150A
High termperature curing polysilazane, pls check IOTA 9108, IOTA 9118.     

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