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    Home > Coatings News > Paints and Coatings Market > Introduction to the use of combustion exhaust gas corrosion and high temperature anti-corrosion paint

    Introduction to the use of combustion exhaust gas corrosion and high temperature anti-corrosion paint

    • Last Update: 2021-01-11
    • Source: Internet
    • Author: User
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    China Coatings Online News Information
    The law of corrosion oxidation of materials at high combustion temperatures is due to the heat-generated oxidizing substances of materials, and the rate of corrosion oxidation of materials is related to heat and corrosive media. Burning high temperature corrosion In order to maintain the corrosion reaction, there must be two kinds of migration O
    2-
    and M
    2 plus
    through the migration of oxidizing film, the existence of the migration form through the lattice diffusion, T higher, through the crystal boundary diffusion, T lower, while through the lattice, crystal boundary diffusion, such as Ti, Zr and so on in the medium temperature zone (400 to 600 degrees C) long-term oxidation. High temperature anti-corrosion paint is very good protection materials at high temperatures from corrosion. The rate of metal oxidation reaction at high temperature is usually expressed as the growth thickness (dy/dt) of the oxidizing film per unit of time, and the dynamic curve of metal oxidation at high temperature follows five laws: straight line, parabolic, cubic, pair and opposition. When metal oxidation is not caused at high temperatures, if an oxidation film cannot be produced, or if gas or liquid phase products are formed during the reaction and disengaged from the metal surface, the oxidation rate remains constant (k), determined by the chemical reaction that forms the oxide.
    coal is burned at high temperatures, i.e. high temperature heat is generated and oxygen corrosion and sulfur corrosion coexist at high temperatures. If the combustion of flue gas is acidic, if the temperature of the flue gas is lower than the acid dew point, the condensed acid will erode the internal wall of desulfurization, the installation of wet flue gas desulfurization (FGD) assembly can not actually remove so
    3
    in the flue gas, but will corrode the equipment at high temperatures. In modern industrial production equipment, hot flame, hot metal, high temperature and high pressure, high temperature material oxidation corrosion, these conditions are high temperature resistance, pressure, corrosion is serious, the material continues to withstand a variety of combined forces, if there is a problem, industrial production will appear serious safety accidents, the consequences are very serious. High-temperature anti-corrosion coatings meet the corrosion-resistant requirements of high-temperature equipment, do not occur industrial safety accidents, to ensure the normal operation of high-temperature equipment materials.
    high temperature environment corrosion mode is mainly high temperature oxidation corrosion, taking into account other high temperature corrosion. Many years of high temperature anti-corrosion paint research and development process found that high temperature oxidation corrosion is the most common form of high temperature corrosion, at high temperature almost all metals (except Pt, Au, etc.) in the atmospheric environment have a tendency to spontaneously oxidize, oxidation loss accounted for 7 to 10% of steel production. The basic process of metal oxidation and corrosion at high temperature is divided into two ways, one is the physical adsorption stage: O
    2
    diffusion to the O
    2
    /MO interface, the occurrence of physical adsorption, its adsorption heat <25J/mol; Stage: O
    2
    decomposes into atomic oxygen, chemical adsorption becomes O
    -
    , and eventually O
    2-
    is formed in the MO/M interface, and metal M is ionization into M
    2 plus
    .
    comprehensive above, high temperature anti-corrosion paint coating temperature to be high, coating to dense, corrosion resistance to strong, high temperature anti-corrosion paint temperature resistance of 2300 degrees C, the use of special silicon-oxygen-carbon synthetic high temperature inormeric re-modified solution and ultra-micro inormeric polymer Flaky metal oxides as fillers developed, coating long-term temperature resistance of up to 2300 degrees C, coating by heat and high temperature solution and filler lattice cross-linking, dense glass phase state, high temperature Tg phase boundary stability, can effectively prevent the invasion of oxidizing media, to avoid oxidation lattice production. Coating can be long-term fire-resistant barbecue, anti-oxidation and anti-corrosion effect in hot fire, effective anti-oxygen diffusion can reach more than 90%. High temperature anti-corrosion paint contains a large number of anti-aging corrosion-resistant factors and OH active groups, it and the active components in the filler and steel, or other materials active surface rapid cross-linking reaction, the formation of three-dimensional structure of inormeric polymer anti-corrosion coating, the coating and the substation into one, the formation of a heat-resistant high temperature anti-corrosion coating with electrochemical protection and physical shielding, especially suitable for working in high temperature, corrosion environment steel, or other material structure under long-lasting protection.
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