Anticorrosive coatings are essential coatings. Outdoor decorative materials will rot due to wind and sun. If you brush a layer of anticorrosive paint, you can solve this kind of problem. Where is the anticorrosive paint? What is the principle of anticorrosive coatings? Let's see the answers we will give you one by one.
How about anticorrosive paint?
1, which can be used in harsh conditions and has a long corrosion-resistant life. In chemical atmosphere and marine environment, heavy-duty anticorrosive coatings can generally be used for more than 18 years or 15 years, even in acid, alkali, salt and solvent media, at a certain temperature, they can be used for more than 5 years.
2. Thick film is an important symbol of heavy anti-corrosion coating. The dry film thickness of general anticorrosive coatings is about 100μm or 150μm, while the dry film thickness of heavy-duty anticorrosive coatings is above 200μm or 300μm, with 500μ m ~1000μ m.. ..
According to American NACE standard [PR-0 1-76( 1983) revised edition ItenNo.53 105, the corrosion resistance of ZS-7 1 1 coating was evaluated. Results The test of 4000h salt spray test and 4000h damp-heat test was successfully passed. The coating has excellent weather resistance, aging resistance, radiation resistance, wear resistance, impact resistance, high temperature resistance (400℃ ~ 600℃) and low temperature resistance (-60℃), and stable electrical conductivity. Its resistivity can meet the antistatic requirements and ensure the long life of the coating.
3. Strong adhesion: the coating has strong adhesion to the substrate, and the coating composition contains hydroxyl (-OH). The metal matrix provides positive ions, which can form chemical bonds, and even realize the combination of valence chains with the help of coupling agents in the coating. Supported by the spatial network structure, the metal, metal oxide nano-materials and rare earth oxide ultrafine powder contained in the coating composition help the coating to form a dense interface transition layer, so that its comprehensive thermodynamic properties match the matrix.
4. Efficient and convenient: the construction is simple, and the self-curing of inorganic coatings at room temperature is truly realized. When the ambient temperature is 20℃ and the relative humidity is less than 85%, the surface drying time is 15min, and it can work for 2 hours, which can not only ensure efficient construction, but also achieve excellent salt spray resistance and aging resistance. The coating has self-repairing renaturation, local scratches caused by external force can still be protected, the coating is not damaged by cutting and welding, and the welding with coating does not affect the welding quality.
5, flexible use:
Inorganic polymer anticorrosive coatings can be used alone, and can also be used as bottom anticorrosive coatings and organic coatings. Single-layer inorganic polymer anticorrosive coatings can be used with epoxy system, acrylic system and polyurethane system as primers.
① Excellent corrosion resistance: good adhesion, excellent corrosion resistance and long service life.
(2) Excellent construction performance: it can be cured quickly at room temperature like conventional anticorrosive coatings, and the construction is simple, and unskilled people can operate it (this is the main reason why chlorinated rubber heavy-duty anticorrosive coatings can be widely used).
③ Excellent environmental protection performance: the solid content of traditional solvent-based anticorrosive coatings can only reach 50-60%, while the solid content of high-solid anticorrosive coatings can reach 70-80%, even 90- 100%, and the solvent is reduced by nearly half, showing good environmental protection performance.
What is the principle of anticorrosive coatings?
1, chemical principle of corrosion protection:
The chemical principle of anticorrosion is to neutralize harmful acid and alkali substances into neutral harmless substances to protect the materials in the anticorrosion coating from corrosive substances. Amphoteric compounds, such as aluminum hydroxide, barium hydroxide, zinc oxide, etc., are often added to antirust coatings, which are easy to react with acid and alkali harmful substances to achieve anticorrosion effect.
2, the physical principle of anticorrosion:
The physical principle of anti-corrosion is to isolate the protected materials from the corrosive substances outside with anti-corrosion coatings. The physical principle of anti-rust paint is to use film-forming agent to obtain dense anti-corrosion coating to isolate the damage of anti-corrosion to protected materials. For example, lead soap can be formed after lead-containing paint reacts with oil to ensure the compactness of anti-corrosion coating.
3. Electrochemical function of anticorrosion:
The electrochemical function of anticorrosion refers to adding some special substances into antirust paint to make water and oxygen react when passing through antirust paint to form anticorrosive ions, so as to passivate the surfaces of metals such as steel, thus preventing the dissolution of metal ions and achieving the purpose of anticorrosion. The most common of these special substances is chromate.
The above is the anticorrosive paint that Bian Xiao brought you. How's it going? What is the principle of anticorrosive coatings? The whole content.