echemi logo
Product
  • Product
  • Supplier
  • Inquiry
    Home > Coatings News > Paints and Coatings Market > Introduction to the construction requirements and procedures of water-based rust coatings

    Introduction to the construction requirements and procedures of water-based rust coatings

    • Last Update: 2020-11-28
    • Source: Internet
    • Author: User
    Search more information of high quality chemicals, good prices and reliable suppliers, visit www.echemi.com
    Stable water-based rust coating
    stable water-based rust coating by the active pigment in the coating to stabilize the rust layer, the active pigment and rust layer between the slow solidification process, it usually takes 8 to 10 months to make the rust layer completely stable However, the water solubility of active pigments is larger, and the substitlytic material is based on reactive resin to stabilize corrosion, because the resin molecule contains high polarity of carboxyl, hydroxyl, phosphamide, etc. , they have a strong wetting effect, hydrophosphate is also strong.
    for the above reasons, primer protection is not good, early damage may occur, can not achieve the goal of stability. In order to solve this contradiction, it is very important to apply the middle protective layer to the primer to close, which is very important for rust coating
    the
    . A stable water-based rust coating based on alicic acid resin is suitable for water steel parts. By salt water, salt spray and atmospheric exposure test proved that this kind of rusty paint catch up with and exceed the same paint material of red Dan and iron red rust-proof paint. The thickness of the treated rust layer on the surface prior to painting can be controlled below 50 m depending on the variety formula. In order to ensure quality, it is best to use hand-painted two channels, the interval between layers is 24h, but the maximum not more than 2 weeks.
    A stable water-based rust coating based on epoxy has a good adhesion to steel, can be constructed on a steel plate with a thickness of 40 to 70 m of rust layer, and also has a good anti-rust effect on rust-free and oxide-free steel surfaces. Domestic has been used in the temperature of 280 degrees C within the aircraft steel parts. Stable water-based rust coatings based on epoxy resins and polyamides or other curing agents have better properties and are suitable for objects with high corrosion resistance requirements and have been used in ships, bridges, oil tanks, steel structure products, etc. in foreign countries.
    This kind of water-based rust coating on the construction surface requirements are wide, wide applicable, not transformed water-based rust paint so strict, generally does not contain phosphoric acid or other acid conversion agents, so in the corrosion is not equal, residual solid oxide skin or old paint film steel surface can be used, construction can be used directly as a primer, do not have to cover a layer of other models of primer.
    -transformed water-based rust coating
    -transformed water-based rust coating is suitable for rust is relatively uniform, and does not residual oxidizing skin and flaky thick rust steel surface (for maintenance re-painting should be removed from the old paint film), which is characterized by fast action, must be timely applied rust-proof primer and finish paint, in order to play a good protective role. The use of transformed water-based rust coating should pay attention to the thickness of the rust layer, uniformity and the quantitative relationship between the conversion fluid.
    can be different according to the thickness of the rust layer, adjust the ratio of the conversion liquid and film-forming liquid, as far as possible so that the conversion agent in the rust layer just the best reaction, so as not to leave potential harm. If the rust more conversion liquid is less, then the conversion is not complete, on the other hand, the paint film residual acidic medium, causing sub-membrane corrosion, for the uneven distribution of the rust layer surface is particularly prone to produce this ill, add corrosion inhibitors (such as thiophene, etc.) can be improved. Conversion fluid is mainly for loose rust reaction, and can not be firmly combined with the metal substrate, phosphate passivation layer lattice constant is also relatively large, coupled with hydrogen analysis, so adhesion is not very good, with tannin acid also exists membrane brittle problem, coating matching coating easy to cause early local foaming and other problems.
    construction, if the surface has old paint skin, should be shoveled off. It is advisable to use brushing method, brushing do not repeat, only apply a layer, otherwise it will cause excess free acid and affect the quality of the coating. It is important to note that when using this type of coating, you must also cover another type of primer after drying, and then put on intermediate paint, paint, otherwise it will seriously affect the anti-corrosion effect of the entire coating.
    permeable water-based rust coating
    Because of its good osmosis performance, it is suitable for old, but less chemical pollution of steel equipment surface, especially for the equipment riveting and bolting parts, the use of it is very good, can play a general coating difficult to achieve the protective effect, of course, the paint itself penetration The ability is relative, when the rust contains more active impurities, or the thicker rust layer completely penetrates there is a certain degree of difficulty, its permeability is greatly limited, it is not easy to wrap up all the rust, so that it is possible to continue to produce rust, and to a certain extent also affect the adhesion with the metal base surface.
    , it must be cleaned, otherwise it will still lead to rust, affecting the rust-proof effect of the entire coating. Construction methods and paint dosing, paint viscosity and curing speed, coating and substrate temperature, rust layer thickness, etc. all directly affect the paint on the depth of penetration of rust layer. Brush coating is conducive to the penetration of the paint on the rust layer, the brushing process by the pressure of the brush to promote the paint penetration.
    This article is an English version of an article which is originally in the Chinese language on echemi.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to service@echemi.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

    Contact Us

    The source of this page with content of products and services is from Internet, which doesn't represent ECHEMI's opinion. If you have any queries, please write to service@echemi.com. It will be replied within 5 days.

    Moreover, if you find any instances of plagiarism from the page, please send email to service@echemi.com with relevant evidence.