Coating general knowledge: classification of anticorrosive coatings with rust

Core tip: in recent years, steel has been widely used in various industries, and it is self-evident that its large amount and wide use However, 70% of steel production is in a rust prone working environment The direct economic loss caused by steel corrosion in the world is more than 700 billion US dollars every year, which does not include the indirect loss caused by steel corrosion For many years, scientific and technological personnel have been looking for a simple surface treatment construction technology and materials to solve the problem of derusting operation, and anti-corrosion coating with rust came into being There are five kinds of anticorrosive coatings with rust: 1、 Conversion type anticorrosive coating with rust is also called reactive type with rust Shenyang steel structure fireproof coating construction expert punde Building Fire Engineering Co., Ltd Recommended introduction: since its establishment, Shenyang punde Construction Fire Engineering Co., Ltd has cultivated a group of professional construction teams with excellent equipment, rich experience and serious responsibility with advanced and scientific management methods and strict engineering quality assurance and after-sales service system It has undertaken a number of fire system installation projects, which has been praised by customers Every idea and special requirement of you will be fully considered by us and fully realized in the construction technology, which will become the cornerstone of our successful long-term development We are looking forward to your invitation, to provide you with quality services and high-quality technical support! All construction coatings have passed ISO9001 Home of coatings news: in recent years, steel is widely used in various industries, its large amount and wide use is self-evident However, 70% of steel production is in a rust prone working environment The direct economic loss caused by steel corrosion in the world is more than 700 billion US dollars every year, which does not include the indirect loss caused by steel corrosion For many years, scientific and technological personnel have been looking for a simple surface treatment construction technology and materials to solve the problem of derusting operation, and anti-corrosion coating with rust came into being There are five kinds of anticorrosive coatings with rust: first, the transformed anticorrosive coatings with rust, also known as reactive anticorrosive coatings, can transform the rust produced by iron and steel under different working conditions into inert substances, and can seal the rust and isolate it from the external media It is a kind of coating that can transform the rust layer into inert and better adhere to the steel surface The commonly used conversion agents are phosphoric acid, potassium ferrocyanide and tannic acid The blue potassium ferrocyanate produced by the reaction of potassium ferrocyanide and rust is a kind of pigment with strong covering power; the complex of iron tannate formed by the reaction of tannic acid and rust can attach to the surface of iron and steel well; the surface of iron and steel can be passivated by the reaction of excessive phosphoric acid and rust 2、 This kind of coating mainly relies on the reaction group of resin and active pigment in the coating to react with harmful components in the rust to produce insoluble complex and stable ferric oxide, and passivate the metal surface, so as to achieve the purpose of rust prevention and stability The common active pigments of stable rust coating are chromate, phosphate, etc after hydrolysis, these pigments can produce chromic acid, phosphate, etc These acid substances can form acid complexes with rust in rust layer, so as to stabilize rust 3、 Permeable rust coating is a kind of rust coating with low viscosity, high solid content and strong permeability It generally does not react with rust, but uses resin with certain permeability, makes the coating have good permeability with the aid of the combination of penetrant and polar solvent, and seals the rust by wetting and penetrating the rust surface to make it with the outside world The corrosion medium is completely isolated so that the original activity of the rust is lost and further corrosion of the rust is prevented 4、 In order to supplement the shortcomings of the above three kinds of anticorrosive coatings, the functional anticorrosive coatings with rust, which have the advantages of stability, transformation and penetration, are prepared 5、 For the requirement of environmental protection, water-based coating is the future development direction Researchers use modified urea formaldehyde resin as film-forming assistant to add certain conversion agent and antirust pigment to develop a kind of water-based coating with rust Home of coatings is specialized in coatings, diatom mud, paint coating, coating technology, fire retardant coating news and coating, diatom mud, paint coating, coating technology, fire retardant coating decoration knowledge and decoration renderings,