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    Corrosion protection

    Q: What is the corrosion of metals?
    Corrosion – This process of destruction of the surface of metals under the influence of chemical and electrochemical effects of the environment surrounding them. Experts estimate the total damage industrialized countries corrosion of metals up to 4-5% of national income. Regardless of the type of construction and conditions of use the most simple and affordable way to combat corrosion is the use of protective coatings (LCP).
    A:
    LCS easy to applying, updatable, create a decorative background. The protective effect is due to their mechanical or insulation surface, either chemically and electrochemically reacting the coating and the surface. The main disadvantages are their most LCP limited steam, gas – and water permeability, and in some cases, insufficient thermo – and frost resistance.
     
    Q: How to protect metals from corrosion?
    Modern protection of metals from corrosion is based on the following methods:
    A:
    •     high chemical resistance of structural materials;
    •     insulation of the metal surface from aggressive environments;
    • decrease the aggressiveness of the working environment;
    • decrease the corrosion of the external current overlay (electrochemical protection).   
     
    These methods can be divided into 2 groups. The first 2 methods are usually implemented before the start of operation of metal production (choice of structural materials and their combinations at the stage of designing and manufacturing products, the application of a protective coating). The last 2 methods, in contrast, can only be performed during the operation of metal (passing a current to achieve the protective potential, the introduction into the process of special additives inhibitors) and are not related to any pre-treatment prior to use.
    The second group of methods allows to create new modes of protection to ensure the lowest corrosion products. For example, in some parts of the pipeline, depending on the aggressiveness of the soil can be changed cathode current density. Or for different grades of oil pumped through the tube, using different inhibitors.
     
    Q: How are corrosion inhibitors?
    To fight corrosion, metal corrosion inhibitors are widely distributed, which in small quantities are entered in an aggressive environment and pose on a metal surface adsorption film, retarding electrode processes and changes the electrochemical parameters of the metal.
     
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    Q: What are the ways to protect metals from corrosion with paint materials?
    Depending on the composition of pigments and film-forming coatings foundations can serve as a barrier or passivating tread .
    A:
    Barrier protection – a mechanical insulation surface. Violation of the integrity of the coating, even at the level of occurrence of microcracks determines the penetration of aggressive environment to the base and the emergence podplenochnoy corrosion.
    The passivation of the metal surface by means of LCP is achieved by the chemical interaction of metal coatings and components. This group includes primers and enamels containing phosphoric acid (phosphating), as well as compounds with inhibiting pigments, slow or prevent corrosion.
    Sacrificial protection is accomplished by adding metal coating material powder metals, creating a protected metal donor electron pairs. For those of steel are zinc, magnesium, aluminum. Under the influence of aggressive environment is a gradual dissolution of the powder additives and the base material is not subject to corrosion.
     
    Q: What determines the durability of the protection of metal from corrosion paints?
    First, the long-term protection of metal from corrosion depends on the type (and kind) applied paint . Second, the decisive role played by the thoroughness of the preparation of metal surfaces for painting. The most time-consuming process with a removal of the corrosion products formed earlier. Apply special formulations, rust destroy, and their subsequent mechanical removal of metal brushes.
    A:
    In some instances, removal of rust is not practicable, that involves extensive use of materials that can be applied directly to the surface corroded – Paint over the rust. This group includes some special primers and enamels used in multilayer or self-absorbed.
     
    Q: What is highly filled two-component systems?
    It – anticorrosion coating materials with reduced solvent content (percentage of volatile organic compounds in them does not exceed 35%). In the market of materials for home use mainly offers one-component materials. The main advantage of highly filled systems compared to conventional – significantly better corrosion resistance comparable with the thickness of less material consumption and the possibility of applying a thicker layer that provides the necessary corrosion protection of just 1-2 times.
     
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    Q: How to protect against destruction of the surface of galvanized steel?
    Anti-corrosion primer based on modified resin solvent vinilakrilovyh « Galvaplast » It is used for interior and exterior use on substrates made of ferrous metals with a descaling, galvanized steel, galvanized iron. Solvent – White Spirit. Application – brush, roller or spray. Consumption 0.10-0.12 kg/m; drying for 24 hours.
     
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    Q: What is patina?
    Word « Patina » denotes the film in different colors, formed on the surface of copper and copper-containing alloys under the influence of atmospheric factors under natural or artificial aging. Sometimes called a patina on the surface of metal oxides, as well as the film, causing fading with time on the surface of the stone, marble or wooden objects.
    A:
    The appearance of the patina is not a sign of corrosion, it is probably a natural protective layer on the copper surface.
     
    Q: Is it possible to artificially create a patina on the surface of copper products?
    In vivo green patina formed on the copper surface for 5-25 years, depending on climate and chemical composition of the atmosphere and precipitation. At the same time, copper and its two main alloys – bronze and brass – formed copper carbonate: bright green malachite Cu 2 (CO 3 ) (OH) 2 and azure-blue azurite Cu 2 (CO 3 ) 2 (OH) 2 . For zinc-containing brass, the formation of green-blue rozazita composition (Cu, Zn) 2 (CO 3 ) (OH) 2 . Basic copper carbonate can be easily synthesized and in the home, flushing an aqueous solution of soda ash to the aqueous solution of salts of copper such as copper sulfate. In the beginning of the process, when there is an excess of copper salt produced a product that is closer in composition to azurite, and at the end of the process (with an excess of soda) – to malachite.

    A:

    Conserving staining


     
    Q: What coating for metal are the most common among domestic paint?
    Alkyd enamels PF-115 « Standard » and PF-115 « Economy » widely used for interior and exterior use on metal surfaces. Enamel coating is formed, resistant to water, detergents, industrial oils, resistant to temperature changes from the – 50 to +60 & deg; C. Solvents – solvent, white spirit. Consumption of 100 and 150 g/m; drying 24 and 12:00.
    A:
    Primer GF-021 is used for coloring metal surfaces under a covering by various enamels. It provides a high-strength compound of the surface and the paint, prevents delamination, provides extra protection against corrosion. Solvents – solvent xylene. Flow – 150-200 g/m².
     
    Q: What paints are applied to previously painted metal surfaces?
    Paint Expo Fasadakrylat can also be used for coloring tin or aluminum surfaces outdoors. Suitable for use on new or previously painted surfaces. It has good adhesion to surfaces coated with latex, oil, alkyd paints. Yellowing does not become brittle on aging, loses luster and color over time. Consumption of 6-8 m/l. Drying 3:00.
     
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    Q: What is the coating used to repair damaged metal surfaces?
    « Universalspactel » (soil) – This particulate cementitious compound grayish white alkyd resin modified with styrene. It is used for the production of both small works on filling and patching, and solid recovery of metal surfaces of large area. It can be applied coatings containing strong solvents (cellulose or alkyd paint). Solvent – alkyd resin modified with styrene. Drying – 2:00.
     
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    Q: What paints can be painted metal fence, banister?
    Almost any, with certain limitations set forth in the specification. There are special paints.
    A:
    Plomb Hammarlack – This gloss alkyd paint that creates a surface similar to the enamel with a hammered finish. Apply for application to most metal surfaces in the room and outside it: mailboxes, stair railing. It is possible to paint the bike, the wheels of cars. HT-63 solvent; consumption of 0.12-0.16 l/m; drying 1:00.
    Syncrom – alkyd finishing paint for metal surfaces indoors and outdoors.
    Syntem Lackfarg – thixotropic alkyd paint for metal surfaces indoors and outdoors. Use on new or previously painted surfaces of iron: fences, railings, equipment, tools, parts. Solvent – White Spirit. Consumption 0.10-0.12 l/m; drying 1:00.
    « Korrostop » – alkyd paint, primer with anticorrosive pigments. It is used for painting stairs, tanks, reservoirs, radiators, ledges, flag poles, water pipes. It forms a coating resistant to abrasion and lubricating oil, turpentine, industrial alcohol. Not resistant to strong solvents. Cold hardiness. Application: brush, spray. Solvents – white spirit, white spirit. Consumption 0.08-0.10 l/m; dry 24 hours.
     
    Q: What clearcoats used on metal surfaces?
    Aqva Decor and Klarlack 15, 40 – clearcoats as acrylic water-based emulsion. Used for applying a protective coating in decorative painting. Yellowing, are resistant to wear and scratches. Solvent – water. Consumption 0.08-0.09 l/m; dry 16 hours.
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    Syntem Klarlack Blank & amp; Halvmatt – clearcoat alkyd based coating steel indoors and outdoors. Use when applied to the painted surface to create gloss and semi-gloss surface. Solvent – White Spirit. Consumption 0,09-0,10 l/m; drying 6:00.
     
    Q: What paints are used for painting steel surfaces, as well as copper, aluminum and light alloys?
    There are many multifunctional coatings. Suitable enamel EP-1333, EP-5321, EP-1236, resistant to weather conditions, moisture, hot water, oil, corrosive environments, mechanical shocks. Painting is carried out without priming. Application – spray, brush, roller. Solvents – P-5, P-4, № 646.
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    Enamel EP-140 (solvent F-5A) is used for coloring surfaces used in temperate and cold climates.
    « Sadoprimer 541 » – fast drying, one-component filling primer. Characterized by high adhesive ability and anti-corrosion properties. Used for coating the surface of the fat-free, steel and zinc; on the old cleaned and sanded surface, painted non-thermoplastic paints. You can cover the nitrocellulose lacquers, synthetic-alkyd, acrylic enamels. Consumption of 0.8 L/m; drying of 0.5-1.0 hours.
    may also be used: Enamel EP-140 M, semi-gloss alkyd paint « Panssarimaali », alkali-resistant matte paint on acrylate-based « Yuki », alkali-resistant acrylate paint « Hansa Sokkel », enamel TO HS- 5146.
     
    Q: What kind of paint can be applied to protect the non-ferrous metals?
    Acrylic Enamel « Svyatozar-60 » It forms a waterproof coating for non-ferrous metals. Do not darken on the pipes and radiator. Resistant to temperature changes; weatherproof. Solvent – water.
    A:
    « Svyatozar-25 » – Acrylic paint has excellent adhesion to primed metal. Solvent – water. Consumption 130-170 g/m; drying, respectively 3 and 1 hour.
     
    In the conditions of the special complexity

     
    Q: What kind of paint-coated heaters with temperatures up to 90 & deg; C?
    « Vivatix » – thixotropic paint, alkyd. Coating is resistant to abrasion, to washing, animal oils and lubricating greases, the effects of chemicals. Application: brush, spray. Solvent – white spirit. Consumption 0.08-0.10 l/m; dry 24 hours.
    A:
    You can also use acrylic paint for heating systems. Water-soluble, non-yellowing. Consumption 0,11-0,17 l/sq.m.
     
    Q: What paints can be used on metal surfaces with temperatures up to 120 & deg; C?
    « Universal » – alkyd paint, white, with a glossy sheen koleruemaya. The coating has good weather resistance, resistance to abrasion, washing, solvents (turpentine, mineral spirits, of ethanol but strong), animals, lubricating oils and greases. Application: brush, dipping, spraying. Solvent – White Spirit. Consumption 0,07-0,12 l/m; dry 24 hours.
    A:
    Superlak for heating systems based on artificial pitches. Fast drying, temperature stability up to + 120 & deg; C, non-yellowing. Consumption 0.08-0.12 l/sq.m.
    « Vivator » – thixotropic paint, alkyd, white, koleruemaya, semi-gloss sheen. For interior work on the metal surfaces, heating radiators. The coating has good resistance to abrasion, washing, solvents (turpentine, white spirit, methyl alcohol), but is unstable to strong solvents. Application: brush, roller or spray. Solvent – white spirit. Consumption 0.08-0.10 l/m; drying – 24 hours.
     
    Q: What colors can be painted metal surfaces silnonagrevaemye?
    silver enamel PF-837 ​​is used for coating surfaces exposed during operation to high temperatures. Application: spray. The solvent was PC-2. Consumption 0.05-0.09 l/m; drying 1:00.
    A:
    « Aluminiumfarg » – aluminum glossy paint, resistant to heat to a high temperature, which is used as a binder resin coumarone. Use for coloring hot surfaces: the surface of furnaces, boilers, furnaces and hot pipes indoors. It withstands temperatures up to 800 & deg; C. Application: spray. Solvent – White Spirit. Consumption of 0.08 l/sq.m.
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