Artistic forging - Zinc and corrosion protection.

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    Zinc and corrosion protection.

    Preparation of zinc in pure form can be attributed only to the XVI century. For feature articles alloys in which zinc is the main component, have been applied only in the XVIII century.

    Artistic forging metal - zinc and corrosion protection



    Zinc - a cheaper material in relation to copper and bronze, it is more fluid, it allows you to exclude the subsequent processing of the casting, and the difference in melting temperature of these materials allows manufacturers to save both energy and raw materials and manpower involved in the production process.

    Thus, the bronze has found a cheap substitute, not inferior to her at all in regard to the reproduction of artistic forms, but does not have that strength, which is still an integral part of its dignity.

    Zinc products are relatively resistant to corrosion, but the abuse of technology in casting and production of alloys and coatings, as well as the presence of aggressive environment (climate, urban smog) they lose their original form, being exposed to destruction. Already in the middle of the XIX century, experiments were conducted to test the corrosion resistance of zinc, copper and lead plates.

    The early stages of the producers, it was noted that the application of zinc on the oxidized surface of the oil paints and varnishes do not have much effect. After some time, coverage begins to crumble. Experiments were carried out to improve adhesion (bonding) surface of the castings with protective and decorative coatings.

    Among the coatings used for casting of zinc alloys, are known and polychromatic (paints, varnishes, and sometimes copper sulphate CuS04 to create a green, characteristic of the Bronze Age) and metal (sheet silver, gold, copper).

    Artistic forging metal - zinc and corrosion protection



    Among the Russian methods of obtaining the effect of the green antique bronze used the following method: surface-coated copper-zinc things wetting solution: 30 grams of ammonium chloride and potassium oxalate 8 grams per liter of vinegar.

    Solution was applied with a brush to get the desired result. In the second half of XIX century began to be used with electroplating cyanide. With the advent of the electrolytic method of production of articles covering the cost of zinc alloys decreased significantly.

    Corrosion products of zinc hydroxide may act mainly zinc and zinc carbonate in a variety of compounds that passivate the metal surface. Under the influence of sulfur dioxide, zinc sulphate is formed. As the final product meets and change the basic hydrated sulfate.

    In zinc alloys containing up to 5% of lead, lead sulfate can be formed. In locations where used gold or copper coating, as a result of galvanopary often a pass-through corrosion. Sometimes observed on the surface of the fat of the film from various sources.

    Most often, damage to the main monuments of zinc include fractures and deformation resulting from mechanical damage, and the main reason for the fragility of the objects of zinc is its coarse-grained structure, the cracks are formed as a result of violations of manufacturing technologies, as well as the result of intergranular corrosion.

    For example, corrosion of soldered joints and fittings is the result of galvanopary formed, the corrosion of the surface of the product - as a result of environmental hazards.

    However, to date, a cheaper and easier means of corrosion is not found. Zinc is used in paints for metals, such paints have proven effective. For nothing is more important metal corrosion, so corrosion treatment is better not to save money: In the future you will be able to avoid the additional costs of fighting already appeared rusty.

    There are many compounds that protect the metal. According to the principle of all coatings are divided into four main groups: passive, active, hybrid and transformative.

    Artistic forging metal - zinc and corrosion protection



    The active principle of the protective actions have coverage, which contain other metals, corroding instead of iron. They can be used cadmium, aluminum and some other metals, but as we mentioned above, cost and ease of use is zinc.

    Active coatings are obtained in different ways (by electrolytic deposition, by thermal diffusion, etc.) that require special expensive equipment, the availability of shops. Therefore, these methods are rarely used.

    Mixed coatings can combine the quality of active and passive type. For example, the coating filled with zinc, and provide both active and passive protection against corrosion. In order to select the correct coating of zinc is necessary to know the main thing: a dry layer of dried paint shall be not less than 94% zinc, or will not be provided the necessary protection activity. The abstract must be given the number representing the zinc content.

    Transformative principle of providing coverage, which contain substances that convert already appeared in the chemical corrosion of the neutral layer. So he stops the corrosion process. It is important not so much the quality of the paint, but the fact as prepared by the metal to its application.

    It should not be a scale, grease and dirt, then the defense will be really effective. If corrosion has already appeared, it too can be overcome. Most importantly - qualitatively clear space corrosion. But the most effective way, but it is not cheap is sandblasting.

    The easiest and cheapest is a passive barrier or principle of action. Ink used for this principle, to protect from corrosion appeared can not. Powder coating is sufficiently stable to corrosion. She baked electrostatic powder in a special chamber.

    The huge minus powder coating is that it can be painted only small items, and if suddenly the installation will spall, the product will have to paint again. When choosing colors, remember that its value ranges from 2 to 3% of the value of the product. So to save on wasted paint!

     








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