Anti-corrosion protection of metal - the main problem in solving the issue of ensuring the durability of metal structures. Under the influence of a complex of atmospheric influences and aggressive environments, metal structures lose their original appearance and lose their strength qualities. Therefore, the issue of anti-corrosion protection of metal structures is always very acute ..
Corrosion of metal is one of the significant problems arising in the production and operation of metal structures.
Corrosion Is a spontaneous process of electrochemical or chemical interaction between the metal and the environment, as a result of which the metal is oxidized and destroyed. According to experts, the damage from corrosion in industry is up to 4% of the gross national product of each state, while the loss of metal, including the mass of out-of-service metal structures, products and equipment, is up to 20%.
Anti-corrosion treatment - coating metal surfaces with a thin layer of another metal, alloy or non-metallic materials to protect them from corrosion. The relevance of anti-corrosion treatment is explained by the special intensity of metal corrosion processes in conditions of high relative humidity and atmospheric pollution.
There are three main types of materials for protecting metal structures from destruction and extending their operational properties.
Paintwork anticorrosive coatings - are distinguished by the simplicity of application, the possibility of choosing a color, the ability to process metal structures of large dimensions and complex configuration.
For surface treatment in order to protect against corrosion, prevent the destruction of metals and alloys under the influence of moisture, mechanical influence, factors of an aggressive environment, various types of paints and varnishes are used. Depending on the degree of destruction, requirements for further operation and coating conditions, processing technologies are used that use an anticorrosive coating, which is optimal in each specific case.
When choosing paints and varnishes, one should proceed from the tasks that the future coating is designed to fulfill. If a surface that is already exposed to the environment is subject to processing, then in this case it is worth using rust converters to eliminate the oxide layer, after which you can choose an anti-corrosion coating. Such primer-enamels for rust are designed to neutralize the corrosion layer of different thickness and are designed for use on various materials.
As in the case of the preparatory material, in order to choose a protective coating, it is necessary to take into account a number of factors that make it beneficial to use certain paints and varnishes. As well as applying zinc coating by traditional methods, cold galvanizing allows obtaining a layer characterized by a highly effective method of protection against mechanical damage.
Among the advantages of cold galvanizing in relation to conventional paints and varnishes, in addition to durability, increased resistance to various types of influences, it is also worth noting the electrical conductivity and fire safety of such a coating.
If the task is to treat parts that are operated at high temperatures, heat-resistant enamels and varnishes will help protect surfaces for a long time. Designed to work in a wide temperature range, heat-resistant paints are resistant to fire and heat, while retaining their protective properties for a long time.
Organosilicate compositions of various types are used for special operating conditions, such as: high humidity, high temperatures, chemically aggressive environments, increased radioactivity and their combinations. To create high-strength coatings, provide mechanical protection, waterproofing, decorative effect on various surfaces, polyurethane varnishes and enamels are widely used.
When working with forged products for the processing of non-ferrous and ferrous metals, special blacksmith paints are used. In addition to the protective properties that prevent the destruction of forged gratings, railings, gates, fireplaces and other metal elements, such forging paints help to create various decorative effects.
To protect the surfaces of forged products from rust, blacksmith paints and priming enamels are used, after which a patina can be applied to the metal, the use of which allows you to create a decorative effect of antiquity, with imitation of gold, silver, bronze, bluing, etc. The patina on metal, created by applying a special paint for forging, in addition to decorating the surface of the material, creates an additional protective layer, which, like a natural patina, prevents destruction under the influence of atmospheric precipitation, moisture, high and low temperatures, and mechanical damage. Timely protection of metal products increases the service life and prevents their early conversion into recyclable materials.