Galvanized metal is one of the most resistant to weathering materials. The advantages are simplicity and ease of use, allowing the use of galvanizing during the construction of private and public facilities. However, galvanized metal requires additional protection against corrosion and spraying. To avoid damage caused by corrosion, which provokes spoilage and failure of metal structures, it is recommended to use galvanizing paint.
- Galvanized metal and its advantages
- paint selection criteria The best choice for
- This is important
Galvanized metal and its advantages
In civil and private construction, in spite of a wide range of materials, the most priority is galvanized or galvanized sheet. This material is used for roofing works, for the construction of factories, office centers, private houses, industrial buildings, garages, warehouses, hangars.
Get the best characteristics, ensuring, first of all, the resistance of galvanized metal to the destructive effect of moisture and oxygen, allows the application of a small thickness to the surface of metal sheets of a zinc layer.
However, zinc coating does not allow achieving 100% success, since zinc itself also corrodes over time. Traces of its manifestation become noticeable on the surface of the metal in the form of a substance resembling a powder. This substance is called white rust. Thus, galvanized metal also requires additional protection in the form of staining with special paints, like a conventional iron without any coatings.
Criteria for the choice of paint
Painting metal surfaces with increased passivity is a prerequisite for extending the life of any metal structure. The main criterion that the paint must match for galvanizing is high-performance elastic and adhesive characteristics. Such characteristics do not possess, for example, oil paint and varnish materials. When applied to the surface of a metal, they cause chemical reactions that significantly reduce the adhesion properties of the paint itself. As a result, the coating applied to the surface quickly flakes off, and in a year a new painting of the structure will be required.
The best option is to choose from the following list of paint and varnish types for painting aluminum and steel structures, as well as galvanized metal:
Each type of paint has its advantages and disadvantages. For example, acrylic paints, produced on the basis of organic solvents, necessarily include special anti-corrosion additives. The surface formed after painting with acrylic paints, most often matte.
The coating has good resistance against atmospheric phenomena( which is especially important if it is required to paint the roof of galvanized metal), it is resistant to sun exposure, has an excellent water repellent effect, has good adhesive properties, long service life. Acrylic paints, which is important, attract attention to a completely democratic value.
Alkyd paintwork materials work well in a particular climate( for example, marine) or when using them to paint structures in an industrial environment.
Form a glossy coating, contain active anticorrosive pigments and have good performance characteristics.
Vinyl paints are not inferior to their predecessors in weather resistance. This kind of paintwork copes with the effects of high temperatures perfectly, is durable, although it requires several large financial investments.
A coating with a high degree of elasticity, based on acrylic and resembling rubber, is the result of rubber staining. The main advantage of this type of coating is its resistance to mechanical influences.
Thus, each kind of paint and varnish coatings has points in the list of advantages that distinguish it among other materials intended for the staining of galvanized metal. Therefore, when selecting, it is worth paying attention to the following characteristics:
- resistance to moisture;
- resistance to atmospheric effects and climatic conditions;
- long service life;
- absence of paint and varnish coating of harmful substances( ecological compatibility);
- resistance to the effects of chemicals;
- good decorative properties.
The best choice of
The enamel on galvanizing and rust has gained a special popularity among consumers, guided by the choice of paint and varnish coating with the above criteria. This kind of paintwork provides a significant extension of the life of any structure made of galvanized metal( roof, pipes). The cost of priming enamel exceeds the price of conventional paints. However, the result obtained after painting is worth the investment.
Alkyd primer enamel from Hammerite attracts high adhesive properties, the ability to create a durable coating and ensure a good appearance of the painted structure. In addition, this primer-enamel is directly applied to rust, dries quickly and does not suffer from exposure to ultraviolet rays. To additional pluses it is possible to carry a wide color scale.
Of course, the enamel from Hammerite is not a panacea. Among the minuses there is a demand for the choice of methods of painting( for example, when using a roller, air bubbles can form).In addition, insufficient degreasing of the surface leads to cracking, rust is formed about the third year after staining, and salt deposits appear even earlier.
The epoxy paint "Tikkurila" is less capricious. Withstands aggressive effects from atmospheric phenomena and chemicals, is able to withstand temperatures reaching + 80 ° C.
For domestic consumers it is important that it is possible to transport and store epoxy paint from "Tikkurila" even at serious minus temperatures. The only whimsy is that the coloring should be done in the hot season, since in this case the adhesion of the paint to the hot galvanized metal will be much better.
The necessary fire safety will be provided by galvanizing coating with the help of flame retardant paint for metal "Polystyl".This paint perfectly protects the construction in the event of a fire and is quite democratic value.
If it is required to increase the level of protection, then it is best to use the conductive paint "Zinga".This coating is an analogue of the production hot dip galvanizing due to the composition of 96% zinc. The impression of high anticorrosive properties and the absence of difficulties in work can slightly spoil the cost. But if you need good protection, you can not think about the price.
This is important
Regardless of the set of positive characteristics declared by the manufacturers, all the advantages of the chosen type of paint and varnish coating can show up only under the condition that the rules for preliminary preparation of the surface for painting are observed.
For galvanized metal, this is a one-year exposure or the so-called natural aging. It provides the appearance of roughness, which provides better adhesion. Having received help from nature, immediately before painting it is necessary to clean the surface of debris, rinse with fatty solution, grease, dirt, salt, and carefully dry the surface itself. Then apply the primer, and if this step can be skipped, then do the painting with enamel coating.