While hot
Protection of metal against high temperatures and corrosion
As a rule, heat-resistant protective enamels for metals also have anti-corrosion properties. It is known that central heating radiators and other metal objects subject to constant heating can not be painted with conventional paints, such a coating will not last for a couple of months. Special heat-resistant coatings are required. They not only decorate the product, which is used in harsh conditions, but also protect it, significantly prolonging the service life.
Of course, heat-resistant paints are more expensive than conventional ones. And in order not to make a mistake in choosing, it is necessary to determine in which temperature range each of them will be operated. When heated to 100 ° C( in this mode heating radiators work), compositions based on alkyd and acrylic resins are needed. Heating up to 200 ° C involves the use of hybrid materials - silicone-epoxy and silicone-acrylic. Interval 200-400 ° C requires single-component paintwork based on ethyl silicate and silicone resins. Finally, with a temperature regime of 400 ° C and above, one-component polyorganosiloxane coatings should be used. The latter include, in particular, the heat-resistant colored enamel "Zerta" produced by the scientific and production enterprise "SPECTRUM".It can be operated with heating up to 750 ° C, which makes it suitable for finishing fireplace grates, barbecue, sauna stoves and other items directly in contact with fire.
However, the metal field of application of "Zert" is not limited. It is used for painting concrete, brick and cement surfaces, and not only exposed to heat. From the decorative point of view, "Zerta" is also attractive, since it forms a clean, matt surface( black, chocolate or terracotta), pleasant to the eye, but sometimes this is not enough. For those who want to make the painted metal even more expressive, the heat-resistant enamel "Zerta-Patina" was developed. It can transform an ordinary fireplace screen, giving it the appearance of an antique piece made of old bronze or red copper. And even when heated to 700 ° C, the coating will not lose its beauty.
In the series of heat-resistant paints are allocated the so-called forge, intended for forged products. As an example, we will mention the primer enamel Zerta-Plast, which solve the whole complex of problems and problems associated with metal. The coating protects from heating to 150 ° C, prevents moisture and aggressive chemicals, and also effectively resists corrosion.
The guaranteed service life of such a coating is at least 10 years. The latter is especially important for forged products. It will be insulting to see how balcony fences or garden furniture, which cost the owner of considerable money, rust and lose their appearance. And to process ground-enamel it is possible not only new items, but also those that are already touched by rust. Soft scale before cleaning is scraped, and the residual layer, which can not be removed, is converted by enamel, and the process of metal breakage stops. But of course, forged products are painted not only for the sake of protection. On the basis of "Zerta-Plast" you can get a variety of decorative coatings: matte, semi-matt, semigloss, "metallic", with a hammer effect, more than 50 colors and shades. And if this is not enough, you can walk over the enamel described above.
And finally, a few words about how to paint the surface, subject to heating. First of all, it should be rough, which means that the products need to be treated with a sandblast or abrasive tool. Metal must be degreased with a solvent of the same type that is part of the chosen paint, according to the principle "like with the like."Apply a very thin layer of coating( not more than 50 microns), and it is best to do this by spraying. It is important not to let naked.
Items that are heated to 100 ° C can be painted with a spray gun and brush in two layers, using material of different colors - for example, first gray, and then black. But with a stronger thermal effect, the products should be painted in 2-3 layers and only with the help of a spray gun.
"As is known, it is better to apply heat-resistant enamels with a spray gun on the principle" the higher the heating, the thinner the layer ".As for the patina, there are several surface finishing technologies. The most popular is the so-called "dry brush".Before use, "Zerta-Patina" should be thoroughly mixed, and then slightly dipped into it a flat brush. Excess paint to grind on the palette, and after a light movement to walk through the most protruding sections of the relief, without overlapping completely the previous layer of paint. If the area of the decorated object is large and the work needs to be done quickly, you can put a cotton glove on your hand, apply a little money to it and patinate the surface simply by touching it. And finally, you can use a spray gun.
Remember, the further the sprayer is from the finished object, the more transparent the patina. Combining paint and patina, you can achieve a wide variety of decorative effects. Blacksmiths are very popular now with juicy pearl color combined with gold. In my opinion, copper is very effective, slightly shaded with the same gold. But there are many other options. "
Anticorrosion protection of metal
If the product is already damaged by corrosion, it is first of all necessary to remove the scale with a metal brush. Further on, a rust converter is applied to the surface, which neutralizes what has not been mechanically removed. The next layer is a primer. It is necessary in order to isolate the metal from contact with moisture and to ensure good adhesion to the paint. Only after the drying of the soil can you proceed to staining. However, there are special enamels( ground-enamel "Zerta-Plast" 3 in 1 "), combining both a rust converter, and a primer, and a decorative coating.
