As you know, aluminum is quite difficult to stain, this is due to the fact that its coating is very smooth. The more complex the surface structure, the more rough it is, and the contact area with the material is larger. This characteristic is called peel strength. The problem of the complex application of the protective composition to the surface can be solved in two ways, one of them involves rough grinding, while the other involves acid etching. The most common way to prepare the described surface for further decoration is to apply a primer.
Characteristics of VL-02
Primer for aluminum VL-02 is a mixture of domestic production and is manufactured according to state standards. It consists of a base in the form of a suspension of zinc krona and an acid diluent. The first ingredient is a yellow anti-corrosive pigment, due to which the soil gains adhesion to complex surfaces. Among the additional characteristics of the base are impact strength and elasticity. As for the acid diluent, it is an alcohol in an aqueous solution of phosphoric acid. It guarantees etching of the aluminum surface during processing.
Application Features
In order to use the above primer for aluminum, it must be mixed and poured into an acid-resistant container, it can be a glass or polyethylene container. For 4 parts by weight of the base, add one part of the acid diluent. The resulting composition should be aged for half an hour, after which it must be mixed well. Exposure is required to maximize dissolution of polyvinyl butyral in an alcohol base. It is resistant to water, oxygen, but not alcohol. The shelf life of such soil is 8 hours. This mixture is applied to the surface for painting with a thin layer, which can be a limit of 6 to 8 microns. You can use a brush or spray gun. The drying step will take no more than an hour. Pay for a kilogram of such a composition will have about 110 rubles.
Features of Nerzhalux soil
If you choose a primer for aluminum, you may prefer Nerzhalux, which is an acrylic adhesive mixture for non-ferrous metals and aluminum. Among its characteristics:
- reliable adhesion with a finish coating;
- water resistance;
- weather resistance;
- increased adhesion to metals;
- short drying step.
With the help of Nerzhalyuks it is possible to cover not only aluminum, but also galvanized surfaces, as well as aluminum alloys. This one-component primer is intended for ferrous as well as non-ferrous metals based on modified acrylic copolymers. The mixture is used for the preliminary preparation of products from stainless and carbon steel, magnesium, aluminum, galvanized and titanium surfaces. This aluminum primer is able to provide adhesion of materials, resistance to water and steam, lubricants, mineral oils, sea water, kerosene, gasoline and other petroleum products. The mixture will help in the case when aggressive gases, salts, solutions of acids and alkalis will act on the surface during operation. This acrylic composition is used to obtain comprehensive anti-corrosion protection of the bases of building structures, which include:
- galvanized roofs;
- metal coatings;
- domes;
- hangars
- galvanized profile;
- gutter drains;
- details of machines and other metal products.
Method of use
Before using the primer "Nerzhalyuks" should be mixed well until smooth. Application must be carried out on a dry surface that has previously been cleaned of rust, dust, dirt and oils. If rust is present on the surface, clean it to a degree of Sa 21/2, using the abrasive blast cleaning method. When applying, you can use a roller, brush, airless spray or pneumatic tool. If necessary, the primer can be diluted to working viscosity, while you can use solvents R-648 or R-5A.
Temperature mode
The above-described aluminum primer for boats will dry up to 3 degrees within half an hour, but only if the room temperature is maintained within 20 ° C. After drying at a temperature of 20 ° C, it is possible to apply the following layers of varnish and paints and varnishes. It is necessary to use the soil at a temperature range from +5 to +30 ° C, while the room must have a relative air humidity that does not exceed 80%.
Consumption and Precautions
Before purchasing a primer, it is important to familiarize yourself with the consumption of the composition, which can vary from 80 to 120 g / m 2 , this is true if the thickness of one layer is equal to the limit of 8 to 15 microns. Professionals advise applying about 2 layers. On sale you can meet this primer, which is presented in a yellow base color. When applying this primer, it is important to observe safety precautions. When carrying out internal work and after their completion, it is necessary to ventilate the room, and in the process of applying the mixture, personal protective equipment should be used. The cost of one kilogram of such a primer is 233 rubles.
Primer Description Body 960 Wash Primer
Such a primer for aluminum (aerosol) is easier to use. For example, the Body 960 Wash Primer is sold in various packages, including in the form of an aerosol. The mixture is a high-quality anticorrosive acid-curing primer, which is made on a polyvinyl butyl base. It must be mixed with an activator and is intended for complete and topical use. With it, you can pickle the rust and not allow it to spread further. This mixture has high adhesion quality with non-ferrous metals. After completion of the drying phase, it guarantees corrosion protection of the surface. Drying of the applied layer takes 10 minutes, after which the base does not require grinding and must be painted with any two-component mixtures. Using this primer, you can protect aluminum from salt, moisture, and also give the surface characteristics of resistance to atmospheric, mechanical and chemical influences.
special instructions
Body 960 aluminum primer can be dried by air, at which the minimum temperature should be 15 ° C. Do not use the wet on wet method when applying this composition. It is not recommended to apply polyester-based materials to acidic soil, among which, for example, putty. If after completion of work about an hour has passed, then the soil should be treated with an adhesive tape primer, which will increase the quality of adhesion.
Features of use
The above-described acidic primer for aluminum must be mixed before use until a uniform consistency is obtained. The mixture is toxic, therefore precautions should be observed. At 20 ° C, the surface reaches a density of 0.85 kg / l. One liter of the mixture will be enough for 10 m 2 of the base, which is true if the thickness of the formed layer is 10 microns.
Quality alkyd enamel primer
Primer-enamel for aluminum is available for sale as an alkyd mixture PF-115. It is characterized by high adhesion to metals, and also has the quality of resistance to any weather conditions. After drying, fuels and lubricants can act on the surface. Between layers it is necessary to maintain time which will be required before complete drying of a surface. If the paint has a too thick consistency, the drying period may be delayed by 5 days.
Conclusion
Speaking of the above, it can be noted that to protect the described surfaces, not only VL-02 aluminum primer can be used, but also other effective compositions. Which one to choose is up to you.