Such phenomenon as oxidation of metal and its gradual destruction under the influence of moisture is known as corrosion. But how to deal with it? If the rusted site is large, then it can be restored only by using complex works, but small areas can be really protected by applying enamels on rust.
- Varieties corrosion protection
- phosphating, two component
- materials How to choose a dye
- How to choose
- tool How to paint
Varieties corrosion protection
For small areas or for corrosion occurrence preventive usepriming enamel on rust. This paint combines three properties: enamel, primer and rust converter. But anticorrosion paints are only a general name for drugs that differ in their composition. Depending on the anticorrosive components included in their composition, they are divided into the following groups.
This primer-metal enamel after drying forms a strong film that blocks access to the base of water and oxygen. These dyes, as a rule, are made on the basis of a waxwood and additionally possess heat-resistant qualities.
These characteristics allow them to be used for street work and for painting surfaces in the water. Quick-drying: after 2-3 hours this coating provides reliable anti-corrosion protection.
This primer is used to slow the development of corrosion. The anticorrosive substances included in its composition by its chemical formula considerably slow down the course of oxidation processes. Suitable for use in places of high humidity.
It contains orthophosphoric acid. Acid after the chemical reaction with iron oxide( corrosion) forms a strong and inert to the oxidative processes of iron phosphate. The use of transducers allows not only to protect the structure from destruction, but also partially to repair the damaged metal substrate.
The composition includes orthophosphoric acid and passivation additives. Has a small consumption when applied to the surface, has a high adhesion. Coating with such paints is possible even for galvanized metals, which can not be treated with other anticorrosive agents.
Anticorrosive enamel with dissolved in it the smallest metal particles after drying forms a strong metallized coating. The use of paints with protectors is recommended in conditions of high humidity.
Quick-drying primer-paint not only has high anti-corrosion properties, but also is economical: its consumption per 1 sq.m is small.
Protectors are often used for painting boats or water piercing metal piers.
Has a unique formula in its composition. This primer enamel rust gives the oxidized structure after interaction with it the properties of the primer. Inhibitory paints are quick-drying and have high adhesive qualities.
To their downsides, it is possible to attribute a large, compared with other primer paints, material consumption, caused by a profuse impregnation of the structure of rust. But, despite this small drawback, inhibitory paints are most in demand for providing corrosion protection and decorative painting of metal products.
The dye selected in accordance with the specifications will stop corrosion only if:
- The rusting area is small.
- Rust has a strong adhesion to the metal base.
The use of paint three in one for large product damage or on a loose, fragile rusting area does not result in a positive anticorrosive effect. For such violations of the metal structure, major restoration work is required.
materials Among the available paints are Dali from Rogneda, as well as the enamel primer Stop rust. Consumption of "Stop rust" material is from 80 to 150 g per square meter. One liter of Dali paint, according to technical specifications, will cover 12 square meters.
How to choose the dye
Primer-enamel for rust, combining the properties of the decorative coating, primer and rust protection( three in one), it is recommended to choose the following parameters:
- Metal species. Depending on the variety of alloys, a type of corrosion protection is selected, as well as a variety of base( water or oil).
- Effects on the product( humidity, temperature differences, likelihood of mechanical damage).
- The degree of protection of the dye, which coating it forms on the surface( a kind of film for protection).
- The nature of corrosion( develops quickly or not, the size of the damaged area, etc.).
- Drying speed. For street work or when painting surfaces touching with water, quick-drying paints should be used.
- Toxicity. Most anticorrosive dyes, giving a durable protective coating, are highly toxic, so work with them is recommended in a well-ventilated area, using gloves and a respirator. The degree of toxicity can be determined by examining the composition indicated on the package.
- Efficiency. In most cases, anti-corrosion agents have a small consumption per 1 sq.m. Relatively high consumption is associated with either enhanced protective properties of the agent, or with looseness of the rusted surface.
- Decorability. Unfortunately, due to the peculiarities of the composition, all paints that help to prevent or eliminate small corrosion damage are produced only in black, gray or brown colors. But when you buy a dye, you should pay attention to the gloss: matte or glossy.
How to choose the tool
Most paints three in one contain aggressive chemical compounds that corrode artificial tissues. For applying the colorant on the metal base, the following painting tools are used:
- Brush. Because of the aggressive substances that make up the majority of primer paints, brushes should be chosen with natural nap. For an even distribution of the drug without sweating, masters are advised to purchase thick, broad brushes.
- Roller."Shubka" for a roller is better to choose from velor or polyacryl with medium or short nap. Before buying a roller is worth exploring to find out for which colorants it can be used.
- Spray gun. Only models that do not have plastic parts are suitable( plastic is deformed under the influence of anticorrosive substances).
- Balloon. The product released in cylinders, despite its economical consumption and ease of use, is rarely used due to the high price. It is recommended to use a balloon when it is necessary to paint a small area.
In addition to the instrument, the application of a coloring drug requires:
- metal brush;
- water and detergent;
Having prepared everything you need, you can start working.
How to paint
Before applying an anticorrosive enamel, the substrate must be prepared to work so that the coloring gives the maximum protective effect. To do this, you must do the following:
- Corrosion damage with a metal brush, removing crumbling pieces of rust. You can clean with a grinder with a suitable nozzle, except for the area affected by the rust. It is recommended to further polish the surfaces adjacent to it.
- Rinse thoroughly the area to be painted and thoroughly dry. Depending on the size of the object, it can be washed under running water, using a rag or using a portable car wash. The use of car wash, as practice has shown, gives a better surface cleaning due to the fact that water with detergent is supplied under pressure.
- To be treated with degreaser. As a degreaser, you can apply White spirit, gasoline or other quick-drying solutions. If there is no possibility to conduct a complete degreasing of the structure, then the solution must at least treat the rusty places. If you do not use a degreaser, then the adhesion of the primer-paint with the base will deteriorate significantly.
Only such preparation will help to say "stop" rust. After drying the degreasing solution, the dye can be applied. For a long-term result, experienced masters advise:
- Apply primer-enamel in at least 2 layers, and re-painting should be carried out only after the previous layer has completely dried.
- Apply the second coat after drying the previous one, but no more than 5 hours. If more than 5 hours have passed, then it is worthwhile to find out in the instructions the time of complete polymerization of the composition( usually 25-30 days) and only after this interval to apply a second coating. Neglect of this recommendation will lead to a decrease in the protective properties of primer-paint and to the fragility of the decorative finish.
If you choose the right enamel primer with corrosion protection, depending on the nature of rust and the operating conditions of the product, and also observe all stages of application of the colorant, you can get a reliable and long-term protection of the metal structure from the development of corrosion changes.