Primer for metal: how to choose? Overview of the primer for metal: characteristics and prices

In order to reliably protect the metal from negative corrosion processes, a primer must be applied. This composition can have a different purpose.

Types of primer

The primer for the metal is selected depending on the external conditions that will be maintained during operation, as well as the type of surface. Thus, the primer can be designed for application to non-ferrous or ferrous metals. Among other things, this composition can be designed to convert rust. There are phosphating, passivating, isolating, inhibiting and protective mixtures.

Phosphating mixtures are two-component bases that are made of orthophosphoric acid and a diluent. Use this mixture is possible for all varieties of metals. It improves the quality of the clutch.

The insulating primer is still alkyd or epoxy. It is designed to protect the surface from moisture and oxygen. In its composition - iron wax, zinc white, as well as fillers. This composition is most often used for ferrous metals.

Passivating primer for metal

It can reduce electrochemical characteristics. Promotes corrosion inhibition. If we talk about the inhibitory mixture, it forms a new kind of material on the surface of the type of enamel-soil, which combines the properties of the two compounds. The inhibitors that make up its composition may be aqueous or oil soluble.

Protective primer

It is designed to work with rusty surfaces. If you need a primer for metal, then you can choose the one mentioned above, it consists of a magnesium alloy with zinc, and also lead powder. On the surface after application, an invisible film is created, which is capable of protecting the metal base even when scratches occur. This was achieved thanks to the particles of zinc, which are part of the primer. It is often necessary to treat a surface that has already been subjected to rusting processes. There are also such primers, they are applied after surface cleaning. After the base becomes protected from moisture.

Features of choice and application

If you need a primer for metal, you first need to familiarize yourself with the criteria by which the choice is made. It is important to take into account not only the variety of metal, but also climatic as well as mechanical loads. After the master should become acquainted with the technology of application of the composition. Initially, the surface should be freed from the old coating, cleaned of dirt and dust, and also leveled. Among other things, it is necessary to degrease, as well as eliminate rust.

Primer for metal on rust should be applied by appropriate tools, this can be a brush, pneumatic sprayer or roller. If the second option is used, then the work can be completed in a shorter time, but such equipment is not always in the arsenal of the master, and it is not advisable to lease it to cover small areas. When buying materials it is important to take into account the consumption, on average this figure varies from 120 to 140 grams per square meter. This is true for applying two layers. It is this amount that is recommended by the manufacturer.

Over often it is applied a waterproof coating, in particular this applies to metal primers, which will be exposed to frost and snow. Whatever primer coat is applied, it is necessary to observe the conditions for humidity and temperature. As for the last range, it can vary from -10 to +25 degrees.

Features of alkyd primers for metal

Alkyd paint primer for metal can be used as an independent coating. The plus of such a composition is that it is not necessary to apply paint or enamel on top of it. Among the additional advantages, it is possible to distinguish the provision of excellent anticorrosion characteristics, as well as the possibility of applying to the surface that has been subjected to rusting processes. Thus, this indicates that the alkyd primer acts as a converter. The mixture is able to provide reliable protection against various weather phenomena, as for ultraviolet radiation, as well as temperature changes.

This composition has a high hiding power. Due to the fact that among the ingredients of the alkyd protection there is an aluminum filler, the described material provides additional wear resistance.

Overview of primers and their prices

If you need to purchase a primer, you should first get acquainted not only with the prices, but also with the manufacturers. For example, a primer of the brand LAKRA will cost 2000 rubles, this amount you will have to pay for 20 kg of the mixture. It has excellent quality characteristics and is able to protect the metal from external influences. Buying a Super structure with the same volume, the consumer will have to pay 1170 rubles. Covering the surface with this mixture, you protect it and prolong the life. If you need to cover the surface of a smaller area, you can buy a mixture of the first mentioned mark in the amount of 1 kg, in this case you have to give 120 rubles in the building materials store. The material of the Dufa brand costs 1600 rubles for 2.5 liters. As for the manufacturer HAMMERITE, it represents for sale a primer for 1150 rubles. The bank will have a volume of 0.75 liters.

Conclusion

The compositions described differ in purpose and operating conditions. For example, a primer for metal for auto has corresponding characteristics. However, there are also universal mixtures, they are suitable for standard surfaces and for problem areas. Among the first, cast, forged, and other products can be distinguished, which have a slight roughness, increasing adhesive qualities, which is very good for priming work. Among the problematic bases are copper, aluminum, galvanized metal, as well as any other materials capable of giving a chemical reaction to the surface and reducing adhesion.

If you buy a primer for metal GF 021, then you need to read the manufacturer's recommendations. So, the bank can specify the time during which the composition is able to hold out on the metal. Anticorrosive features of the composition are also important. On all the above mentioned characteristics, it is necessary to pay special attention to the purchase of materials. It is from this will depend on the durability of the protective coating and the life of the metal itself. It is not necessary to save on the primer mix, it is better to purchase the goods of the manufacturer that has proven itself in the market of the relevant materials.