In order to reliably protect the metal from negative corrosion processes, a primer must be applied. This composition may have a different purpose.
Primer varieties
The primer for metal is selected depending on the external conditions that will be maintained during operation, as well as on the type of surface. Thus, the primer may be intended 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, which are made from phosphoric acid and diluent. You can use this mixture for all types of metals. It improves grip quality.
Insulating primer can also be alkyd or epoxy. It is designed to protect the surface from moisture and oxygen. In its composition - iron minium, zinc white, as well as fillers. This composition is used most often for ferrous metals.
Passivating primer for metal
It can reduce the electrochemical performance. Helps slow down corrosion. If we talk about the inhibitory mixture, then it forms on the surface a new type of material similar to the enamel-primer, which combines the properties of the two compositions. The inhibitors it contains can be water 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, as well as lead powder. After application, an invisible film is created on the surface, which is capable of protecting the metal base even if scratches occur. This was achieved thanks to the zinc particles that are part of the primer. Quite often there is a need to treat a surface that has already been subject to rusting processes. There are also such primers, their application is carried out after cleaning the surface. After the base becomes protected from moisture.
Features of selection 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 type of metal, but also climatic and mechanical loads. After the master must familiarize himself with the technology of applying the composition. Initially, the surface must be freed from the old coating, cleaned of dirt and dust, andaligned. Among other things, it is necessary to carry out degreasing, as well as to eliminate rust.
Metal rust primer should be applied with the appropriate tools, it can be a brush, pneumatic sprayer or roller. If the second option is used, then the work can be completed in a shorter time, however, such equipment is not always in the arsenal of the master, and it is not advisable to rent 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. This is the amount recommended by the manufacturer.
A moisture-proof coating is often applied over the top, especially for metal primers that will be exposed to frost and snow. Whatever primer is applied, it is necessary to comply with 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 advantage of this composition is that it is not necessary to apply paint or enamel on top of it. Additional benefits include the provision of excellent anti-corrosion characteristics, as well as the possibility of application to a surface that has been subject to rusting processes. Thus, this indicates thatthe alkyd primer acts as a converter. The mixture is able to provide reliable protection against various weather phenomena, with regard to ultraviolet radiation, as well as temperature extremes.
This composition has a high hiding power. Due to the fact that among the ingredients of 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 familiarize yourself not only with prices, but also with manufacturers. For example, a primer brand LAKRA will cost 2000 rubles, you will have to pay this amount for 20 kg of the mixture. It has excellent quality characteristics and is able to protect the metal from external influences. When purchasing a Super composition with the same volume, the consumer will have to pay 1170 rubles. By coating the surface with this mixture, you protect it and prolong its life. If you need to cover the surface of a smaller area, then you can buy a mixture of the first mentioned brand in the amount of 1 kg, in which case you will have to pay 120 rubles in a building materials store. Dufa brand material costs 1600 rubles for 2.5 liters. As for the manufacturer HAMMERITE, he presents a primer for sale for 1150 rubles. The jar will have a volume of 0.75 liters.
Conclusion
The described compositions differ in purpose and operating conditions. For example, a primer for metal for cars has the appropriate characteristics. However, there are alsouniversal mixtures, they are suitable for standard surfaces and for problem areas. Among the former, cast, forged, as well as other products can be distinguished, which have a slight roughness that improves adhesive qualities, which is very good for priming work. Problematic substrates include copper, aluminum, galvanized metal, and any other material that can chemically react on the surface and reduce adhesion.
If you will purchase a primer for metal GF 021, then you need to familiarize yourself with the manufacturer's recommendations. So, on the bank, the time during which the composition is able to hold out on the metal can be indicated. The anti-corrosion features of the composition are also important. All the mentioned characteristics must be paid special attention to before purchasing materials. It is on this that the durability of the protective coating and the life of the metal itself will depend. It is not worth saving on a primer mixture, it is better to purchase a product from a manufacturer that has established itself in the market for the relevant materials.
