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August 12, 2017 18:08

Primer on metal - Tinkering protection for

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Why primed metal before painting?

Primer directly determines how strong is the layer of paint, which you apply to the metal.It promotes good adhesion of the paint and the surface.In addition, it also performs a significant and important role - protection against corrosion and rust.For metal products often fail because of it.

to metal damage was minimal, it is necessary to perform the full range of protection.Some kinds of primers are so-called rust converters.She covered metal that has corroded to extend the service life.

primer for metal surfaces divided into several types: insulating, phosphating, passivation, sacrificial, and inhibit rust converters.Consider every detail.

Varieties primer for metal

insulating forms a film that protects the surface from moisture and oxygen.Usually it is added zinc white, red lead and iron fillings.The most common are alkyd primer for metal GF-021 and EP-0010 epoxy.It mainly used to ferrous metals.The advantage can be regarded as its low price.

phosphating is used for the surface of the ferrous and non-ferrous metals.It makes easier to passivation, phosphating and it increases the adhesion.Generally, it is called a two-component, as it contains a base and an acidic diluent with orthophosphoric acid.

She also has another name - the primer for zinc, because it can be painted galvanized steel, to which the bulk of paints has no adhesion.But the final coating can be any enamel.These can be VL-02 and VL-023.

passivating reduces the electrochemical activity of the metal, significantly inhibits corrosion.Water, which falls through the metal coating dissolves some pigments contained in the layer.Representatives of this type are primed FL-03K and GP-0119.

Tread contains up to 90% of the metal pigments (zinc alloy with magnesium, zinc powder and lead).When interacting with the paint composition of the electrolyte with zinc powder by corrosion forms a dense impermeable film.

For film formation using an epoxy-polyamide compositions, alkyd-styrene resins, and others. If there is a scratch on the paintwork, the zinc metal particles protect, performing the function of the tread.Good

its use for corrosion protection of steel surfaces, which are in sea water.These are the 068 XC-primer, EP-057 and EP-0284.

inhibiting primer is becoming very popular lately.Corrosion inhibitors not only increase security, but create a new type of material - priming enamel.They combine the advantages of these two substances.Corrosion inhibitors are two types: water soluble and oil soluble.Available this brand as EP-0180.

rust converters used on the surface, which has already been removed rust or scale.Primer for rust in its composition is phosphoric acid.It converts the corrosion of iron into insoluble phosphates.Simultaneously with the transformation of the surface gets rust polymer film which makes the coating resistant to corrosion.Part of this action can be called the EP-0199 and the HV-0278.

How to choose a primer for metal and how to apply it?

necessary to consider several factors when selecting a primer:

  • which metal is processed;
  • under what conditions will be used (the aggressiveness of the environment, climate conditions, mechanical loads);
  • type of substance which forms a film.

After selecting the primer can begin to surface treatment.The first thing you need - is to check the existing coat of paint.To do this, make two cuts, stick adhesive tape between them and sharply tear it.If the paint has come off, then it will have to be removed completely.

Next you need to clean the surface from rust and other contaminants.After these procedures, you can begin to apply a thin layer of primer.Do it with a roller, brush and spray gun.

If the surface was glossy, then you need to clean it with fine sandpaper for better adhesion of paint.Only now you can begin to apply a coat of paint.

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