Metal, unless it is covered by a protective composition, reacts quickly to atmospheric moisture and covered with a touch of rust. As long as possible to maintain operation of metal constructions, they definitely need to be protected by primer and paints. The theme of this material from Housechief edition - primer for metal and especially its application.
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- 1 What primed metal
- 2 Types of primers and their properties
- 2.1 Phosphating primer for steel
- 2.2 Alkyd primer for metal
- 2.3 passivating compositions
- 2.4 inhibiting primers
- 2.5 primer sealer
- 2.6 Primers protectors
- 2.7 Primer, rust converters
- 3 Terms of primer selection metal
- 4 How to calculate the primer consumption
- 5 How to apply primer
What primed metal
Metal surfaces coated with primer to improve adhesion with paint and enhancing wear resistance refinishing.
During machining on the surface of metal parts formed tiny bumps and scratches. Target Primer - align them to subsequent coating looked perfect.
Types of primers and their properties
Thus, primers are divided into types depending on the type of metal and the properties of the paint of the future. there are universal groundsWhich are suitable for all types and specialized, providing reliable protection in each case.
Phosphating primer for steel
Phosphatizing metal parts made in a special bathroom, but this is not always technically possible. That's why the market can find etching primers, whereby the phosphating metal and covered with foil of polivilbutiralya.
This primer does not need a hot dryer, so it can handle the details of the assembled structure. This composition, due to its etching properties, allows to paint galvanized metal, which in all other cases quickly "resets" itself with any paint.
Alkyd primer for metal
Alkyd primers are considered universal. They confidently protect the metal from rust and are suitable for further use alkyd enamels.
passivating compositions
Passivating compositions reduce metal electrochemical activity and, due to this, to prevent its corrosion. Using these compositions known from ancient times, when the red lead was added dyes having such properties. Minium forms on the surface of the oxide film which protects the steel.
inhibiting primers
This is a relatively new compositions, which allow to create a combination of primer and enamel, demonstrating excellent barrier properties. Inhibitors are dissolved in water or oil.
Slightly soluble inhibitors of the popular products of the company "Victoria" brand Gremirust and Kornik.
primer sealer
Most soils have insulating epoxy. They biconstituent and mixed immediately prior to application. The exception is automotive primers that can be purchased in the form of aerosols.
He gives completely impervious cover layer which is not afraid of alkalis or acids. In addition, this primer is perfectly withstands even extreme mechanical impact.
Primers protectors
In such compositions contain finely divided zinc, in the amount of about 80-90% of the total weight. This composition has a lower electrode potential than the metal part, and, due to this, is its protection.
Such a primer is most often used for the treatment of ships and other structures operating in the aquatic environment.
Primer, rust converters
This is perhaps the most practical form of primers, which makes it possible to prepare the surface for painting, already touched by corrosion. Chemical elements in their composition is converted into insoluble iron oxides corrosive compound.
Modifiers in this case are the tannins and variations phosphoric acids. Some compositions, e.g., SF-1 of Brasco Inter even improves welds on metals.
Terms of primer selection metal
Do not buy a ground indiscriminately. It should be remembered that it is adjusted for the type of metal and under paint.
| metal type | View primer |
 | For conventional iron and iron is better to use compounds that affect the corrosion slowing. It insulators, rust converters and protectors. |
 | Nonferrous metals less fear of corrosion, is important for their qualitative adhesion to paint. To do this, more suitable etching primers, including those based on organic solvents. |
 | If details have clear signs of rust, use a converter, the coating material is an oxide film. These compounds reduced the surface and does not require its preliminary preparation, simply remove the pollution. |
How to calculate the primer consumption
Flow soil depends on the type of surface texture and mixtures thereof. Some thick coats are consumed more intensively than the liquid mixtures which may be applied by spraying.
For the presentation, you can bring the most popular mixture of GF-021. This is a popular alkyd primer that is suitable for finishing enamels. According to the manufacturer, the flow rate of the soil up to 100 g / m². If the composition thickens, the flow rate is increased accordingly.
It should be understood that this is the average flow rate, which may vary depending on the type of composition. Sometimes it is recommended to apply a first coat in several layers. It also affects the consumption.
How to apply primer
The primer may be applied by brush, roller or spray. It all depends on the density of the composition. Consumption for spraying will be greater than when applied by roller or brush.
There are some compounds that can be used in sub-zero temperatures. If you put the soil in several layers, the second layer, by default, will leave less material.
Example of the acid soil in this footage:
What kind of soil you have seemed the best when working with metal? Write about it in the comments!
