Primers for metals are intended to protect them from corrosion. They are applied to the prepared surface to be painted after drying and form a uniform film, which will ensure a quality application of paint. Primers for metal is divided into several types: isolating, passivation, phosphating inhibiting, protective and rust converters. Isolating Primer prevent the penetration of moisture and oxygen to the protected surface. Applied mainly to ferrous metals. One advantage is low cost.
Passivating primer help to reduce the electrochemical activity of the metal, ie make the surface chemically passive, which greatly slows down the corrosion coating. Phosphating primer noticeably easier color galvanized steel, to which most paints do not have sufficient adhesion. One of the New types of primers are inhibitory. Their structure introduced corrosion inhibitors, which led to the creation of a new kind of paints – primer enamel. The composition of protector of primers includes a large number superfine metal powders that perform security functions (the tread), namely, first to take the hit for the destructive effect on the metal surface.
When it is impossible to completely clear prepared by painting the surface, apply a primer – rust converter. After using them loose upper layer is easily removed from coating mechanically. Choosing the appropriate type of primer metal, you're ready to spray her. The layer should be thin compared with the outer layer of paint. The primer is applied by brush, roller, swab or a paint sprayer. If the surface coating has turned glossy, should be lightly cleaned with emery cloth her. This is done for better adhesion to subsequent layers of paint materials. At the end of priming can proceed to the following operations – Shpatlevanie and painting. Primer – an indispensable tool to combat atmospheric oxidation, one-or two-layer coating is performed before staining, in addition to the protective properties of telling a better topcoat adhesion to the substrate. When choosing composition is important to know that for various metals using different primers. This is the case when a label on the can "universal ground" should be taken skeptically. Ferrous metals require high corrosion protection, while the surface color in the applied composition should have a good adhesion.