According to experts around the metal loss, including a lot of broken metal constructions, products, equipment, range from 10 to 20% of annual steel production. PAINT The first attempts to prevent corrosion are all sorts of ways than a "cover up" the metal – so the paint industry was born. First, of course, painted, than horrible. And I must say, paint a still, are particularly fond of this thing in the army, and especially in Ukrainian. Gradually became more and more perfect paint. The most sophisticated chemists today ponapridumyvali such paints that do not pronounce. For example paint "Hammerayt" is applied to rust, and contains just three ingredients – rust converter, primer and durable decorative layer.
Even invented polyurethane and epoxy paint – the last achievement of scientists in the fight against corrosion. Anything in the world are used tens of thousands of different colors, but alas, it's just zaschitametallicheskoy otkontaktas surface oxygen (so-called. Passive protection) and it operates from 4 to 10 years in any combination, the filling and the thickness of the paint layer. Paint is good when the life of the protected area (such as car body) is commensurate with the maturity of the paint. But what about the products, whose service is designed for decades? You can certainly paint again, but first, do not paint everything again (the underwater part of bridges, etc.) and, secondly, it is – repeated and more significant than in the first painting, money costs. Still, colors are very important – at relatively low cost they can protect not only new products but also designs that are in operation. Cathodic Protection The second and last major ways to protect metals from corrosion is cathodic (active) protection based on the electrochemical properties of metals, which, fortunately, rust (oxidize or corrode) with different speeds – copper and zinc, for example, several times slower than iron, sodium and magnesium – faster, gold and platinum – very slowly.