The corrosion rate also depends on the intense state of steel; With stresses within the elasticity, a certain increase in resistance was noted, which, apparently, is associated with the difficulties of the exit of atoms into the solution when enhancing the connections of the elastic state, in accordance with this, the resistance increases with a complex tense state.
However, stresses within elasticity can violate the integrity of protective films and then the development of corrosion will increase. With plastic deformations, corrosion increases not only due to damage to protective films, but also due to weakening of atomic ties. The corrosion ability of sharply reinforced parts of the metal, such as stretching, is especially great. In rested places, corrosion often goes into intercrystallite, which gives the most dangerous case of destruction. The initial forms of plastic deformations leading to the hardening of steel, if they are evenly distributed through the metal, reduce the development of corrosion. But with an uneven distribution (local roll), the resulting heterogeneity of the structure leads to increased corrosion.
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The tendency to corrosion also increases in places of concentration of stresses, in rivet holes, welds, etc. D. Finally, corrosion depends not only on external, but also on its own stresses. However, the influence of their own stresses on corrosion has not yet been studied.
Corrosion also depends on temperature; With an increase in temperature, it increases slightly. At high temperatures, the chemical corrosion of steel is obtained and the steel is covered with a dense film of the scale, which protects it from further corrosion after cooling. However, if, according to the technological process, scale cannot form, for example, on the head of a cooling rivet or on the surface of the seam, when removing slag at a sufficiently high temperature, there is a sharp increase in corrosion on the surface of the cooling metal. The tendency to corrosion of welds and rivets is also influenced by the difference in the chemical composition and structure of the base metal and metal of welds and rivets. Naked metal surfaces are sharply coordinated there, for example, after processing with a sandblasting apparatus.
