The method of approach for studying process of a loss of carrier ability of no centrally compressed rod contacting to an external aggressive medium is worked out. Taking into account of the phenomenon of damageability of a material of a rod, the equation of motion of destruction front and also the equation describing increase of its deflection are obtained and analyzed. It is noted that a loss of carrier ability of a rod is defined by priority of one of these two processes.

protrusion, damageability, damaged rod, aggressive medium.