The influence of copper, molybdenum and silicon on the corrosion electrochemical behavior of austenite chromium-nickel steel

To the co-effect of impurity atoms and structure on the dissolution of iron and its low alloys

“…The dissolution of any step consists in the gradual step-by-step transfer of atoms from its kink to the solution. Based on this mechanism, the authors of [3,[5][6][7][8] came to a conclusion that in an alloy containing corrosionally resistant alloying elements, such a step-by-step dissolution inevitably leads to the accumulation of the atoms of these elements at the kinks, thus, hampering the next dissolution stage and, hence, the dissolution in general. Obviously, this blocking mechanism is valid also for the elements considered in this work, which confirms the applicability of the crystal-chemistry concept itself.…”

“…The phenomenon of such a many-fold deceleration of the active metal dissolution at low degrees of its surface coverage with a stable alloying component was discovered earlier in the investigation of the effect the alloying molybdenum and copper additions produced on the active dissolution of the low-doped and stainless steels [3,[5][6][7][8]. They supported the aforementioned crystal-chemistry concept of the metal dissolution [1 − 10], by which, at a quite low polarization, the dissolution proceeds at relatively innumerous active sites, which are kinks of incomplete atomic steps formed by the partially built atomic surface planes.…”

“…1) [19]. In turn copper, which inhibits the active dissolution of a stainless steel, slightly accelerates its anomalous dissolution [8]. Meanwhile, the direct transfer of electrons from ionizing atoms to reduced particles [21] should not be impeded by an increase in the activity of the atoms themselves.…”

“…As showed the investigations carried out in Karpov Institute of Physical Chemistry [1][2][3][4][5][6][7][8][9][10], when analyzing the nature and mechanism of the dissolution of metals and their solid solutions, one should take into account the submicrostructure factor relating the reactivity of the crystal surface to its atomic discreteness. The regularities discovered enabled researchers to formulate the following conceptual ideas taking into account both the role of this factor in the active dissolution of a metal and the dependence of its reactivity on the presence of alloying elements.…”