Development of Views on the Mechanism of Nucleation and Development of Corrosion Pits on Mild Steels on a Basis of Results of Investigations Using Methods of Electroreflection Spectroscopy both Tunnel Microscopy and Spectroscopy

Issue 4(78) 2015
Pages 45-50

A.N. Podobayev1, I.I. Reformatskaya1, A.E. Afonkin2, A.G. Konstantinov1

1Moscow state university of mechanical engineering (MAMI)
2Karpov Institute of Physical Chemistry


Keywords: сorrosion, dissolution, carbon steel, low alloyed steel, ulcer, nonmetallic inclusion, kink, crossbar, plane, electroreflection, tunnel microcopy, tunnel spectroscopy

The mechanism of nucleation and development of corrosion pits on surface of mild and low alloyed steels is considered in view of comparison of the experimental data about rates of dissolution of various structural elements of a metal surface such as kink (ledge of a mononuclear step), edge and plane and the values of chemisorption rate of water on iron. It is shown that a main reason of pit corrosion is the accelerated dissolution of metal on a closed line, formed by intersection of a surface of metal with a surface of inclusion or a pore.