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Temperature Dependence of Pitting Corrosion in Cr‐Ni stainless steels
Author(s) -
Toušek Jaromú
Publication year - 1977
Publication title -
materials and corrosion
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.487
H-Index - 55
eISSN - 1521-4176
pISSN - 0947-5117
DOI - 10.1002/maco.19770280906
Subject(s) - passivation , materials science , atmospheric temperature range , dissolution , activation energy , oxide , pitting corrosion , range (aeronautics) , metallurgy , thermodynamics , corrosion , chemistry , composite material , physics , layer (electronics)
In the temperature range from 6 to 40°C the temperature dependence of pitting corrosion may be expressed by the Arthenius‐equation. The lowering of the breakdown potential in this range shows a linear dependence on the reziprokal value of the absolute temperatur. From the temperature dependence of the breakdown potential and of current density it is possible to calculate the activation energy of dissolution within the pits (4,5 –4.8 kcal). In the temperature range from 40 to 70°C the temperature dependence of the breakdown potential is relatively small. This fact apparently indicates a change in pitting kinetics above 40°C. It is concluded from other results obtained that in this temperature range the formation of oxide layers in the pits is accelarating so that passivation is accelerated and the breakdown potential increases.