Premium
Corrosion in Aqueous Solutions and Corrosion in Gases at Elevated Temperatures – analogies and disparities
Author(s) -
Wagner Carl
Publication year - 1974
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.19740250302
Subject(s) - corrosion , passivation , aqueous solution , scaling , electrochemistry , salt (chemistry) , chemistry , materials science , kinetics , inorganic chemistry , metallurgy , thermodynamics , electrode , mathematics , nanotechnology , physics , geometry , layer (electronics) , quantum mechanics
On the basis of some examples of corrosion in the two media mentioned above the author shows that electrochemical mechanisms of corrosion can be postulated with aqueous solutions as well as with hot gases and salt melts. In quite a number of corrosions the action of local cells comes to bear. On the basis of these data it is possible to define analogies between high temperature oxidation and passivation in solutions. Disparities exist, however, with respect to the kinetics of these processes because the rate can be controlled by very different reactions. Analogies are equally found in the case of inhibition where certain inorganic substances act as inhibitors even at rather high temperatures. The analogies and disparities considered here, are not restricted to pure metals but are equally applicable to alloys where it is possible to find analogies e.g. in the case of the scaling and acid resistance of alloyed steels.