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Books > Professional & Technical > Mechanical engineering & materials > Materials science > Mechanics of solids
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Electrocorrosion and Protection of Metals - General Approach with Particular Consideration to Electrochemical Plants (Hardcover)
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Electrocorrosion and Protection of Metals - General Approach with Particular Consideration to Electrochemical Plants (Hardcover)
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Corrosion by external currents (electrocorrosion) of metallic
constructions has to be regarded as a strongest factor of
aggressiveness in conductive aggressive environments. Corrosion by
stray currents of underground and underwater metal constructions
was comprehensively and profoundly studied long ago and it is
considered in this book only in the form of a review. The primary
attention is focused on corrosion by external anodic (mainly) and
cathodic currents of metal constructions in environments of high
aggressiveness typical for electrochemical plants of chemical and
non-ferrous metallurgical brunches of industry, where penetration
of the external currents (leakage currents) from the electrolytic
baths to the metal constructions is unavoidable.
Structural metals selected for the media of a high aggressiveness
are initially in a passive state that provides their corrosion
resistance at the absence of the attack by external currents.
However, under the attack by leakage current the metals are brought
out of the boundaries of their passive field and undergo intensive
corrosion damage.
A new approach to the problem of electrocorrosion protection of the
passive structural metals which is considered in this book consists
in keeping the metals attacked by external currents in the
boundaries of their passive field. The systems, developed in
accordance with this approach, are based on modification of
existing and on elaboration of new methods and means of
electrocorrosion protection. These systems take into account
corrosion and electrochemical characteristics of the aggressive
media (redox potential, conductivity etc.) and of the passive metal
(corrosion and activation potentials, current density in a passive
state etc) as well as sizes and distribution character of the
external currents.
Analysis of leakage current distribution in electrochemical plants,
character of their influence, methods of estimation of corrosion
stability of metallic structures in the field of external currents
and a lot of concrete examples of successful introducing of the
developed corrosion protection systems in many operating plants of
chemical and non ferrous metallurgical branches of industry are
given.
Features/ Benefits
New approach to the problem of protection from electrocorrosion,
taking into account the passive state of the metal in aggressive
media
This approach allows concentrating on the purpose of keeping the
metal in the boundaries of its passive field which opens
principally new ways to effective metals protection from
electrocorrosion.
Modifications of well known and principally new developed methods
and means of electrocorrosion protection are presented. The methods
do not require power sources and in most cases do not need
significant metal consumption. The expenditure for the maintenance
of these methods is minimal.
The set of the developed methods and means of metals protection
from electrocorrosion provides engineers, particularly, the
personnel of electrochemical plants in chemical and non-ferrous
metallurgic branches of industry with necessary accessible and low
cost solutions of protection from electrocorrosion of metallic
equipment at the stages of design and of operation.
New methods of estimation the stability of metallic structures in
the field of external current taking into account the size of
external current, accessibleparameters and electrochemical
characteristics of the metal, of the structures and of the
aggressive environment.
These methods allow to prevent electrocorrosion damage at the
stage of design and to estimate the danger of corrosion attack by
external currents of metallic piping and equipment operating in the
zones of influence of external currents.
Improved and new materials for stable anodes and cathodes for
protection of metallic structures against corrosion by external
anodic and cathodic currents, respectively.
These data enlarge the possibilities of metals protection from
electrocorrosion and make this protection more accessible and less
expensive.
Using sectionalization as method of effective protection of passive
metals with high activation potential values in the field of
external currents.
By using equation for calculation a permissible section length,
for example, for titanium piping in acid sulfate solution, it is
possible to attain by sectionalization a complete piping protection
from electrocorrosion without applying any additional means for
protection.
Data on the influence of structural features of metals (weld seams,
crevices etc) in the field of external anodic and cathodic currents
on the values of the activation protection.
These data must be taken into account when corrosion stability of
a metallic structure is estimated at the stages of design and of
operation in the field of external current.
Known and new data on the values and distribution of leakage
currents, on the methods and means of their reducing, on the action
character of the external anodic and cathodic currents on different
structural metals in various aggressiveenvironment, on estimation
methods of corrosion stability of metallic structures in the field
of external current and on the methods and means of their
protection from electrocorrosion are systematized in the book.
Systematized data on electrocorrosion and protection of metals,
especially in electrochemical plants allow using the book as a
guide for corrosion engineers end researchers and for the personnel
maintaining the equipment of all kinds of electrochemical plants to
analyze the corrosion state of the metallic equipment and to
prevent its electrocorrosion.
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