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Title: Introduction to corrossion
Description: Cambridge, edexcel syllabus followed notes for undergraduate and postgraduate students
Description: Cambridge, edexcel syllabus followed notes for undergraduate and postgraduate students
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Introduction to Corrosion
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Contents
´Introduction to corrosion
´Definitions
´How it happens / Mechanisms
´Thermodynamics of corrosion
3
Introduction to Corrosion
´Corrosion is an undesirable process
...
4
Sub topics of introduction part
´Causes of Corrosion
´Classification or theories of Corrosion
´Consequences(Effects) of Corrosion
´Corrosion Control (Protection against Corrosion)
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Causes
of
Corrosion
´ In nature, metals occur in two different forms
...
ØExcept noble metals, all other metals
are highly reactive in nature
...
environment to form stable compounds
called ores and minerals
...
corrosion resistance
...
g
...
E
...
Fe 2 O3 , ZnO, PbS, CaCO3 , etc
...
Dry or Chemical Corrosion
(II) Wet or Electrochemical Corrosion
This type of corrosion is due to Electrochemical corrosion involves:
the direct chemical attack of
•The formation of anodic and cathodic
metal surfaces by the
areas or parts in contact with each other
...
•Presence of a conducting medium
...
•Silver materials undergo
•Formation
of
corrosion
product
chemical corrosion by
somewhere between anodic and cathodic
Atmospheric H2 S gas
...
•Iron metal undergo chemical
This involves flow of electron-current
corrosion by HCl gas
...
Difference between Dry and Wet corrosion
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Table 3: Difference Between Dry and Wet Corrosion
Dry Corrosion
Corrosion occurs in the absence of
moisture
...
It involves direct attack of
chemicals on the metal surface
...
The process is slow
...
Corrosion products are produced
at the site of corrosion
...
The process of corrosion is
uniform
...
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Consequences (Effects) Of Corrosion
The economic and social consequences of corrosion include
I
...
II
...
III
...
IV
...
V
...
VI
...
g
...
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Definitions and Types
´Corrosion is the deterioration or destruction of metals
and alloys in the presence of an environment by chemical
or electrochemical means
...
”
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Corrosion Types
´General Attack Corrosion
´Localized Corrosion
´Galvanic Corrosion
´Environmental Cracking
´Flow-Assisted Corrosion (FAC)
´Intergranular corrosion
´De-Alloying
´Fretting corrosion
´High-Temperature Corrosion
11
How Corrosion Happens
Types of Dry or Chemical Corrosion:
1
...
Corrosion by Hydrogen
3
...
Galvanic (or Bimetallic) Corrosion
II
Title: Introduction to corrossion
Description: Cambridge, edexcel syllabus followed notes for undergraduate and postgraduate students
Description: Cambridge, edexcel syllabus followed notes for undergraduate and postgraduate students