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Introduction to Corrosion - PowerPoint Presentation, Mechanical Engineering Mechanical Engineering Notes | EduRev

Mechanical Engineering : Introduction to Corrosion - PowerPoint Presentation, Mechanical Engineering Mechanical Engineering Notes | EduRev

 Page 1


DAY 36: INTRODUCTION TO 
CORROSION 
? Importance of Corrosion 
? What is Corrosion?  Some theory. 
? The four things that are required for corrosion 
? Types of Corrosion 
 
 
 
Page 2


DAY 36: INTRODUCTION TO 
CORROSION 
? Importance of Corrosion 
? What is Corrosion?  Some theory. 
? The four things that are required for corrosion 
? Types of Corrosion 
 
 
 
ENVIRONMENTAL DEGRADATION OF 
MATERIALS 
? Materials are “attacked” by their operating 
environment. 
? We will focus on the degradation of metals.  This 
is called corrosion. 
? Some attention will be paid to polymers, but none 
to ceramics. 
 
? In metals, corrosion is produced by the loss of 
actual material, which leaves the piece as an ion 
in solution, and is carried away by an electrolyte. 
? Rust is a symptom of this problem in steel, but 
there can be corrosion without it. 
Page 3


DAY 36: INTRODUCTION TO 
CORROSION 
? Importance of Corrosion 
? What is Corrosion?  Some theory. 
? The four things that are required for corrosion 
? Types of Corrosion 
 
 
 
ENVIRONMENTAL DEGRADATION OF 
MATERIALS 
? Materials are “attacked” by their operating 
environment. 
? We will focus on the degradation of metals.  This 
is called corrosion. 
? Some attention will be paid to polymers, but none 
to ceramics. 
 
? In metals, corrosion is produced by the loss of 
actual material, which leaves the piece as an ion 
in solution, and is carried away by an electrolyte. 
? Rust is a symptom of this problem in steel, but 
there can be corrosion without it. 
IMPORTANCE OF CORROSION 
? The impact of corrosion on society is very 
significant. 
From NACE: 
 
Direct Costs of 
Corrosion: 
Nearly 300 G$ in 1998.  
Clearly, they rise 
proportionally till today. 
Between 3-5% of the 
Gross Domestic Product. 
Page 4


DAY 36: INTRODUCTION TO 
CORROSION 
? Importance of Corrosion 
? What is Corrosion?  Some theory. 
? The four things that are required for corrosion 
? Types of Corrosion 
 
 
 
ENVIRONMENTAL DEGRADATION OF 
MATERIALS 
? Materials are “attacked” by their operating 
environment. 
? We will focus on the degradation of metals.  This 
is called corrosion. 
? Some attention will be paid to polymers, but none 
to ceramics. 
 
? In metals, corrosion is produced by the loss of 
actual material, which leaves the piece as an ion 
in solution, and is carried away by an electrolyte. 
? Rust is a symptom of this problem in steel, but 
there can be corrosion without it. 
IMPORTANCE OF CORROSION 
? The impact of corrosion on society is very 
significant. 
From NACE: 
 
Direct Costs of 
Corrosion: 
Nearly 300 G$ in 1998.  
Clearly, they rise 
proportionally till today. 
Between 3-5% of the 
Gross Domestic Product. 
WHEN PROTECTIVE COATINGS BREAK 
DOWN, THINGS CAN GET UGLY. 
From Corrosion 
Doctors web 
site 
This obvious, up front relatively uniform corrosion is relatively benign.  
We see it for a long time before it hurts us.  Not all corrosion is so 
nice. 
Page 5


DAY 36: INTRODUCTION TO 
CORROSION 
? Importance of Corrosion 
? What is Corrosion?  Some theory. 
? The four things that are required for corrosion 
? Types of Corrosion 
 
 
 
ENVIRONMENTAL DEGRADATION OF 
MATERIALS 
? Materials are “attacked” by their operating 
environment. 
? We will focus on the degradation of metals.  This 
is called corrosion. 
? Some attention will be paid to polymers, but none 
to ceramics. 
 
? In metals, corrosion is produced by the loss of 
actual material, which leaves the piece as an ion 
in solution, and is carried away by an electrolyte. 
? Rust is a symptom of this problem in steel, but 
there can be corrosion without it. 
IMPORTANCE OF CORROSION 
? The impact of corrosion on society is very 
significant. 
From NACE: 
 
Direct Costs of 
Corrosion: 
Nearly 300 G$ in 1998.  
Clearly, they rise 
proportionally till today. 
Between 3-5% of the 
Gross Domestic Product. 
WHEN PROTECTIVE COATINGS BREAK 
DOWN, THINGS CAN GET UGLY. 
From Corrosion 
Doctors web 
site 
This obvious, up front relatively uniform corrosion is relatively benign.  
We see it for a long time before it hurts us.  Not all corrosion is so 
nice. 
CORROSION DISASTER 
Atlantic Southeast 529, 8-21-1995 
Lead wool added for 
balancing 
Cork stopper

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Mohit Dhiman

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