INTRO

Question 1

pervasive problem that affects almost every aspect of our lives, from the cars we
drive to the buildings we live in and the infrastructure we rely on

Answer 1

CORROSION

Question 2

natural process that involves the deterioration of a material as a result of chemical,
electrochemical or other reactions with its environment.

Answer 2

CORROSION

Question 3

Corrosion can occur on any material, including

Answer 3

metals, plastics, ceramics, and composites

Question 4

natural process of deterioration of materials through chemical or electrochemical
reactions with the environment.

Answer 4

Corrosion

Question 5

It is a complex process that involves the loss of material from a surface due to the interaction
with its surroundings, and it can occur in a variety of forms

Answer 5

Corrosion

Question 6

Corrosion of metals could also be considered as _________ in reverse

Answer 6

extractive metallurgy

Question 7

TYPES of CORROSION

Answer 7

Uniform
Galvanic
Pitting
Crevice
Stress corrosion cracking
Fretting
Erosion-corrosion

Question 8

This is the most common form of corrosion and occurs uniformly across the surface of a metal. It
is often caused by exposure to moisture, chemicals, or other corrosive agents

Answer 8

Uniform

Question 9

How to prevent uniform corrosion?

Answer 9

Use thicker materials for corrosion allowance
Use paints or metallic coatings such as plating, galvanizing or anodizing
Use Corrosion inhibitors or modifying the environment

Question 10

occurs when two different metals are in contact with each other and there is
an electrolyte (such as water) present. The more reactive metal (the anode) corrodes more
rapidly than the less reactive metal (the cathode

Answer 10

Galvanic

Question 11

Localized form of corrosion that creates small, deep holes or pits on the
surface of a metal. It is often caused by the presence of aggressive chemicals or localized differences in the
environment

Answer 11

Pitting

Question 12

occurs in confined spaces, such as gaps or crevices between metal
surfaces, where oxygen and other chemicals are limited.

Answer 12

Crevice

Question 13

Crevice corrosion is common in

Answer 13

seawater or other chloride-rich environments.

Question 14

occurs when a metal is exposed to a corrosive environment and is under
tensile stress.

Answer 14

Stress corrosion cracking

Question 15

The combination of stress and corrosion can lead to

Answer 15

cracking and failure of the metal.

Question 16

a type of corrosion that occurs at the interface between two surfaces that are
subjected to cyclic loading or vibration

Answer 16

fretting

Question 17

Fretting corrosion can cause damage to metal components, such as _________

Answer 17

bolts and bearings

Question 18

occurs when a metal surface is exposed to a corrosive environment and is also
subjected to mechanical erosion, such as from flowing liquids or particles. This combination can result in accelerated corrosion and damage to the metal.

Answer 18

Erosion corrosion

Question 19

Examples of erosion corrosion

Answer 19

Ship propellers
Hydraulic turbines
Pump impellers
Diesel engine cylinder

Question 20

One of the earliest recorded instances of
corrosion control comes from the ancient
____________, who used a technique called
“_____________” to coat metal objects with a
thin layer of gold or silver to protect them
from corrosion

Answer 20

Egyptians, electroplating

Question 21

The technique involved placing the metal
object in a solution of gold or silver salt
and then passing an electric current
through it to deposit a thin layer of the
precious metal onto the surface

Answer 21

Electroplating

Question 22

In the middle-ages blacksmiths and
metalworkers would coat__________ with a layer of wax, oil, or tar to prevent them from rusting.

Answer 22

iron and steel objects

Question 23

In middle ages, they used techniques like _________, which involved heating the
metal to a high temperature and
then quenching it in oil or water, to
create a thin layer of oxide on the
surface of the metal that would help
protect it from further corrosion

Answer 23

bluing

Question 24

saw significant advances in corrosion control, as engineers and
scientists began to study the mechanisms of corrosion and develop new materials and coatings to
protect against it.

Answer 24

Industrial Revolution

Question 25

The development of ___________l, for example, was a major breakthrough in corrosion-resistant materials, as it contained a high percentage of ____________, which formed a protective oxide layer
on the surface of the metal

Answer 25

stainless steel, chromium

Question 26

Corrosion has significant economic and safety implications, as it can cause damage to ________, as well as ___________

Answer 26

infrastructure, equipment, and other assets; pose risks to human health and safety

Question 27

Economic Implications of corrosion

Answer 27

Maintenance costs
Downtime
Energy consumption

Question 28

Corrosion can increase maintenance costs
by requiring frequent repairs or
replacements of affected components or
infrastructure.

Answer 28

Maintenance costs

Question 29

Corrosion-related failures can
cause unexpected downtime, which
can result in lost production,
decreased efficiency, and reduced
profitability for businesses.

Answer 29

Downtime

Question 30

▪ Corrosion can also increase energy
consumption, as it can cause friction and
resistance in moving parts, leading to
increased wear and tear on equipment and
higher energy usage.

Answer 30

Energy consumption

Question 31

Safety Implications

Answer 31

Structural integrity
Health risks
Fire hazards

Question 32

• Corrosion can compromise the
  structural integrity of infrastructure
  and equipment, leading to potential
  collapse or failure

Answer 32

Structural integrity

Question 33

Corrosion can also pose health
risks, especially if it affects systems
that handle water, chemicals, or
other hazardous materials

Answer 33

Health risks

Question 34

Corrosion can increase the risk of fires, especially in industrial settings where flammable materials
are present.

Answer 34

Fire hazards

Question 35

By implementing ____________, businesses and organizations
can reduce the risk of corrosion-related problems and protect their assets and the safety of their
employees and the public

Answer 35

regular inspections, maintenance, and upgrades