Lesson 1

Question 1

Corrosion is a natural process that involves the ___ as a result of chemical, electrochemical or other reactions with its environment.

Answer 1

deterioration of a material

Question 2

Corrosion can occur on any material, including ___

Answer 2

metals, plastics, ceramics, and composites.

Question 3

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 3

Corrosion

Question 4

Corrosion of metals could also be considered as ___

Answer 4

extractive metallurgy in reverse.

Question 5

Types of corrosion

Answer 5

Uniform
Galvanic
Pitting
Crevice
Stress corrosion cracking
Fretting
Erosion-corrosion

Question 6

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 6

Uniform corrosion

Question 7

Uniform corrosion or ____

Answer 7

general corrosion

Question 8

Uniform corrosion can be prevented through a number of methods:

Answer 8

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 9

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 9

Galvanic corrosion

Question 10

___ is a 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 10

Pitting corrosion

Question 11

It is often caused by the presence of aggressive chemicals or localized differences in the environment

Answer 11

Pitting corrosion

Question 12

It is often caused by exposure to moisture, chemicals, or other corrosive agents.

Answer 12

Uniform corrosion

Question 13

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

Answer 13

Crevice corrosion
oxygen

Question 14

Primary source of leaks in water handling systems

Answer 14

Corrosion pits

Question 15

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

Answer 15

Stress corrosion cracking

Question 16

The combination of ___ can lead to cracking and failure of the metal.

Answer 16

stress and corrosion

Question 17

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

Answer 17

Fretting corrosion

Question 18

It can cause damage to metal components, such as bolts or bearings, and lead to failure

Answer 18

Fretting corrosion

Question 19

___ occurs when a metal surface is exposed to a corrosive environment and is also subjected to mechanical erosion, such as from ___

Answer 19

Erosion-corrosion
–flowing liquids or particles.

Question 20

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 20

Electroplating

Question 21

___, the gradual destruction of materials by chemical or electrochemical reaction with their environment, has been a problem for human civilizations throughout history.

Answer 21

Corrosion

Question 22

The effects of corrosion can be seen in ancient artifacts and structures, such as the rusted iron nails and fittings of the ____ or the corroded bronze statues of the ancient Greeks and Romans.

Answer 22

Iron Age

Question 23

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

Answer 23

electroplating

Question 24

In the middle-ages blacksmiths and metalworkers would coat iron and steel objects with a layer of ___ to prevent them from rusting.

Answer 24

wax, oil, or tar

Question 25

They also 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 25

bluing

Question 26

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 26

Stainless steel
Chromium

Question 27

Katana signed by ___, considered Japan’s greatest swordsmith from the Kamakura period, 14th century

Answer 27

Masamune

Question 28

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

Answer 28

maintenance costs

Question 29

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

Answer 29

energy consumption

Question 30

Corrosion can compromise the ___ of infrastructure and equipment, leading to potential collapse or failure.

Answer 30

structural integrity

Question 31

Corrosion failures can cause ____, which can result in lost production, decreased efficiency, and reduced profitability for businesses.

Answer 31

unexpected downtime

Question 32

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 32

regular inspections, maintenance, and upgrades

Question 33

Corrosion caused by contact between two dissimilar metals in the presence of an electrolyte

Answer 33

Galvanic

Question 34

Metals most resistant to corrosion

Answer 34

Titanium