Lesson 1 Flashcards
Corrosion is a natural process that involves the ___ as a result of chemical, electrochemical or other reactions with its environment.
deterioration of a material
Corrosion can occur on any material, including ___
metals, plastics, ceramics, and composites.
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.
Corrosion
Corrosion of metals could also be considered as ___
extractive metallurgy in reverse.
Types of corrosion
Uniform
Galvanic
Pitting
Crevice
Stress corrosion cracking
Fretting
Erosion-corrosion
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.
Uniform corrosion
Uniform corrosion or ____
general corrosion
Uniform corrosion can be prevented through a number of methods:
Use thicker materials for corrosion allowance
Use paints or metallic coatings such as plating, galvanizing or anodizing
Use Corrosion inhibitors or modifying the environment
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).
Galvanic corrosion
___ 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
Pitting corrosion
It is often caused by the presence of aggressive chemicals or localized differences in the environment
Pitting corrosion
It is often caused by exposure to moisture, chemicals, or other corrosive agents.
Uniform corrosion
___occurs in confined spaces, such as gaps or crevices between metal surfaces, where ____ and other chemicals are limited.
Crevice corrosion
oxygen
Primary source of leaks in water handling systems
Corrosion pits
___ occurs when a metal is exposed to a corrosive environment and is under tensile stress.
Stress corrosion cracking
The combination of ___ can lead to cracking and failure of the metal.
stress and corrosion
____ is a type of corrosion that occurs at the interface between two surfaces that are subjected to cyclic loading or vibration.
Fretting corrosion
It can cause damage to metal components, such as bolts or bearings, and lead to failure
Fretting corrosion
___ occurs when a metal surface is exposed to a corrosive environment and is also subjected to mechanical erosion, such as from ___
Erosion-corrosion
–flowing liquids or particles.
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
Electroplating
___, the gradual destruction of materials by chemical or electrochemical reaction with their environment, has been a problem for human civilizations throughout history.
Corrosion
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.
Iron Age
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.
electroplating
In the middle-ages blacksmiths and metalworkers would coat iron and steel objects with a layer of ___ to prevent them from rusting.
wax, oil, or tar
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.
bluing
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
Stainless steel
Chromium
Katana signed by ___, considered Japan’s greatest swordsmith from the Kamakura period, 14th century
Masamune
Corrosion can increase ___ by requiring frequent repairs or replacements of affected components or infrastructure.
maintenance costs
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.
energy consumption
Corrosion can compromise the ___ of infrastructure and equipment, leading to potential collapse or failure.
structural integrity
Corrosion failures can cause ____, which can result in lost production, decreased efficiency, and reduced profitability for businesses.
unexpected downtime
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.
regular inspections, maintenance, and upgrades
Corrosion caused by contact between two dissimilar metals in the presence of an electrolyte
Galvanic
Metals most resistant to corrosion
Titanium
