Corrosion

corrosion resistancecorrodecorrosivecorrosion-resistantcorrodedcorrodingcorrosivitycorrodeschemical durabilitycorrosion resistant
Corrosion is a natural process, which converts a refined metal to a more chemically-stable form, such as its oxide, hydroxide, or sulfide.wikipedia
1,123 Related Articles

Oxide

oxidesmetal oxideO
Corrosion is a natural process, which converts a refined metal to a more chemically-stable form, such as its oxide, hydroxide, or sulfide.
For example, aluminium foil develops a thin skin of Al 2 O 3 (called a passivation layer) that protects the foil from further corrosion.

Passivation (chemistry)

passivationpassivatingpassivation layer
As a result, methods to reduce the activity of the exposed surface, such as passivation and chromate conversion, can increase a material's corrosion resistance.
As a technique, passivation is the use of a light coat of a protective material, such as metal oxide, to create a shell against corrosion.

Rust

rustingferruginouscorrosion
Rusting, the formation of iron oxides, is a well-known example of electrochemical corrosion.
Rusting is the common term for corrosion of iron and its alloys, such as steel.

Oxygen

OO 2 molecular oxygen
In the most common use of the word, this means electrochemical oxidation of metal in reaction with an oxidant such as oxygen or sulfates.
This may have been in part due to the prevalence of the philosophy of combustion and corrosion called the phlogiston theory, which was then the favored explanation of those processes.

Corrosion engineering

corrosioncorrosion engineerscorrosion scientist and engineer
Corrosion engineering is the field dedicated to controlling and stopping corrosion.
Corrosion engineering groups have formed around the world in order to help educate and prevent, slow and manage the effects of corrosion.

Noble metal

noble metalsnoblenoble-metal
In a galvanic couple, the more active metal (the anode) corrodes at an accelerated rate and the more noble metal (the cathode) corrodes at a slower rate.
In chemistry, the noble metals are metals that are resistant to corrosion and oxidation in moist air (unlike most base metals).

Alloy

alloysmetal alloyalloying
Many structural alloys corrode merely from exposure to moisture in air, but the process can be strongly affected by exposure to certain substances.
By adding chromium to steel, its resistance to corrosion can be enhanced, creating stainless steel, while adding silicon will alter its electrical characteristics, producing silicon steel.

Galvanic anode

sacrificial anodesacrificial anodessacrificial zinc
Galvanic corrosion is often prevented by the use of sacrificial anodes.
A galvanic anode is the main component of a galvanic cathodic protection (CP) system used to protect buried or submerged metal structures from corrosion.

Metal

metalsmetal ionsmetal ion
It is the gradual destruction of materials (usually metals) by chemical and/or electrochemical reaction with their environment.
Painting, anodizing or plating metals are good ways to prevent their corrosion.

Titanium

Tititanium oretitanian
Passivation in natural environments such as air, water and soil at moderate pH is seen in such materials as aluminium, stainless steel, titanium, and silicon.
Titanium is resistant to corrosion in sea water, aqua regia, and chlorine.

Platinum

Ptcompounds of platinumdouble Platinum
Any corrosion products of gold or platinum tend to decompose spontaneously into pure metal, which is why these elements can be found in metallic form on Earth and have long been valued.
It has remarkable resistance to corrosion, even at high temperatures, and is therefore considered a noble metal.

Anti-corrosion

anti corrosionanti-corrosiveoxidation
There are various ways of protecting metals from corrosion (oxidation) including painting, hot dip galvanizing, and combinations of these.
Anti-corrosion refers to the protection of metal surfaces from corroding in high-risk (corrosive) environments.

Zinc

ZnZn 2+ zinc alloy
These include such metals as zinc, magnesium, and cadmium.
Corrosion-resistant zinc plating of iron (hot-dip galvanizing) is the major application for zinc.

Aluminium

aluminumAlall-metal
Passivation in natural environments such as air, water and soil at moderate pH is seen in such materials as aluminium, stainless steel, titanium, and silicon.
Aluminium is remarkable for its low density and its ability to resist corrosion through the phenomenon of passivation.

Stainless steel

stainless-steelstainlessstainless steels
Passivation in natural environments such as air, water and soil at moderate pH is seen in such materials as aluminium, stainless steel, titanium, and silicon.
Stainless steels are most notable for their corrosion resistance, which increases with increasing chromium content.

Erosion

erodederodingerode
Corrosion is a natural process, which converts a refined metal to a more chemically-stable form, such as its oxide, hydroxide, or sulfide.
It is the most effective and rapid form of shoreline erosion (not to be confused with corrosion). Corrosion is the dissolving of rock by carbonic acid in sea water.

Cadmium

CdCd 2+ ca'''dmium
These include such metals as zinc, magnesium, and cadmium.
Unlike most other metals, cadmium is resistant to corrosion and is used as a protective plate on other metals.

Hot-dip galvanization

galvanized steelhot-dip galvanizinggalvanised steel
There are various ways of protecting metals from corrosion (oxidation) including painting, hot dip galvanizing, and combinations of these.
It is the process of coating iron and steel with zinc, which alloys with the surface of the base metal when immersing the metal in a bath of molten zinc at a temperature of around 840 F. When exposed to the atmosphere, the pure zinc (Zn) reacts with oxygen (O 2 ) to form zinc oxide (ZnO), which further reacts with carbon dioxide (CO 2 ) to form zinc carbonate (ZnCO 3 ), a usually dull grey, fairly strong material that protects the steel underneath from further corrosion in many circumstances.

Stress corrosion cracking

stress corrosionstress-corrosion crackingenvironmentally-assisted cracking
If breakdown occurs in the passive film due to chemical or mechanical factors, the resulting major modes of corrosion may include pitting corrosion, crevice corrosion, and stress corrosion cracking.
Stress corrosion cracking (SCC) is the growth of crack formation in a corrosive environment.

Pitting corrosion

pittingcorrosion pittingcorrosion
If breakdown occurs in the passive film due to chemical or mechanical factors, the resulting major modes of corrosion may include pitting corrosion, crevice corrosion, and stress corrosion cracking.
Pitting corrosion, or pitting, is a form of extremely localized corrosion that leads to the creation of small holes in the metal.

Crevice corrosion

crevicecrevicesfiliform
If breakdown occurs in the passive film due to chemical or mechanical factors, the resulting major modes of corrosion may include pitting corrosion, crevice corrosion, and stress corrosion cracking.
Crevice corrosion refers to corrosion occurring in confined spaces to which the access of the working fluid from the environment is limited.

Chromium

Crchromechromium(III)
Stainless steel can pose special corrosion challenges, since its passivating behavior relies on the presence of a major alloying component (chromium, at least 11.5%).
Chromium metal is of high value for its high corrosion resistance and hardness.

Rebar

reinforcing steelrebarsreinforcing bar
On the other hand, unusual conditions may result in passivation of materials that are normally unprotected, as the alkaline environment of concrete does for steel rebar.
The cast iron used for the rebar was of high quality, and there is no corrosion on the bars to this day.

Magnesium

MgMg 2+ magnesian
These include such metals as zinc, magnesium, and cadmium.
The presence of iron, nickel, copper, and cobalt strongly activates corrosion.

Microbial corrosion

microbially induced corrosionAcidithiobacillus ferrooxidanscorrosive
Microbial corrosion, or commonly known as microbiologically influenced corrosion (MIC), is a corrosion caused or promoted by microorganisms, usually chemoautotrophs.
Microbial corrosion, also called bacterial corrosion, bio-corrosion, microbiologically influenced corrosion, or microbially induced corrosion (MIC), is corrosion caused or promoted by microorganisms, usually chemoautotrophs.