Corrosion of Metals

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Re: Corrosion of Metals

Post by Aneesh Yadav on Thu Sep 10, 2015 5:52 am

Hey Guys!! Its informative and helpful also!!Cool Cool

Corrosion is the deterioration of a metal as a result of chemical reactions between it and the surrounding environment.

Both the type of metal and the environmental conditions, particularly what gases that are in contact with the metal, determine the form and rate of deterioration.

Types of Corrosion

The most common example of corrosion is, of course, rust. The reddish-brown compound referred to as rust is actually iron oxide (Fe2O3), a result of reactions between oxygen and iron.

But the oxidization of iron is just one example of corrosion. Corrosion can take many forms, which are classified depending on the environmental causes. More...

Corrosion Prevention

The World Corrosion Organization estimates the global cost of corrosion to be roughly US$ 2.2 trillion annually, and that a large portion of this - as much as 25% - could be eliminated by applying simple, well-understood prevention techniques.

Corrosion prevention should not, however, be considered solely a financial issue, but also one of health and safety, as evidenced by the 1967 collapse of Silver Bridge.

An effective prevention system begins in the design stage with a proper understanding of the environmental conditions and metal properties. Cool Twisted Evil Twisted Evil What a Face cyclops
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Re: Corrosion of Metals

Post by imanshul on Wed Sep 09, 2015 9:06 pm

Corrosion is a natural process, which converts refined metal to their more stable oxide. It is the gradual destruction of materials (usually metals) by chemical reaction with their environment.

Galvanic corrosion occurs when two different metals have physical or electrical contact with each other and are immersed in a common electrolyte, or when the same metal is exposed to electrolyte with different concentrations. 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. When immersed separately, each metal corrodes at its own rate. What type of metal(s) to use is readily determined by following the galvanic series

Galvanic series
Main article: Galvanic series
In any given environment (one standard medium is aerated, room-temperature seawater), one metal will be either more noble or more active than others, based on how strongly its ions are bound to the surface.
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Re: Corrosion of Metals

Post by VK KUMAR on Wed Sep 09, 2015 8:13 pm

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Corrosion is a natural process, which converts refined metal to their more stable oxide. It is the gradual destruction of materials (usually metals) by chemical reaction with their environment.

In the most common use of the word, this means electrochemical oxidation of metal in reaction with an oxidant such as oxygen. Rusting, the formation of iron oxides, is a well-known example of electrochemical corrosion. This type of damage typically produces oxide(s) or salt(s) of the original metal, and results in a distinctive orange colouration. Corrosion can also occur in materials other than metals, such as ceramics or polymers, although in this context, the term degradation is more common. Corrosion degrades the useful properties of materials and structures including strength, appearance and permeability to liquids and gases.

Many structural alloys corrode merely from exposure to moisture in air, but the process can be strongly affected by exposure to certain substances. Corrosion can be concentrated locally to form a pit or crack, or it can extend across a wide area more or less uniformly corroding the surface. Because corrosion is a diffusion-controlled process, it occurs on exposed surfaces. As a result, methods to reduce the activity of the exposed surface, such as preservation and chromate conversion, can increase a material's corrosion resistance. However, some corrosion mechanisms are less visible and less predictable.


Last edited by VK KUMAR on Wed Sep 09, 2015 9:15 pm; edited 1 time in total
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Re: Corrosion of Metals

Post by VK KUMAR on Wed Sep 09, 2015 8:08 pm

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Re: Corrosion of Metals

Post by VK KUMAR on Wed Sep 09, 2015 8:00 pm

HEY THERE AN INTERESTING VIDEO ON CORROSION OF METALS !!! Twisted Evil Twisted Evil Twisted Evil Twisted Evil


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Re: Corrosion of Metals

Post by Aneesh Yadav on Wed Sep 09, 2015 7:24 pm

Its interesting!!Cool Cool Razz

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Re: Corrosion of Metals

Post by Dishita Kaushik on Wed Sep 09, 2015 7:17 pm

Very informative. ..Thanks for the post
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Re: Corrosion of Metals

Post by Aneesh Yadav on Wed Sep 09, 2015 7:06 pm


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Re: Corrosion of Metals

Post by KIRTI on Wed Sep 09, 2015 7:03 pm

Corrosion can be prevented if the contact between air and metal is cut off.There are number of ways by which we can prevent it :

Corrosion can be prevented if the metal is coated with something which does not allow moisture and oxygen to react with it.
Coating of metals with paint, oil, grease or varnish prevents the corrosion of metals.
Coating of corrosive metals with non-corrosive metals also prevents corrosion. Some of the methods by which metals can be coated with non-corrosive metals are:
Galvanizing: It is process of giving a thin coating of zinc on iron or steel to protect them from corrosion. Iron is galvanized by dipping it in molten zinc. It is then taken out and allowed to cool. Galvanizing is an effective methods of protecting steel because even if the surface is scratched, the zinc still protects the underlying layer.
Tinning: It is the process of giving a coating of tin, i.e., molten tin. Cooking vessels, made of copper and brass get a greenish coating due to corrosion. This greenish coating is poisonous. Therefore they are given a coating of tin to prevent corrosion.
Electroplating: In this method of a metal is covered with another metal using electrolysis. Silver-plated spoons, gold-plated jewelry, etc, are electroplated.
Anodizing: In this method metals like copper and aluminum are electrically coated with a thin strong film of their oxides. This film protects the metals from corrosion.
Alloying: Corrosion can be also prevented by alloying some metals with other metals. The resultant metals called alloys do not corrode easily, e.g. stainless steel.
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Re: Corrosion of Metals

Post by KIRTI on Wed Sep 09, 2015 7:02 pm

Corrosion can be prevented if the contact between air and metal is cut off.There are number of ways by which we can prevent it :

Corrosion can be prevented if the metal is coated with something which does not allow moisture and oxygen to react with it.
Coating of metals with paint, oil, grease or varnish prevents the corrosion of metals.
Coating of corrosive metals with non-corrosive metals also prevents corrosion. Some of the methods by which metals can be coated with non-corrosive metals are:
Galvanizing: It is process of giving a thin coating of zinc on iron or steel to protect them from corrosion. Iron is galvanized by dipping it in molten zinc. It is then taken out and allowed to cool. Galvanizing is an effective methods of protecting steel because even if the surface is scratched, the zinc still protects the underlying layer.
Tinning: It is the process of giving a coating of tin, i.e., molten tin. Cooking vessels, made of copper and brass get a greenish coating due to corrosion. This greenish coating is poisonous. Therefore they are given a coating of tin to prevent corrosion.
Electroplating: In this method of a metal is covered with another metal using electrolysis. Silver-plated spoons, gold-plated jewelry, etc, are electroplated.
Anodizing: In this method metals like copper and aluminum are electrically coated with a thin strong film of their oxides. This film protects the metals from corrosion.
Alloying: Corrosion can be also prevented by alloying some metals with other metals. The resultant metals called alloys do not corrode easily, e.g. stainless steel.
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Re: Corrosion of Metals

Post by Aneesh Yadav on Wed Sep 09, 2015 6:57 pm

Hey! I've an interesting explanations about corrosion of metals.!! Twisted Evil Twisted Evil Cool Cool



Corrosion is a natural process, which converts refined metal to their more stable oxide. It is the gradual destruction of materials (usually metals) by chemical reaction with their environment. In the most common use of the word, this means electrochemical oxidation of metal in reaction with an oxidant such as oxygen. Twisted Evil Razz What a Face
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Re: Corrosion of Metals

Post by KIRTI on Wed Sep 09, 2015 6:52 pm

Image result for what is corrosion of metals
Corrosion is a natural process, which converts refined metal to their more stable oxide. It is the gradual destruction of materials (usually metals) by chemical reaction with their environment. In the most common use of the word, this means electrochemical oxidation of metal in reaction with an oxidant such as oxygen.
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Corrosion of Metals

Post by DAV Science Teacher on Wed Sep 09, 2015 4:42 pm

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Re: Corrosion of Metals

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