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Rust and Classification of Rust Print E-mail


Rust is scientifically called oxidation, which occurs when oxygen comes in long-term contact with certain metals. Over time, the oxygen combines with the metal at an atomic level, forming a new compound called an oxide and weakening the bonds of the metal itself. Rust consists of hydrated iron(III) oxides Fe2O3·nH2O, iron(III) oxide-hydroxide (FeO(OH), Fe(OH)3. Rusting is the common term for corrosion of iron and its alloys, such as steel. Other metals undergo equivalent corrosion, but the resulting oxides are not commonly called rust.

There are many different ways in which corrosion can begin and the degree to which a material or structure is attacked can vary widely. In general, the formation of rust and resultant loss of metal occurs in areas which retain moisture because (for example) of a build-up of road dirt and mud.

Rust corrosion can be in following three different stages.

 

Image of Car rust


Surface Rust
On the surface of a section of metal, light and powdery corrosion  is termed surface rust and is sometimes the first indication of corrosion that can be observed. It should warn to take steps for preventing the rust from spreading.

For example, Many older cars and vans suffer from damaging and unsightly rust. surface rust can occur on or behind any body panel of a vehicle particularly if the protective coating is scratched or damaged.

Advanced Rust
If Surface rust left unattended, it will develop into an advanced form of corrosion which can usually be seen as an eruption of oxidised metal, either on bare metal or under paint. This eruption occurs because the rust reaction involves an increase in volume so that pitting or bubbling of paint is the usual indication of penetration.

Extensive Rust
It is the final stage of the corrosion process, is the formation of heavy encrustation of oxidised metal which completely replace the parent metal. This results in a hole or series of holes in the body panel or structural member of the vehicle when the rust is removed. This category of rust can usually only be rectified by replacement of the affected body panels and parts.

 
 
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