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Bosch MIC400 Aluminum Camera – Why aluminium is rust resistance?

MONday - 30/05/2011 20:50
Bosch MIC400 Aluminum Camera – Why aluminium is rust resistance?
ust is a general term for describing iron oxides. In colloquial usage, the term is applied to red oxides, formed by the reaction of iron and oxygen in the presence of water or air moisture

What is Rust

“Rust is a general term for describing iron oxides.  In colloquial usage, the term is applied to red oxides, formed by the reaction of iron and oxygen in the presence of water or air moisture.” (quote from Wikipedia)

A more scientific term for the gradual destruction of a metal by oxidation is called corrodes. 

When iron rusts, its color changes and it actually expands.  This expansion and color change will produce large red flakes commonly known as rust.  These flakes will falls off the metal and expose “fresh” metal to the elements and the process starts all over again.  Given sufficient time, oxygen and water, the metal will eventually reduce to “rust”.

Why Stainless steel does not rust

It is a common known fact that stainless steel does not rust, but it does corrodes.  However, it does not form those red flakes that iron does because stainless steel contains chromium.  When stainless steel is exposed to the elements, the chromium “rusts” first.  Unlike iron, chromium doesn’t form flakes and crumble apart.  Instead it forms an invisible thin layer that protects the steel underneath it.

Why Aluminum does not rust

Aluminum corrodes, but it’s process is similar to stainless steel.  It does not form rust, but it does oxidize and forms aluminum oxide.  The result is a “skin” of aluminum oxide coating on top of the aluminum.  Aluminum oxide is highly resistant to corrosion.

What is MIC440 made up of?

MIC 440’s housing is machined from solid aluminum; henceforth it inherits the good property of aluminum resistance against rusting. Next it receives a coating of Alchrome 1200.  Alchrome 1200 is a chromate based substance used in aerospace and defense industries.  It provides a protective layer that significantly improves corrosion resistance.  Finally, a robust polyester power coat paint is applied.  This electro statically applied paint has excellent adhesion, weather resistance and UV fading resistant properties.  These two processes improve the MIC440’s ability to resist corrosion, making the MIC440 suitable for operation in sea port or similar environments having high salt content.


Stainless Steel PTZ vs Aluminum MIC

Stainless steel has its advantage as well as disadvantage; the most obvious advantage of a stainless steel housing is the strength of the metal.  There is no doubt stainless steel is a much tougher metal compare with aluminum, but that also depends on the thickness of the stainless steel used to make the housing.  Assuming thickness of material is the same, this advantage is still subjective; it really depends on the usage of the product.  Most CCTV applications do not subject the housing to “brutal” force.  They are usually installed in locations not easily accessible.

If vandalism is a concern, MIC440 is machined from solid aluminum making it a tough camera capable of withstanding vandalism.  In additional, the small foot print of the MIC440 and “roundness” design of the housing allows it to deflate the impact of objects thrown at it better than a tube style housing mounted on a Pan/Tilt unit.  The design of the MIC440 housing is also able to handle a higher wind load compare to a conventional PTZ with a tube style housing.

Because the MIC440 has a double layer of protection against the elements, its aluminum construction is actually just as rust resistant as stainless steel.

One of the least noticed advantage of MIC440 is its small foot print and weight. Because it is made of aluminum, it is a lot less heavy than a stainless steel PTZ.  This makes installation and maintenance a lot easier. The size of MIC440 is much smaller but yet provides similar zoom ratio as compare to competition.  In addition, its light weight allows it to be pan and tilted at higher speeds, providing enhanced performance compared to heavier cameras.


Source: AIC Group

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