why stone doesn't rusts?
348133
Some rocks contain iron. When exposed to water it will oxidize & become iron oxide.\n\nSome sedimentary rocks are cemented together w/ rusty orange substance which is iron oxide.\n\nI know, I just handled some of it today in class. It got all over my hands.\n\n;)
123326
Most corrosion is on the outside so it really doesn't make a difference, hot or cold. What determines corrosion is the \nenvironment outside of the pipe.
407613
because of its low or no corrosion and high shine
1155855
Possibly the material underneath the stainless is corroding and the rust found a way through. It's not necessarily solid stainless steel.
679627
The more surface area is open to the air, or oxygen, the faster it rusts.  That's why a sheet, which is pretty much totally exposed, will rust fast, but not thick parts like the engine, etc.  Rust, after all, is the product of Iron mixing with Oxygen.  Also, steel is a mixture, more specifically a metal alloy, of iron with carbon.  Alloys with higher carbon content than this are known as cast iron.  Therefore, cast iron rusts slower than sheet metal also because it contains a lot of carbon, rather than being all iron.  I don't know what is better for the garden, but "cast iron" is actually steel, with high amounts of carbon in it.
890588
Ferrous metals (iron/steel) rust and non-ferrous (aluminum/copper) metals oxidize.\nBoth are chemical reactions and effects of oxygen and moisture present in the atmosphere.\nBTW, ferrous metals are magnetic, non-ferrous metals aren't. Try it.
607505
Aluminum DOES rust; it just isn't like iron rust. Aluminum oxide (chemical formula Al2O3) forms a thin film on the outside of the aluminum. \n\nSome people say, figuratively, that we have never really seen aluminum, because the oxide coating forms so quickly; (I have to disagree with what someone else wrote above) you can't scratch aluminum and then see the true color before the oxide covers it.\n\nAl2O3 is chemically the same as sapphire, it is very hard and strong. Once the coating has formed on the surface, it protects the rest of the aluminum in the bulk of the piece, so it doesnt corrode away. The coating is very thin, though-- only one molecule thick-- so we don't notice it and it doesn't really add any structural strength to the aluminum. \n\nBy contrast, iron rust is very weak. It crumbles and falls apart very easily; it can't even support its own weight. So it breaks off the surface of the iron and leaves fresh iron exposed to rust. That is why bridges and girders fall alart if they are not painted or protected from the elements. But aluminum protects itself.
812124
1) Depends on environmental conditions\n2) Oxidation of iron--- 2Fe + 3O2---> 2Fe2O3\n3) Not easily.  To remove rust, phosphoric acid (naval jelly) is good\n4) Ultimate weapon: Cadmium plate, epoxy primer, epoxy finish coating.
531919
errrrrrr Oxygen, hence rusting is stricly called oxidisation.  But perhaps you should inform your questioner that Water is actually made up of Hydrogen and Oxygen, therefore some of the answers are obsolete.\n\nThink about the fact that metalwork inside a waterproofed building goes rusty as well as that outside.
61979
Real rust is oxidized iron and so it can only be one color.
125056
It does rust.  Due to the form it takes, it takes on oxygen molecules, carrying them with the iron for a time until it is released farther into the body.  If your blood's iron was blocked from combining with oxygen, what we call "rusting", you would die from lack of oxygen.
476743
Rust is made of Iron (III) Oxide, not pure iron.  As for its crystal structure, I'm not completely sure.
410825
Others have had similar problems and solved them.  See the link.  In general, metals (especially iron and its alloys) rust when exposed to moisture in the presence of oxygen.  The rust is a loose collection of molecules that allow more moisture and oxygen to reach the base metal.  For example, you can shine aluminum but it will quickly dull with oxidation.  The aluminum corrosion however forms a tenacious film that protect the metal from additional corrosion.  I heard that copper (flashing?) on a rooftop can cause aluminum gutters to corode.  Various alloys of iron (steel) including heat treatments may impart various corrosion properties, however, chrome is usually added to form stainless steels that best resists rusting.  Silicon steel may have to be protected.  Good luck.
521265
All metals do not "corrode."  Some metals oxidize, such as iron turning to rust and silver turning black.\nSome metals do not oxidize, such as gold and platinum.\nNo health care professional would put a metal into your body if it rusted, corroded, or deteriorated in some other way.  The fact that the rods are 30 years old should be proof that your rods are not corroding.\nYour doctor should be the one to explain the term "hot."
472017
Rust is an oxygenation reaction- \nBleach is a strong oxidizing agent, and thus will cause rust\nPowder bleach won't do anything in the absence of at least some water, because there is no medium for the reaction to occure\nAbsolutely pure water without dissolved oxygen will not speed rust, but it always has dissoved oxygen, and thus acts as a faster medium than air to speed rust\nMineral lime in water is a fast ruster\nVinegar is a reducing agent, and will prevent rust, but it'll eat the iron away.
373303
Pennies can't rust.  The chemical composition isn't right.  Rust is Ferric oxide and ferric is iron.  A penny contains, primarily, copper.
71181
to prevent rust/oxidation