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en.wikipedia.org/wiki/Rust

Although rusting is generally a negative aspect of iron, a particular form of rusting, known as "stable rust," causes the object to have a thin coating of rust over the top, and if kept in low relative humidity, makes the "stable" layer protective to the iron below, but not to the extent of other oxides, such as aluminum.

www.education.com/science-fair/article/iron-rusting

Rust, unlike iron, is crumbly, orange, and pretty much useless for building things. In this experiment, you’ll discover what kind of conditions help rust form or prevent it from forming at all, and why. Problem. What substances cause iron to rust? Materials. 4 small containers or jars with lids (make sure they are completely dry) Labels or tape

www.quora.com/What-causes-rust-to-form

"Rust is an iron oxide, usually red oxide formed by the redox reaction of iron and oxygen in the presence of water or air moisture. Several forms of rust are distinguishable both visually and by spectroscopy, and form under different circumstances. Rust consists of hydrated iron(III) oxides Fe2O3·nH2O and iron(III) oxide-hydroxide (FeO(OH), Fe ...

zippyfacts.com/what-causes-rust

What Causes Rust? By Karen Hill. The reddish-brown crust that often forms on iron and steel objects comes from changes that take place in the outer surface of the metal itself. This crust, called rust, is caused by the mixture of the metal with oxygen from water in the air.

www.reference.com/science/cause-iron-rust-3db28acdb079b3cc

Rust is caused when iron comes into direct contact with water and oxygen. Technically, rust comes from a chemical reaction between carbon dioxide from the air, water and the iron. Rusting is an oxidation reaction. The chemical component of rust is iron oxide. Its chemical formula is Fe2O3. Rust is nothing more than simply corroded iron.

www.familyhandyman.com/diy-advice/what-causes-rust

What Causes Rust to Form? You know rust because it wreaks havoc on your bike, shower curtain rod and iron patio furniture. But why? Let’s do some rust busting… We know that unsightly and often messy reddish- or yellowish-brown flaky coating on some of our favorite metal kitchen, garden and ...

sciencing.com/causes-nail-rust-8267344.html

Since one of the chemical reactions that causes rust requires the presence of water and the second reaction requires oxygen, rust can only form when both water and oxygen can reach the iron molecules in the nail.

education.seattlepi.com/chemicals-rust-metal-rapidly-4952.html

Where metal is covered in water, iron atoms lose electrons, which causes the metal to slowly disintegrate; ionized iron dissolves into the water. In the water, the dissolved iron reacts with the hydroxide ions to form rust. Salt. Salt accelerates the rusting process by lowering the electrical resistance of water. Rust happens through a chemical ...

auto.howstuffworks.com/.../prevent-automotive-rust1.htm

Because rust only needs an anode, cathode and electrolyte to form, cars are susceptible to it. The metal in your car can act as the anode and cathode. Water is an electrolyte. If the climate is humid enough, your car can develop rust even if it's under cover. Some substances make it easier for rust to form on your car. One of the most common is ...

www.reference.com/science/rust-form-b568f0246d0a2889

Rust forms on iron due to an oxidation reaction that occurs when it comes into contact with oxygen and water. The reaction of iron, oxygen and water forms hydrated iron(III) oxide, which is known as rust. Acid rain or saltwater can cause iron to rust more quickly.