Saturday, 18 January 2014
Rusting is the formation of hydrated iron (III) hydroxide from iron, in the presence of oxygen and water.
Thus, the conditions required for rusting are:
- oxygen (or air)
Ways to prevent rusting
1. Painting/ greasing
2. Coating iron with a less reactive metal (e.g tin). However, once this layer is scratched, iron is exposed and will rust readily.
3. Sacrificial protection method (using e.g. magnesium and zinc). These more reactive metal will react in place of iron, thus protecting iron. The disadvantage is that once these more reactive metals have been used up, they need to be replace.
4. Forming alloys such as stainless steel
By Emily at January 18, 2014
Test for aqueous cations If you would like to find out how a method to memorize the cation table, click here . Cations Effect...
When we are studying, not many of us actually have the time to come up creative ways for memorizing. One creative way which is to use acro...
You will need to know how to determine the electronic configuration, before using the method described below, to draw the dot- and- cross di...