Rust Removal

Just in case you have some oxidizedmetal and you want to get rid of it just watch this video.


Rust Removal Tip - video powered by Metacafe

Once rust is gone, you can use the remaining hydrogen to run your fancy Hydrogen fueled car.
But, just in case you wondered about the efficiency of creating hydrogen while removing that rust from your car parts: Water electrolysis does not convert 100% of the electrical energy into the chemical energy of hydrogen. The process requires more extreme potentials than what would be expected based on the cell's total reversible reduction potentials. This excess potential accounts for various forms of overpotential by which the extra energy is eventually lost as heat. For a well designed cell the largest overpotential is the reaction overpotential for the four electron oxidation of water to oxygen at the anode. An effective electrocatalyst to facilitate this reaction has not been developed. Platinum alloys are the default state of the art for this oxidation. The reverse reaction, the reduction of oxygen to water, is responsible for the greatest loss of efficiency in fuel cells. Developing a cheap effective electrocatalyst for this reaction would be a great advance.
Note:See wikipedia.
So, uh, I guess you should stick to just rust removal.