Since battery acid is obviously corrosive, how is it that the battery casing can stay intact?
Answer:
The container that is used is a plastice or polypropylene material which is chemically resistant to acids or even solvents. It wouldnt be made of metal because if it were the the electrochemical reaction inside would not take place. It would interfere with the lead plates inside the battery.
The casing is made of a material (a plastic or rubber) which the acid does not attack. The acid, though corrosive, is not a universal solvent. (Puzzle: in what sort of container do you keep the universal solvent?)
The battery case is made of a chemically inert material that will not corrode. Glass, rubber, and various plastics have been used.
Damn! Clever, these Chinese, aren't they?
that plastic will last ~1000 yrs
They are usually lead-acid batteries that provide a nominal 12-volt (actually 12.6 volts) potential difference by serially connecting six cells that each produce about 2 to 2.1 volts. As other batteries of its type, it is made up of plates of lead and lead oxide. These plates are submerged into a 35% sulfuric acid and 65% water solution called the electrolyte solution. This process causes a chemical reaction that releases electrons, allowing them to flow through conductors thus producing electricity. As a lead acid battery discharges, the materials of the lead plates react with the acid of the electrolyte, changing the surface of both plates to lead sulphate. When the battery is recharged, the chemical reaction is reversed. The lead sulphate reforms into lead oxide and lead, restoring the plates to their original condition, allowing the process to be repeated...
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