Rust
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(→Why do older cars rust more than newer cars?) |
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[[Image:Rust at battery tray old versus new.JPG|thumb|300px|A rusted battery tray alongside a new one.]] | [[Image:Rust at battery tray old versus new.JPG|thumb|300px|A rusted battery tray alongside a new one.]] | ||
==What is rust and its causes?== | ==What is rust and its causes?== | ||
| − | Rust is a kind of corrosion -- a decay or breakdown of a material in reaction to its environment. Specifically, rust is an electrochemical corrosion that occurs in the presence of iron, oxygen, and water. Oxygen and water are available in the open air, and iron is the principal ingredient in steel. | + | Rust is a kind of corrosion/burning -- a decay or breakdown of a material in reaction to its environment. Specifically, rust is an electrochemical corrosion that occurs in the presence of iron, oxygen, and water. Oxygen and water are available in the open air, and iron is the principal ingredient in steel. |
For rust to occur it needs an anode (a piece of metal that gives up electrons), an electrolyte (a liquid that helps transport electrons), and a cathode (a piece of metal that accepts electrons). The more conductive the electrolyte, the quicker rust will occur. For this reason, humid air, salty air, or salty water will accelerate the formation of rust. | For rust to occur it needs an anode (a piece of metal that gives up electrons), an electrolyte (a liquid that helps transport electrons), and a cathode (a piece of metal that accepts electrons). The more conductive the electrolyte, the quicker rust will occur. For this reason, humid air, salty air, or salty water will accelerate the formation of rust. | ||
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*More salt is used on roads these days. | *More salt is used on roads these days. | ||
*Progressive evolution of engineered 'self rinsing' technology, such as strategically designed/placed drain holes to allow rain or wash water to purge body cavities of moisture absorbing rust producing sediments, moreover, robotic assembly methods to lessen the possibility of human error which may compromise the operation of such a design by 'less than precise' assembly. eg; the human worker adds an over-sized glob of body filler next to a fender well drain hole which inadvertently clogs it, causing the fender well to hold moisture laden debris instead. | *Progressive evolution of engineered 'self rinsing' technology, such as strategically designed/placed drain holes to allow rain or wash water to purge body cavities of moisture absorbing rust producing sediments, moreover, robotic assembly methods to lessen the possibility of human error which may compromise the operation of such a design by 'less than precise' assembly. eg; the human worker adds an over-sized glob of body filler next to a fender well drain hole which inadvertently clogs it, causing the fender well to hold moisture laden debris instead. | ||
| + | *Electrolysis due to some older cars (British) having 'positive ground' electrical systems -where the car's electrical system is basically all 'ground wires' instead. (eg: AMC Metropolitan assembled by Austin Motor Company in Longbridge, England -neither were they dipped in a rust preventing primer bath, then they were shipped in ocean salt air to be sold in USA) | ||
=Rust assessment= | =Rust assessment= | ||
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