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Automotive
Why does your car corrode?
Most of us see rust on cars every day. You may think that only older vehicles get rusty, but in reality it is hard to avoid getting rust spots on your car, no matter how old it is.
Paint scratches and nicks on your car are the breeding ground for a type of deterioration called pitting corrosion.
Pitting corrosion can occur when coated or painted surfaces, like the outside of your car, become chipped or nicked and then are exposed to a corrosive environment, such as water, dirt, or salty air.
To protect the metal in cars from corrosion and make cars look attractive, manufacturers apply protective coatings. These coatings include paint, a process called "electroplating," or a combination of both.
The thickness of an electroplated coating is very important. A thicker coating will last longer and hold up better during use. If the coating is not applied properly or is put on too thinly, it may peel or pit and allow corrosion to occur on the metal surface.
Careful examination of electroplated items will reveal thin or porous plating which could lead to early failure of the coating.
Where will you find corrosion on your car?
- Automobile body parts that have scratches or nicks (e.g. doors, metal bumpers)
- Chrome-plated trim
- Hinges and brackets
What can you do to control corrosion on your car?
- Remove rust and put on protective coating
- Repaint damaged areas
- Rinse off corrosive materials such as salt and sand quickly
- Replace damaged parts
- Before purchase, check car for smooth edges and finishes without chips, pits, or gaps
- Keep car surface clean and apply wax or polish regularly for protection
- Before purchase, check electroplated surface for thin spots
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