1. Exposure to Oxygen and Moisture: Rust is formed when iron, the main component of steel which car bodies are made of, reacts with oxygen and water (moisture). Car surfaces are constantly exposed to these elements through daily driving and environmental conditions.
2. Scratches or Chips in Paint: The paint on a car acts as a protective layer that shields the metal beneath from corrosive elements. However, scratches, chips, or any other damage to the paint can compromise its integrity and create pathways for water and oxygen to reach the bare metal.
3. Electrochemical Reaction: When water and oxygen come into contact with the exposed metal, an electrochemical reaction takes place. Iron atoms give up electrons to oxygen, forming iron oxide, commonly known as rust. This reaction is further accelerated by the presence of salt (such as from road salts) or acidic substances.
4. Blistering and Bubbles: As rust forms, it occupies more volume than the original metal. This expansion of the metal due to rusting creates pressure beneath the paint, causing it to blister and eventually form bubbles. These bubbles can be visible on the car's surface.
5. Spreading of Rust: Rust tends to spread over time, as the presence of moisture and oxygen fuels further oxidation. Once rust starts under the paint, it can continue to grow and compromise the surrounding metal if left untreated.
Rust bubbles are a common problem in older cars or vehicles that have been exposed to harsh conditions, frequent moisture, or insufficient maintenance. Regular car washing, paint touch-ups to prevent chipping, and proper rustproofing treatments can help prevent or slow down the formation of rust bubbles. If rust bubbles are noticed, it's important to address them promptly to prevent further damage and maintain the car's longevity.
