Oxidation occurs on alloy wheels due to exposure to oxygen and moisture in the environment. The combination of these two elements causes a chemical reaction that forms a layer of rust and corrosion on the surface of the wheels. This process is accelerated by factors such as road salt, chemicals used for de-icing, and harsh weather conditions. Regular cleaning and maintenance of alloy wheels can help prevent oxidation and prolong their lifespan. Using protective coatings, such as sealants or wax, can also create a barrier between the wheels and the elements, reducing the likelihood of oxidation. Additionally, avoid parking near industrial areas or using abrasive cleaners that can damage the wheels and make them more susceptible to oxidation.