Chrome-plated thermostatic bath faucets protect against corrosion in several ways:

Physical Barrier: Chrome is a hard, dense material that forms a physical barrier between the metal of the faucet and the water or air, preventing corrosion from reaching the underlying metal. The chrome plating also resists scratches and tarnishing, which helps maintain the protective barrier.

Resistance to Oxidation: Chrome has a high resistance to oxidation, which is a common cause of corrosion. The chromium oxide layer that forms on the surface of the chrome plating when exposed to oxygen and moisture helps to prevent further oxidation and corrosion.

Chemical Inertness: Chrome is chemically inert, which means it does not react with most substances. This makes it resistant to corrosion caused by chemicals in the water or cleaning products.