Yes, zinc alloy can tarnish over time due to exposure to air, moisture, and chemicals. Tarnishing occurs when the zinc in the alloy reacts with oxygen, forming a dull, grayish layer on the surface. This process can be accelerated by environmental factors such as humidity and pollution. To prevent tarnishing, zinc alloy items can be coated with protective layers like lacquer or treated with anti-tarnish solutions. Regular cleaning and proper storage in a dry, airtight environment can also help maintain their appearance. Despite its susceptibility to tarnish, zinc alloy remains popular for its durability and versatility in various applications.