Oxidation resistance of tin bronze
Tin bronze has a certain degree of oxidation resistance. In tin bronze, the element tin (Sn) itself contributes to the oxidation resistance of the alloy. Sn forms a dense oxide film on the surface of the alloy, which slows down the oxidation process by preventing oxygen from coming into further contact with the metal atoms inside the alloy.
For example, in atmospheric environments, tin bronze can maintain its surface luster and properties for an extended period of time without significant rusting due to oxidation. Especially in general indoor environments or outdoor environments with low humidity, the oxidation resistance of tin bronze can meet the requirements of most application scenarios.

Oxidation Resistance of Aluminum Bronze
Aluminum bronze also has good oxidation resistance. This is mainly attributed to the element aluminum (Al), which reacts preferentially with oxygen when aluminum bronze is exposed to air, forming a strong protective film of aluminum oxide (Al₂O₃) on the surface of the alloy. This alumina film is very dense and effectively prevents corrosive media such as oxygen and water vapor from attacking the interior of the alloy.
Compared with tin bronze, aluminum bronze may have an advantage in oxidation resistance at high temperatures. Because the aluminum oxide film can still maintain good stability at high temperatures, while tin bronze at high temperatures the protective effect of its oxide film may be weakened. For example, in some industrial furnace components or high-temperature piping systems, if the use of bronze materials, the oxidation resistance of aluminum bronze may be more suitable for this high-temperature oxidation environment.

Comprehensive Comparison
At normal room temperature, the oxidation resistance of tin bronze and aluminum bronze can meet the basic requirements of use, and their performance is comparable.
However, at high temperatures (e.g., over 300 – 400°C), the oxidation resistance of aluminum bronze is usually better than that of tin bronze because the protective film of aluminum oxide formed on its surface is more stable at high temperatures.