Causes of oxidation blackening of aluminum bronze surface

Why is the surface of aluminum bronze oxidized and blackened? There are several reasons for oxidation blackening of aluminum bronze surface:

1. oxidation reaction: aluminum in aluminum bronze easily reacts with oxygen in the air to form alumina. This oxide appears black or dark. This is a normal oxidation process, which is related to the chemical composition and structure of aluminum bronze materials.

2. Uneven formation of oxide layer: the oxide layer on the surface of aluminum bronze is uneven, and the thickness of oxide layer in some areas is large, which will deepen the color accordingly, resulting in the surface appearing black.

3. Pollutants and humid environment: The surface of aluminum bronze will be affected by pollutants and moisture from the environment, such as sulfide, sulfate and ammonia in the atmosphere. The interaction between these pollutants and moisture will lead to the formation of sulfide or sulfate on the surface of aluminum bronze, which will make the surface of aluminum bronze appear black.

4. High-temperature paint or coating treatment: high-temperature paint or coating treatment on aluminum bronze causes the surface oxide layer to turn black. This is caused by high temperature and chemical reaction. Aluminum, silvery white light metal. It has plasticity. Commodities are often made into bars, sheets, foils, powders, tapes and wires.