The basic type of aluminum and aluminum alloy corrosion

【China Aluminum Network】 1. Crevice Corrosion Crevice corrosion is a type of localized corrosion. Metal components in the electrolyte solution, due to the formation of gaps between the metal and the metal or metal and non-metal, its width is enough to make the medium immersed and the medium is in a stagnant state, making the phenomenon of increased corrosion within the gap is called crevice corrosion.

2. Spot Corrosion Corrosion, also known as hole corrosion, is a type of localized corrosion pattern in the metal that produces needlepoints, dots, and holes. As the temperature of the solution increases, the solute concentration increases, which promotes the corrosion of aluminum.

3. Stress corrosion cracking The SCC of aluminum alloys was discovered in the early 1930s. SCC is characterized by the formation of corrosion-mechanical cracks that can either grow along grain boundaries or extend through grains. Since the crack propagation is inside the metal, the strength of the metal structure will be greatly reduced, and sudden damage will occur in severe cases. The destruction of metal under the combined action of stress and corrosive media is known as SCC.

4. Uniform corrosion of aluminum In solutions such as phosphoric acid and sodium hydroxide, the oxide film thereon dissolves, causing uniform corrosion, and the dissolution rate is uniform. Pit corrosion is a unique form of anodic reaction. It is an autocatalytic process in which the conditions caused by the corrosion process within the pitted pits both promote and sustain corrosion.

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