ã€China Aluminum Industry Network】1. Spot Corrosion Corrosion, also known as hole erosion, is a type of localized corrosion pattern that produces needle-point, dot, and hole-like patterns on metals. 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.
2. Uniform corrosion of aluminum in the phosphoric acid and sodium hydroxide solution, the oxide film on it will dissolve, resulting in uniform corrosion, dissolution rate is uniform. As the temperature of the solution increases, the solute concentration increases, which promotes the corrosion of aluminum.
3. 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.
4. Stress Corrosion Cracking (SCC) The SCC of aluminum alloys was discovered in the early 1930s. A type of damage that occurs under the combined action of stress (tension or internal stress) and corrosive media is known as SCC. 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. SCC can only occur under certain conditions. They are: - A certain tensile stress or residual stress inside the metal.
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