The basic type of aluminum and aluminum alloy corrosion

【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.

Lithium Battery

‌‌ lithium batteries are a class of batteries made of ‌ lithium metal or ‌ lithium alloy as positive/negative electrode materials and using a non-aqueous electrolyte solution. ‌ lithium batteries can be broadly divided into two categories: lithium metal batteries and ‌ lithium ion batteries. ‌
Lithium metal batteries: These batteries contain lithium in the metallic state and are usually non-rechargeable. Due to the very active chemical properties of lithium metal, its processing, preservation and use have very high environmental requirements.
Lithium-ion batteries: These batteries do not contain lithium in the metallic state and can be recharged. Lithium-ion batteries mainly rely on the movement of lithium ions between the positive and negative electrodes to work, and when charging, lithium ions are removed from the positive electrode and embedded into the negative electrode through the electrolyte; The opposite is true for electrical discharge. Lithium-ion batteries have a voltage range of 2.8V to 4.2V, typical voltage is 3.7V, lower than 2.8V or higher than 4.2V will cause damage to the battery risk.
The invention of the lithium battery can be traced back to 1912, by ‌Gilbert N. Lewis proposed and studied lithium metal batteries. Lithium-ion batteries, on the other hand, were started in the 1970s by ‌M. S. Whittingham. With the development of science and technology, lithium battery has become the mainstream, especially in ‌ portable electronic equipment widely used.

Rechargeable Lithium Battery, Li-ion Battery, 18650 Lithium Battery

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