The temperature of the electrolyte greatly affects the abrasion resistance of the oxide film. Generally speaking, if the temperature decreases, the abrasion resistance of the anodic oxide film on aluminum and aluminum alloys increases. This is due to the reduced dissolution rate of the electrolyte in the film, which leads to a higher hardness of the oxide film. It is advisable to control the temperature within ±2℃ for hard anodizing treatment to achieve a higher hardness oxide film.