The aluminum frame is used as the frame bracket of the photovoltaic module to protect the glass edge of the module, and its combination with silicone can enhance the density of the module....
The aluminum frame is used as the frame bracket of the photovoltaic module to protect the glass edge of the module, and its combination with silicone can enhance the density of the module.
It can also improve the overall mechanical strength of the module and facilitate the installation and transportation of the module [1]. The surface of the aluminum frame is a silver-white film, and the main component is Al2O3. Based on the corrosion and discoloration of the aluminum frame surface found during random inspection, this paper mainly analyzes the causes of the corrosion and discoloration of the aluminum frame surface, and the influence of the corrosion on the reliability of the components.
The characteristics of the aluminum frame are mainly reflected by the oxide film on its surface. After the substrate is anodized, a layer can be attached to the surface.
The oxide film, the main component is Al2O3, can make the frame have good corrosion resistance, enhance wear resistance and improve hardness; and the Al2O3 film itself is also a high-resistance insulating film, which can keep the aluminum frame in good insulation.
1) The main reason for this abnormal quality is that after the box is wetted, NaOH dissolves in water and reacts with the oxide film.
2) From the perspective of reliability, the aluminum frame is only damaged in appearance, its film thickness and hardness can meet the index requirements before and after the aging test, and the component reliability test is qualified, indicating that the aluminum frame still has the properties of corrosion resistance, pollution resistance and insulation. ability.
3) When the components are in storage, the packing box should be well protected from moisture and rain. Once the box is wet, it will be sealed for a long time.
The oxide film is at risk of being corroded; if the temperature increases and the time is prolonged, the oxide film will eventually be corroded, which will destroy the substrate and affect the reliability of the component.
