If the charging chip oxidizes, you can try the following methods:
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1. Cleaning: In the case of light oxidation of the chip, the oxidation layer on the surface can be removed by cleaning. It can be cleaned with organic solvent, acid or alkali solution, such as acetone, isopropyl alcohol, methanol, hydrochloric acid, nitric acid, etc. But pay attention to dry in time after cleaning to avoid moisture again.
2. Chemical mechanical polishing: For more serious oxidation, chemical mechanical polishing (CMP) can be used to remove the oxide layer on the surface through friction and chemical action. This method requires the use of specific chemicals and abrasives, and needs to control the polishing time and pressure to avoid damage to the chip.
If the above methods do not solve the problem, it is recommended to consult a professional technician or contact the manufacturer for repair.
If the IC function has been irreversibly damaged, it is recommended to replace the chip.
If it is prevention, it is recommended that all PCB spray three anti-paint treatment.