Inductive pins that have been soldered will not have rust spots under normal circumstances. What's going on? According to the analysis of quality inspection engineers, the recent continuous rain in Guangdong has led to an increase in environmental humidity in the inductance factory. It is highly likely that the long-term exposure of solder during placement has caused slight surface oxidation. This results in brownish red spots resembling rust on the pins of this I-shaped inductor.

The quality inspection engineer conducted a strict inspection on the repeated occurrences of the I-shaped inductors in this batch, and confirmed that the problem of rust spots on the inductor pins was only a special case and not a problem that occurred in the production process and process. The other H-type inductors are all good products, please rest assured that customers can use them.

During the normal production process of the manufacturer, workers strictly follow the company's relevant production process standards, and there are relatively few phenomena of rust spots on the inductance pins. In summer, the air is humid and coupled with continuous rain in recent days, the drying time of soldered inductance pins is longer than before, enhancing the possibility of pin oxidation. So inductance manufacturers and customers who use inductors should pay special attention to moisture and moisture prevention.

Generally speaking, there are five possible reasons for rust spots on inductance pins:

1. As mentioned earlier, due to the increase in air temperature, long-term contact between solder and high humidity air causes slight oxidation on the surface of the inductor pins. This situation has a higher probability of occurring in rainy weather. The solution is to control indoor humidity and avoid prolonged contact between newly soldered inductance pins and humid air.
2. When soldering inductance pins, there is too much flux, which can cause residual flux after soldering, and the drying time is too long, resulting in slight oxidation.
3. The inductance pins were not scraped clean in a timely manner after soldering, resulting in residue on the surface of the pins, resulting in yellow spots resembling rust spots.
4. Soldering for too long can lead to a decrease in purity and lead to oxidation of the pins. The solution is to replace the solder with a new one in a timely manner according to the factory regulations.
5. There is still a problem with residual soldering tin or flux. The residue on the inductance pins will react with each other after being immersed in oil, producing brownish red rust spots.