How to unscrew the screw cap if it is rusty

Screw is a common fastener in our daily life, and its role is very important. However, due to long-term use or high ambient humidity, the screw cap will rust, making it difficult to unscrew it. Next, we will introduce some methods to help you solve this problem.
1. Use anti-rust agents:
Rust inhibitor is a special chemical product that can prevent screws from rusting. If you have found some rust on the screw caps, you can spray some anti-rust agent on the screw caps and let them sit for a while. The anti-rust agent will penetrate into the thread gap, decompose the rust material, and make the screw cap easy to loosen.
2. Use appropriate tools:
The right tool is key to unscrewing a screw cap. Depending on the size of the screw cap, choose an appropriate wrench or wrench socket. Make sure the tool fits the shape of the screw cap tightly to avoid damaging the threads. If the screw cap is very difficult to loosen, you can use some tools designed to loosen rusty screws, such as pliers or a torque wrench.
3. Heating screw cap:
If the screw cap is very stubborn, you can try heating it. By using a flame or a heat gun, heat the screw cap for a few minutes. The principle of thermal expansion and contraction will cause the screw cap to expand, reducing the friction between the threads, and then use a tool to loosen it. However, pay attention to safety during the heating process, make sure there are no flammable items around, and wear protective equipment.
4. Use lubricant:
Lubricant is a substance that coats threads to reduce friction and resistance. If the screw cap is severely rusted and cannot be tightened, you can first apply some lubricant to the threads, wait a few minutes, and then use a tool to loosen it. Common lubricants include mechanical oil, grease or silicone oil. You can choose the appropriate lubricant according to your needs.
5. Use refrigerant:
A cryogen is a tool that shrinks loose objects by lowering the temperature. If the screw cap is very stubborn, you can try using coolant. Spray coolant on the screw cap first, then wait a few minutes. As the screw cap shrinks due to low temperature, the friction between the threads will decrease, making the screw cap easier to loosen.
Through the above methods, I believe everyone now knows how to solve the problem of "how to unscrew the screw cap when it is rusty". Using rust inhibitors, proper tools, heat, or using lubricants and coolants are all very effective methods. Of course, be sure to ensure safety and follow correct usage before performing any operations.