What causes the rust of injection molds? How to avoid it?
Injection molds are mostly made of tool steel. During work, it encounters corrosive gases, water and other substances that cause rust. Plastic parts made from rusty molds will have quality problems, so this problem should be eliminated. There are three main reasons for the rust of the injection mold.
- The gas produced by the decomposition of the melt
- Cooling water in the mold
- Carbides produced during molding
- Don’t put it in a humid place
Everyone should know the consequences of putting iron in water, so when storing molds, we should choose a place that is ventilated and dry, where it is far from the ground. Because there is moisture on the ground. Please try to put it on the shelf so that you will not need to worry about the mold rust. Do not touch the mold directly with your hands, so as not to corrode the mold with sweat. If the mold is cooled below the dew point, the moisture in the air will form water droplets on the surface of the mold. If it is not wiped off and dried in time, it is easy to rust. After cleaning the mold with mold cleaning agent, the water vapor on the mold should be dried in time.
- Try to cool down before spraying rust inhibitor
If the mold is sprayed with anti-rust oil at high temperature, it will absorb the moisture in the anti-rust agent. If the moisture is absorbed, rust may occur. Therefore, the best way is to wait for the mold temperature to cool down before spraying the anti-corrosion agent.
- Spray evenly on the surface of the mold
When using the rust inhibitor, spray it evenly, try to avoid spraying at one spot, and spray evenly on the surface of the mold twice or more to make sure that there is no missing spray.
- Use long-term mold rust inhibitor
Do not use dry vaporizing rust inhibitors for molds that are not frequently changed, not used for a long time, and need to be stored for a long time. It is recommended to use ordinary oily rust inhibitors and keep them sealed.