What are the specific aspects of the effect of temperature on the corrosion resistance of fluoroplastic pipe?

The effect of temperature on the corrosion resistance of fluoroplastic pipe is mainly reflected in the following aspects:
1. Changes in the performance of fluoroplastic materials
Changes in molecular structure
As the temperature rises, the molecular structure of fluoroplastics may change to a certain extent. For example, the movement of the molecular chain intensifies, which may lead to a weakening of the intermolecular force. This will change the physical properties of fluoroplastics, thereby affecting their resistance to corrosive media.
Take polytetrafluoroethylene (PTFE) as an example. At high temperatures, the crystallinity of PTFE may decrease, and the regularity of the molecular chain is destroyed, which reduces its corrosion resistance.
Decrease in mechanical properties
High temperature will reduce the mechanical properties of fluoroplastics, such as strength and hardness. When fluoroplastic pipes are subjected to external pressure or mechanical stress, they are more likely to deform or rupture, thereby providing a channel for corrosive media to enter the interior of the pipe and accelerate the corrosion process.
For example, fluoroplastic pipes used in high temperature environments may be more likely to break than at room temperature if they are impacted by external forces, causing corrosive media to penetrate into the interior of the pipe and cause corrosion.
2. Enhanced effect on corrosive media
Increased chemical activity
Rising temperature will increase the chemical activity of corrosive media. For example, corrosive substances such as strong acids and strong alkalis are more likely to react chemically with fluoroplastics at high temperatures, destroying the structure of fluoroplastic pipes and reducing their corrosion resistance.
For example, at high temperatures, the corrosion rate of concentrated hydrochloric acid on fluoroplastic pipes may be significantly accelerated, because high temperature makes the movement of hydrochloric acid molecules more intense, and the reaction activity with fluoroplastics is enhanced.
Accelerated diffusion rate
High temperature will accelerate the diffusion rate of corrosive media in fluoroplastics. Corrosive media can enter the interior of fluoroplastic pipes through penetration, diffusion, etc., and react chemically with the pipes. When the temperature rises, the thermal motion of molecules intensifies, the diffusion coefficient increases, and the corrosive media are more likely to penetrate into the internal structure of fluoroplastic pipes, thereby accelerating the corrosion process.
For example, in a high-temperature chemical production environment, corrosive gases or liquids are more likely to diffuse into the interior of fluoroplastic pipes and corrode the pipes.
3. Differences in the impact of different temperature ranges
Low temperature impact
Under low temperature conditions, fluoroplastics usually become harder and more brittle. Although low temperatures generally do not directly lead to a significant decrease in the corrosion resistance of fluoroplastic pipes, increased brittleness may make the pipes more likely to break when subjected to external impact or vibration, thereby providing an opportunity for corrosive media to enter.
For example, in cold climates, fluoroplastic pipes may crack if they are accidentally hit, which may lead to the infiltration of corrosive media and cause corrosion problems.
Medium temperature range
In the medium temperature range, the corrosion resistance of fluoroplastic pipes is relatively stable. However, with the increase in temperature and the extension of service time, a certain degree of corrosion may still occur. For example, some fluoroplastics may gradually be affected by certain corrosive media in the temperature range of 100℃ to 200℃, showing slight corrosion.
For example, in some industrial heating processes, fluoroplastic pipes in a medium temperature environment may show surface discoloration, increased roughness, etc. after long-term use, which may be caused by slight corrosion.
High temperature limit
When the temperature approaches or exceeds the tolerance limit of fluoroplastics, the corrosion resistance will drop sharply. Under extreme high temperature conditions, fluoroplastics may undergo severe deformation, softening, or even decomposition, completely losing their resistance to corrosive media.
For example, when PTFE exceeds its upper temperature limit (generally 260°C), it will quickly lose its excellent corrosion resistance and be severely corroded by highly corrosive media.
If you want to know the specific aspects of the impact of temperature on the corrosion resistance of fluoroplastic pipes, you can contact Tongtong and we will do our best to help you!