Trend of antistatic agent attenuation in pipelines
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A certain amount of antistatic agent must be added during the production of aviation kerosene; the main function of this antistatic agent is to increase electrical conductivity. My question is: why can the electrical conductivity of an anti-corrosion storage tank reach a stable value so quickly? In pipes without corrosion protection, the conductivity decreases significantly; in about 3 days, it drops from 300 ps/m to 50 ps/m. After being flushed again with jet fuel with high conductivity, it drops even further. Logically, in pipelines without anti-corrosion measures, where jet fuel comes into direct contact with the metal pipes, the electrical conductivity should be higher. Even if the anti-corrosion paint used is an antistatic one, it can’t be more conductive than metal, right?
I understood by looking up information. There is an error in the concept, and the reason is as follows: The principle of antistatic agents relies on the balance between polar groups and electric fields. The amount of polar groups affects the antistatic effect; since polar groups have a strong adsorption capacity on metal surfaces, this leads to rapid degradation of the antistatic agents in metal pipes, resulting in a fast decrease in conductivity. In contrast, anti-corrosion coatings have less adsorption for polar groups, so their degradation occurs more slowly.