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How do you remove corrosion from coolant? 

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An analytical method based on high-performance liquid chromatography is suitable for the determination of corrosion inhibitors in coolant solutions based on ethylene glycol.
The damaged surface corrosion has been found to be a consequence of corrosion-induced delamination of the coating, which enhances the propagation of corrosion from the damaged site.
The experimental results showed that the new amine-free coolant has good corrosion inhibition equivalent to conventional amine-containing coolants.
This method of analysis should prove valuable in corrosion studies and is uniquely capable of following the changes in soluble chromium concentration in PWR coolant that follow operational changes in the reactor.
From the results obtained it was inferred that samples subjected to deep cryogenic corrosion treatment were having enhanced corrosion resistance.
A general decrease in diameter, especially on the coolant-water entrance point where turbulent flow was likely, also suggests a chemically and mechanically-driven corrosion effect.
Furthermore, serious concerns are associated with the transport of activated corrosion products by the PbLi coolant.
This suggests that the local transient radiolytic oxidising species produced in the coolant by the β − particles could contribute to corrosion enhancement, by increasing the local corrosion potential.
This study provides some useful information for the design of NaK coolant systems and some recommendations for what additional experimental and theoretical work is needed to understand the corrosion mechanisms and limitations of using NaK as a primary coolant.
The obtained results provide information on damage relevant parameters and their interaction with coolant inducing corrosion on hot aluminum surfaces.