The application of HEDP (hydroxyethyl diphosphonic acid) in pipeline pre coating is mainly reflected in the following aspects:
Corrosion inhibitor: HEDP, as an effective corrosion inhibitor, can be added to pipeline pre film to reduce corrosion of metal pipelines. It can form a protective film on the metal surface, inhibit the release of metal ions and electrochemical reactions, thereby extending the service life of the pipeline.
Scale inhibitor: HEDP can be used as a scale inhibitor in pipeline pre film to prevent hard water components such as calcium and magnesium ions from scaling on the inner wall of the pipeline. It can combine with these ions to form soluble complexes, preventing the formation and blockage of sediment.
Dispersant: HEDP has good dispersion performance, which can disperse small particles and impurities in the liquid phase of the pipeline pre film, preventing them from adhering to the inner wall of the pipeline. This helps to maintain the smoothness of the pipeline and the normal operation of the fluid.
PH regulator: HEDP can be used to adjust the pH value in the pre film of pipelines to maintain it within an appropriate range. An appropriate pH value helps to control corrosion and scale accumulation within the pipeline, and improves the overall stability of the pipeline system.
It should be noted that the use method and additive concentration of HEDP should be reasonably determined based on specific pipeline materials, water quality conditions, and usage requirements. During the application process, relevant safety operating regulations should also be followed and compatibility with other additives should be ensured. It is best to carry out pipeline pre coating treatment under professional guidance.