Corrosion inhibitor for equipment
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In media with high levels of H2S, CO2, and CL-, corrosion inhibitors are generally added to pipelines at regular intervals and in fixed amounts. Under normal circumstances, once the addition of these inhibitors stops, how long can the protective film they form on the metal surface remain intact? In other words, under what conditions is this protective film destroyed? Are there any corrosion inhibitors that can maintain such a protective film over a long period of time? I would appreciate it if an expert could answer this question. Thank you!
For the corrosion caused by S ions and CL ions, the hot-dip aluminizing method yields excellent results in terms of corrosion resistance, as well as wear and high-temperature resistance
Different retardants, varying levels of corrosive media, different flow rates, and different pipeline materials can all affect the time required. We can only obtain this data from the manufacturers of the sustained-release agents. Moreover, this data is also inaccurate and is for reference only.
Blue-826 has a validity period of 6 hours
This is how I understand what LZ means: adding a film-forming agent once creates a protective layer in the pipeline that can remain effective for a quite long time. But as far as I know, such film-forming slow-release agents do not yet exist. The duration for which a slow-release agent remains in its film form is short; the exact time depends on specific conditions. Therefore, it is necessary to continuously add such agents in order to maintain a stable inner layer on the pipes. If LZ does not want to keep adding film-forming agents, then use an anti-corrosion coating inside the pipeline. However, slow-release additives are the preferred choice among major refineries, requiring a small amount to achieve significant effects. Components of common slow-release agents: imidazolines (modified with ethylene oxide or acrylic acid), organic amines (ethylenediamine is too expensive and is being phased out), 1227, antifoam agents (may not be added), water (preferably deionized water).
Our corrosion inhibitors generally provide protection for about 3 to 6 hours, but this is not an exact figure; it depends on the corrosion conditions at the site as well as the composition of the corrosion inhibitor. Moreover, the action of corrosion inhibitors requires the continuous formation of a film; if a certain area loses protection, galvanic corrosion occurs, which damages the pipeline. This type of corrosion is pitting corrosion rather than uniform corrosion, and it is more harmful.
It’s a good idea, but it’s impossible. No anti-corrosion technique can provide a permanent solution.
Passivation film formation is possible, of course; continuous addition is necessary! The interval time can be extended, compared to imidazoline-based adsorption films