Hello, I'm currently working on a research project of corrosion inhibitors using cigarette butts. From the studies I've seen on the subject, it requires a high concentration of inhibitor for it to be efficient. For example, results show that the inhibition efficiencies arrive at 94.6% and 91.7% in 10% and 15% (wt%) HCl solution, respectively, by adding 5% (wt%) inhibitor.
Would this mean that since more than 1,000ppm concentration is needed, the inhibitor is not efficient? Is it really necesary for the inhibitor to be in normal 200-5,000ppm standards? Are there any industries that use such high concentrations of inhibitors? Would there be a way to combine the inhibitor with another substance to make it more efficient with less concentration?
I attach the file of the research (not my research) for citing purposes.
Most organic inhibitors protect the adsorption of one or two molecules that are monomolecular in layers on surface steel. In tobacco, there is a good nicotine inhibitor. Calculate the size of the nicotine molecule and determine its concentration. It will be minimal. So you will answer your question.
Best regards.
The minimum effective concentration is dependent on environmental conditions and the properties of the inhibiting species you are using. I work in the oil field and we treat between 15 ppm and 5%. In the example that you are citing you are working with high acid concentration similar to that used in a stimulation. It is not uncommon in these situations to use up to 2 - 5% inhibitor. You could test you inhibitor using an acid gas (CO2) to get another vantage point of the effectiveness of your product to protect from corrosion.
Please check the following discussion for its possible interest concerning to your query: https://www.researchgate.net/post/optimum_concentration_of_corrosion_inhibitor
The cigarette butt water extracts is a mixture of cigarette butt extracts and water. So the actual inhibitor percent used with HCl must base on the amount of cigarette butt extracts and not on the amount of cigarette butt water extracts. If you do this correction the concentration is in ppm range.
Best regards
Hi there,
Is it used cigarette butts directly as corrosion inhibitors without any pre-treatments such as purification and what is the solvent you used ? and I saw the concentration more than 1000ppm it's high and opposite with understanding of corrosion inhibitors which used at low concentration to achieve a suitable protection.
Good Luck,
If u wanna to reach high efficiency u should use an inhibitor with high hetero atoms. Because these atoms are playing a vital role in adsorption. (Especially S).
Optimum concentration at which the inhibitor effect is maximum, beyond that the corrosion rate again increases. It depends up on anchoring site and the adsorption characteristic of the material. The inhibition efficiency increases with increasing the inhibitors concentration. Usually 2 to 5% inhibitors are used to prevent corrosion.
i think you need to purification the cigarette butts, and try again, you can get same IE% with less concentration
Dear Miguel De Llano
There is no universal corrosion inhibitor. Each inhibitor must be tested depending on operating conditions. However, corrosion inhibitors are chemicals when added in small concentration, effectively reduced the corrosion rate. I think a concentration around 1% maybe sufficient. Higher concentration maybe uneconomic and costly. Furthermore, increasing concentration may change the physical properties of aqueous medium.
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