Greetings,
My question is very simple. We all know that essential oil does not mix with water and will just float on the water surface. So, let say I want to test its corrosion inhibitive property for a steel that is immersed in 3.5% NaCl, if I just simply added the essential oil, I do not think it will be in contact with the steel.. Not to mention its dispersibility in the water will be not so good. But, I have seen quite a number articles published to highlight the corrosion inhibitive nature of essential oils. So, can someone enlighten me on how to make this possible? (Do I need an emulsifier or not?)
Wan Mohamad Ikhmal
Prepare steel plates, polish them, wipe the plate with oil using a cotton tampon. Pre-determine the weight of the plates and determine the corrosion by the gravimetric method. After immersion in a salt solution, only an adsorption layer of oil will remain on the plate, which protects it from corrosion. Over time, an equilibrium will be established between the amount of adsorbed oil and the amount of dissolved oil in the solution.
Dear Dr. Wan Mohamad Ikhmal ,
in addition to what Dr. Yuri Mirgorod has already said, you could create an essential oil layer on your metal sample in different ways, as if it were a normal coatings ... dipping, spraying, spreading a film ... the doubt that arises , having never worked directly with essential oils - even if I have worked on the protection of materials using particular lubricating oils that can be used as "temporary corrosion inhibitors" in the marine environment - characterize the surface layer, after preparation and after immersion in solution of NaCl (for different periods of time ...). To determine its presence, especially after exposure, I used IR spectrophotometry (with a suitable FT-IR instrument equipped with an accessory for specular reflectance). The quantity of inhibitor in contact with the sample could be determined before the immersion tests in a gravimetric way but if the compound is poorly adherent and the situation becomes more complicated ...
If you need, let me know any details ...
My best regards, Pierluigi Traverso.
Dear Dr Wan Mohamad Ikhmal . See the following useful RG link: Article A study of the anti-corrosive effects of essential oils of r...
Kindly see also the following very good RG link: Article Corrosion inhibition effect of citrus sinensis essential oil...
Also check please the following useful RG link: Article The Potential Use of Myrtus Oil as a Corrosion Inhibitor of ...
Thank you so much Dr. Pierluigi Traverso and Dr. Aref Wazwaz for the insights !! :)
You are most welcome dear
Dr Wan Mohamad Ikhmal
Wish you the best always
Dear Wan Mohamad Ikhmal
Two trends are practiced for using the essential oil as corrosion inhibitor in corrosion inhibition efficiency evaluation tests, either used as defined essential oil extracts which are normally water soluble, or used as pure essential oil which needs to dissolve in suitable emulsifier like teen 80 which is able to dispersing the oil, to be water soluble of solubility up to 100ml/l . For that you are right that essential oil can't used alone as inhibitor, before proper pretreatment steps.
Best regards
Dear Dr. Aref Wazwaz
For the article: Article A study of the anti-corrosive effects of essential oils of r...
It says that: "The inhibitor solution was prepared by dissolving a mass of oil in tween 80 (m, 1/2m) to finally obtain the following concentrations: 1.25, 2.5, 5 and 10 g/L. Then, the corrosion solution was made using the prepared concentrations of essential oil as inhibitors in a 3% by weight NaCl solution"
May I ask, does this means that the mass of essential oil is fixed and that the concentration such as 1.25 g/L indicates 1.25 g of mixture (EO+Tween80) in 1 L of 3% NaCl solution? Is this the correct understanding..
Also, what does "m, 1/2" meant?
Thank you so much Dr.
Dear Dr Wan Mohamad Ikhmal . I think : mass of oil is fixed , 3% NaCl solution will be used in the last step as a solvent of mixing . Mass of oil in Tween (m, 1/2m) this means that the mass ratio of mixing between oil and Tween (for example 1 g oil with 1/2 g Tween). Wish you the best.
You are most welcome dear
Dr Wan Mohamad Ikhmal at any time. Wish you the best always.
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