How corrosion inhibitors protect metal: synthesis in the lab and testing

Laboratory synthesis and systematic testing of a corrosion inhibitor commonly found in engine oils. This inhibitor is the reaction product of 2,5-dimercapto-1,3,4-thiadiazole and oleic acid.

[NileRed]

Really cool stuff! I had absolutely no idea how those corrosion inhibitors worked.

[bertholtappels]

“Hope you found that interesting?” Understatement of the year. This is nothing short of awesome. I am not a chemist and I have no real immediate need for knowledge about corrosion inhibition. But I learned an incredible amount. Thanks for the experiment and the best-on-YouTube explanation style.

[simonecasolo]

I am corrosion engineer in the subsea business. You did a great job! N-compounds stick and protect copper alloys (brass, bronze, etc) while S-compound protect steels, this os why we use both N & S.
You should work with VpCI (vapour phase inhibitors) we use them in closed plastic bags for storing electronics during sea transport

[placidesulfurik]

Dude, never stop posting. You're the best channel on YT, period.

[rwbishop]

Interesting video thanks! For a related pdf from the FAA covering aircraft corrosion control, go to the FAA's website, then under 'Advisory Circulars', search for 43-4B. It's about 6.6MB [1], and covers a wide range of materials. As you can imagine, corrosion has always been a major nemesis of aircraft, and a lot of time, effort & research has gone into it's prevention & mitigation. While at the FAA website note there are many other very informative 'advisory circulars'[2], ranging from single page, through multi volume text books... and all free! (Another great one is AC 43.13-1B, titled 'Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair'.
[1] Note that recently cancelled 43-4A is there as well.
[2] The 'AC' prefix seen frequently on/in these documents merely stands for 'Advisory Circular'... the FAA likes & uses that terminology a lot.

[TechIngredients]

Very well done!
The synthesis was interesting and suggests that there might be some applications where this molecule is bonded to resins like epoxy and polyester to produce corrosion inhibiting coatings and paints.
Thanks

[hinz]

Chloride ions definitely have an influence on corrosion rate, it's not just the conductivity. It's also how well the ions can complex the iron, chloride ions do that much better than i.e. formiate salts.

[cliffjones]

From my Employment Working for the Navy in electronics I would suggest to Try Dow Corning®3140 RTV MIL-A-46146 specifications, Coating is for electronics because it doesn't have acetic acid (which would damage electrical parts and metals). For your gasket sealant. In military electronics it is a mil spec requirement for sealing (among other sealants). We used several types Deoxit for rotary switches, potentiometer's, electrical plugs and sockets. They would clean and protect the above mentioned parts.


 In another vein of thought, another corrosive breakdown chemical that was heavily relied upon for corroded nuts and bolts on electronic equipment was a brand called Kriol, can you give an explanation of how that works. As a sidelight when we couldn't get frozen corroded parts to release, we had an electrical apparatus in the machine shop called Electric Discharge Machining (EDM) Process that would remove them without damage. One reason I mentioned all of this is, Remember the Navy works in a salt environment year round.

[nunyabusiness]

it’s not just the abundance of information that you have, but it’s your cadence, sentence flow, and timing on your videos that make them endlessly rewatchable to me.

[mozkitolife]

"Quite a nice smell. Almost minty."

Nose falls off.

[dalitas]

Chloride is also a pitting agent, it binds to the Fe on the surface, in essence removing an Fe-Fe bond and creating an Fe-Cl bond, this reduces the cohesion making it easier for the Fe to leave the surface

[RichardCasto]

I experienced the Acetic acid effect recently by accident. I was resealing an old fish tank and had used razor blades to remove the old silicone seals. I had left a blade in the bottom of the tank when it was resealed using new silicone caulk. It seems that the outgassed Acetic acid vapor is heavier than air and tended to remain in the tank. After curing overnight the previously shiny razor blade was a now very smooth and consistent earthy brown color.

[Watchyn_Yarwood]

Super interesting, as always! Thanks for sharing!

[GarageWoodworks]

FYI: To simplify your apparatus at 9:05, insert a rubber septa on your round bottom with your reagents already inside. Fill a balloon with argon and attach it to a plastic syringe with the plunger removed (easier to attach the balloon to the syringe before filling with argon - use Parafilm to seal balloon/syringe). With a needle on the syringe, pierce the rubber septa. To purge with argon from the balloon, use a second syringe to pierce the septa and draw (pull syringe plunger) air/argon from the round bottom a few times. Leave the balloon/syringe/needle in the septa during the reaction. This will maintain a slight positive pressure of argon in the round bottom. This inert reaction setup with a balloon is done routinely in chem labs.

[albertbadal]

Hi dude, I am an engineer working in the production chemical for upstream O&G. You are an extremely talented engineer and while we are striving everyday to come up with much more complicated corrosion inhibitor molecules, I thoroughly enjoyed your approach in synthesizing, applying and testing the concept. I am sending your video as an educational tool to our technical group as just like you said, we sometimes go way deep in the rabbit hole and forget how things are fundamentally sound when you have a fresh perspective. We utilize RCA, RCE and jet impingement tests to determine the efficacy of corrosion inhibitors by using synthetic brine (5% - NaCl) to mimic produced water, 100% CO2 (or 45 psi partial pressures) and sometimes 10-50 ppm of H2S to replicate the worst reservoir conditions. Great work.

[KnowledgePerformance]

Thank you for making all of this information free to us! I absolutely love your amazing projects and every upload is incredible. I have learned so much from these videos

[Woloszow]

Salt has one more special property. Chloride ions are quite agressive against any passivation layer and are capable of creating small spots with pH much lower than surroundings. Additionally chloride ions may complexe metal ions, hindering build up of tight rust layer, which would slow down the corrosion. Especially it shows its agressiveness against stainless steel (pitting) and aluminium, but also helps with corrosion of plain steel.

[samykamkar]

Very cool, and really impressive results!

[tom_something]

From about 1:05 to 4:21, I think that was all shot in one take. You consistently deliver such clear explanations, without needing a zillion edits. It's really admirable and appreciated. The chemistry nomenclature is interesting too. When you explained the "mercapto" and I thought, "I wonder if that means ethyl mercaptain looks like.... this... yep." Very cool when that happens.

[saml]

I'm gonna try this synthesis on Monday when I get to the lab! Excellent video (it's kind of a given with you), I really appreciate the thought and work you put into this stuff. I'm a farmer, but I've been going back to school for biochemistry recently and you're a big driver in renewing my interest in the sciences. I've been watching your videos for two years and I finally got fed with my limited understanding of some of the topics at hand, so I decided to do something about it. It's incredibly rewarding for me to watch this video today because I finally understand everything you went over, that's huge for me. Thank you for your continued work, I really appreciate what you do and I wanted you to know exactly what kind of life changing impact your videos have had on me. Cheers!