Base oil oxidation explained in three levels: beginner | intermediate | advanced
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- Опубликовано: 8 сен 2024
- Oxidation of base oils is the primary way that lubricants degrade during service. Whether it is hydraulic, engine, turbine, gear or other application the reasons are the same: heat plus exposure to oxygen = oxidation. However, if we want a deeper understanding of the oxidation mechanism we need to explore the chemistry - in this video we explain oxidation of base oils in three levels:
1. Base oil cooking
2. Basic oxidation chemistry (OIL RIG)
3. The auto-oxidation cycle
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Your videos are answering tons of questions I couldn’t find answers for from the manufacturers of the products they claim prevent these issues. Thank you so much.
Glad to help! Please let us know if there’s a specific video you’re interested in - it helps inform future content!
very cool professor. Trying to visualize and understand what is happening to cast iron when it is polymerized by a fat. Your videos on polymerization, loss of viscosity, oxidation is fleshing out general principles that I can apply to my use case. Only took Chem I in Uni but I have orgo and physics random curiosity to get what is going on here. Interesting to see what the are intermediaries in an auto-oxidation cycle where iron is present as well.
What is it that causes the color, stickiness and other characteristics of sludge, gum and varnish? And what are the molecular/chemical reactions that cause them to form and stick within combustion engines? Having both the advanced and simple explanations really helps me to understand - please continue that format! I learn a lot from these videos - thank you so much!
Thanks for the feedback! We’ll try to incorporate the format into some more of these “fundamentals” videos. As to your question - sludge, gum and varnish are all byproducts of the oxidation process. Their stickiness is really two separate properties: adhesiveness and viscosity. The adhesiveness comes about because oxidation byproducts are highly polar molecules - as a result they are attracted to metallic surfaces by the same mechanism that antiwear additives are. The viscosity of the sludge increases as the oxidation introduces more oxygen atoms into hydrocarbon molecules, which increases the likelihood of forming hydrogen bonds. Given viscosity is dependent on the strength of intermolecular forces, this helps increase viscosity and give it that characteristic “guminess”.
@@LubricationExplained What is the cause of the different tone of color? I know it's because of carbon but I don't know what is the best explanation for it? Great videos by the way.
Perfect Explanation. Thanks a lot.
Thanks!
:) Mr. LE - Your show seems to be progressing like oil oxidation - Slow start - Become runaway chain reaction? :)
I kinda learned, when I tried cooking as a greedy li'l boy. House full of smoke - Pot turned Black -
Mum screaming - Kicked me out of kitchen... Oh - The sausage exploded...
Since then - Learned a bit more about oils - Still don't know much about cooking :(
Hahaha!
Astonishing explanation, many thanks
Glad you liked it!
I assume that runaway oxidation-particularly the intermediate species-are what drives some oil/fat containing foods to go rancid quickly once the beginning of rancidity (is that even a word?) begins?
Many thanks for your site-a real service to knowledge.
Great information.
I am currently looking into HGV vehicles that get produced but then have long build times at bodybuilders and 3rd party places so when the vehicle goes into service they are 2-3 years from when they were produced.
We have done some sampling and found the oxidation levels are already high and if not changed will cause issues down the line.
I have the oil sample reports if it is any interest to you. Kind regards Paul
Isn't this oxidative process the same as in combustion? In fuel it just happens a lot faster.
Yes - combustion is just a really fast oxidation process. It differs a little bit from base oil oxidation because with combustion the process happens so fast that we skip all the intermediate oxidation products and the fuel (mostly) turns into carbon dioxide plus water. With the slower oxidation process of base oils, the hydrocarbons will form intermediate products like acids, alcohols, peroxides etc. These are really important because as the oil ages, these intermediate products will cause things like deposits, sludge, varnish, increasing acid number, corrosion etc.
Oxidation is positive charge Reduction is negative charge. Reduction reduces the the charge below zero. Oxygen is seeking molecules and forming bonds with them and releasing heat in the process. Like friendship, forming bonds releases energy.
What a lovely sentiment!
how much % of antioxidant(zddp )need to add in base oil, for prevent oxidation
Can you pour very salty liquid on an empty detergent bottle, then liquid oxygen to recover the oil or any fuel from the plastic having a reaction? Pour hydrogen on a detergent bottle to recover any oil or viable fuel? Not saying toxic fumes don't happen
How can I purify pyrolysis fuel
Unfortunately fuel isn't really in my wheelhouse, but I have seen a few videos on RUclips which do a pretty good job explaining the process.
Is it true that the black deposite/sludge is ROOH ?