| Gallery, Projects and General > How do I?? |
| Methanol and metal comparability. |
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| S. Heslop:
--- Quote from: tomrux on January 22, 2015, 02:21:17 AM ---"Methanol is also a significant ingredient in napalm" Ahhhh no in aint. "napalm" is a contraction of Naptha and palm acid. 2 thickeners added to petroleum to produce napalm. I don't know that Methanol would be energetic enough to be effective in this use. --- End quote --- There wasn't any napthenic or palmitic acid in later compositions of napalm used by the Vietnam era. |
| David Jupp:
--- Quote from: dawesy on January 23, 2015, 04:13:34 AM ---Might make up a small test tank and fill with the mix and see what happens then --- End quote --- Much easier to just put some mix in a glass jar, then drop in an offcut of the proposed alloy. To make monitoring of your finished tank easy - include a small test coupon of the construction material that you can lift out from time to time to examine closely. |
| PekkaNF:
Yep. That is good old immersion test. It gives fast and repeatable results when there only a simple chemical resistance to be tested. However experience has shown that automoive fuel system is whole lot more complex. Ref. "Sour gas" and abrasion results when simple NBR fuel hoses were proven fine on laboratory, but not in reality, when subjected then new fuel injection features: Fuel aeration due to tank return line, increased flow rate etc. induced problems. I'm pretty sure that piece of clean aluminium would survive well on pure methanol on well controlled enviroment. I wonder what small exotic metal impurities, a little water on mix etc, would do? Pekka |
| David Jupp:
From the reference linked earlier;- Note that the OP wants a tank to hold Methanol/Water mix. Pure anhydrous methanol is mildly corrosive to lead and aluminum alloys..... Rate of attack on aluminum alloys is typically a slow pitting form of corrosion; however, it can be accelerated to the point of compromising integrity of structural components if not anticipated and monitored. Methanol-water solutions can be corrosive to some non-ferrous alloys depending on application and environmental circumstances. This caution applies to equipment built with copper alloy, galvanized steel, titanium, aluminum alloy components.... |
| dawesy:
just had a good read. think i will put a sample in a glass jar and monitor. it will be a month or so till i make the tank so ill keep the jar with the sample in and if it starts showing signs of degradation i can pull the tank for closer inspection. there is a 30um filter before the pump which i check and clean periodically also i go through 5 ltrs of water\meth in a couple of months so i can check during top up. |
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