Test of metal corrosion by methanol and methanol-gasoline

Metal corrosion by methanol and methanol-gasoline has become a key problem for methanol as one of substitute fuels. Many kinds of metal samples were dipped in methanol and methanol-gasoline. No obvious corrosion happened with the samples in pure methanol and M85, but the copper sample in M15 was obviously corroded. On the M100 electro-chemical test, copper samples separately act as anode and cathode, surface appearance shows that the copper connected with anode appears obviously pitting corrosion and the sample connected with cathode has no more corrosion. So, copper corrosion in M15 is both chemical corrosion and electro-chemical corrosion. Anode protection is necessary when ignition engine fueled with methanol.