A competator has introduced an aluminum burial vault that will be exposed to Formic Acid.  Formic acid exposure will take place as a gas and later as a liquid.  Formic acid is a product of decomposition of the human body.  I have been asked to provide relative information for comparison to steel.  I've read some "old" information on aluminum corrosion tests in soil.  There is mention of PH, drainage, & soil conductivity.  I need more information to complete the picture.
Please help.