PJ2
The BEA 2nd Interim Report states that AF447 had a Honeywell SSFDR 980-4700-42. Information on this recorder may be easily found on the web using standard search techniques. It may help with a few details. The link can't be posted because it is commercial material. The SSFDR weighs about 13 lbs and is mounted between frames 84 & 85 very close to the bottom of the airframe.
Thanks for the information on the recorder. Given that it is solid state, flash memory based, I would be pretty optimistic about being able to recover data if they find it.
I'm not certain how corrosion sensitive the circuit card and supporting electronics are. There could conceivably be corrosion of traces on the circuit board, power supply components, etc. However the individual chips are pretty unlikely to be damaged. They could be removed from the board and read out separately. Even if the leads / contacts on the chip packages are broken, there are still ways to work around it.
So here's to hoping they find it.