Hi Vel,
Like Satchi said, there's lots of PhD courses listed on findaphd.
If you type in Water corrosion or Lead Oxide battery into the search, there's actually quite a few PhD courses listed, so you can have a flick through these and see if you find anything you fancy.
http://www.findaphd.com/search/?keywords=water%20corrosion
Each project also has a little icon on the RHS, which indicates if it is self-funded, fully funded, competitively funded etc. If you hover over the icons it tells you more about what they mean.
Also, we have a £5,000 PhD scholarship up for grabs at FindAPhD, which you can sign up for here if you are interested:
Hope this helps,
Nikki