Edd,
As others have said already, we all have our ways to cope and cutting is a very common one. You aren't alone, and if you could talk to your wife that would probably help.
The real issue isn't cutting, but NEEDING to cut. Things like drinking and cutting have the bad habit of leaving us exactly where we started, and maybe even set back some because we feel ashamed and guilty. The real way forward is to address your abuse issues so the need for cutting will eventually fade.
Are you in therapy? If not, this really is something to consider.
Much love,
Larry