You cannot make violence against wives illegal since the Koran commends it. From Surah 4:34
Men are in charge of women by [right of] what Allah has given one over the other and what they spend [for maintenance] from their wealth. So righteous women are devoutly obedient, guarding in [the husband’s] absence what Allah would have them guard. But those [wives] from whom you fear arrogance – [first] advise them; [then if they persist], forsake them in bed; and [finally], strike them. But if they obey you [once more], seek no means against them. Indeed, Allah is ever Exalted and Grand.
Via Clarion:
After being first proposed in 2006, the Moroccan parliament passed a historic legislation criminalizing violence against women. However, while the law extends the definition of violence to many acts of aggression against women, spousal abuse – including marital rape – is excluded from the new law.