Oh his normal hair? Yeah it probably would be burned. Not instantaneously but gradually sure. Even without Satan hair though, Sani's fry Gaeshi pre end of 4 beast arc could deflect something like 300,000,000 tons. I forget the number. If Akainu used a magma fist, it can be deflected x1000. If Akainu used haki he'd receive a haki infused magma fist 1000x over.