recarbonize
/rɪˈkɑːbənʌɪz/ /rɪˈkɑːb(ə)nʌɪz/(also recarbonise)
verb
[with object] To recombine (a substance) with carbon; to reintroduce carbon into or increase the carbon content of (a metal, alloy, etc.).
Origin
Early 19th century; earliest use found in Philosophical Transactions of the Royal Society of London. From re- + carbonize.