The Collaborative International Dictionary of English v.0.48:

Decarbonize \De*car"bon*ize\, v. t. [imp. & p. p.
   Decarbonized; p. pr. & vb. n. Decarbonizing.]
   To deprive of carbon; as, to decarbonize steel; to
   decarbonize the blood.
   [1913 Webster]

   Decarbonized iron. See Malleable iron.

   Decarbonized steel, homogenous wrought iron made by a steel
      process, as that of Bessemer; ingot iron.
      [1913 Webster]

WordNet (r) 3.0 (2006):

decarbonize
    v 1: remove carbon from (an engine) [syn: decarbonize,
         decarbonise, decarburize, decarburise, decoke]