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Corrosion behaviour of boronized and unboronized AISI 1050 steel and chilled cast iron were investigated by the weight loss method. Corrosion studies were performed with 10 % H 2 S0 4 solution as a corrosive medium at temperatures 298, 333 and 353 Κ and 2 h immersion periods. The weight loss of AISI 1050 steel and chilled cast iron treated in the corrosive medium increased with increasing temperature. While the weight loss of the AISI 1050 steel increased exponentially with increasing temperature, the chilled cast iron showed continuously decreasing values. Very low weight losses were observed in boronized samples compared with unboronized samples. The boronizinig process significantly decreased the weight loss of both materials and improved the corrosion behaviour.