Galvanic Corrosion Potential of ChromX Reinforcement

Abstract

The corrosion potential of ChromX 9100 and 4100 steel (ASTM A1035 Type CS and CM), Type 2205 and 2304 stainless steels, and ASTM A1094 galvanized reinforcement was evaluated in this study. Reinforcement was evaluated in moving simulated seawater prepared in accordance with ASTM D1141at temperatures of 50 °F, 65 °F, and 80 °F for a period of one week. A1035 reinforcement was evaluated both before and after removal of the mill scale on the bars. The corrosion potentials of 2205 and 2304 stainless steels were the least negative of those evaluated in this study, approximately –0.2 vs a copper sulfate electrode (CSE). A1035 Type CS and CM reinforcement exhibited potentials of approximately –0.5 V and –0.6 V vs. CSE, respectively. With the exception of A1035 Type CS reinforcement at 50 °F, the removal of mill scale did not alter the corrosion potential of A1035 reinforcement. A1094 reinforcement exhibited the most negative potential, around –1.05 V vs. CSE.