Rapid Macrocell Tests of LDX 2101® Stainless Steel Bars

The corrosion resistance of LDX 2101® duplex stainless steel bars is evaluated using the rapid macrocell test specified in Annex A2 of ASTM A955-09b and compared to the performance of 2205 pickled stainless steel (2205p). LDX 2101® bars were tested in the asreceived condition as well as after submersion in simulated concrete pore solution with a pH of 13.4 for two weeks prior to testing. The LDX 2101® stainless steel bars meet the requirements of ASTM A955-09b, exhibiting limited staining and slight corrosion on the bars in salt solution with a maximum individual corrosion rate of 0.44 μm/yr and a maximum average corrosion rate of 0.10 μm/yr. No significant difference was observed in the behavior between bars tested in the as-received condition and bars tested after submersion in simulated concrete pore solution. The 2205p bars exhibited no visible corrosion products on the bars in salt solution and no measureable corrosion. Both the LDX 2101® and 2205p stainless steel bars exhibited moderate staining of the bars used as cathodes in oxygenated pore solution