Aluminum Bronze Alloy for Corrosion-Resistant Rebar

摘要

Rebars of three alloys were investigated for resistance to chloride ions at twopH levels. The alloys were aluminum bronze, ductile iron and mild steel. Samples of mild steel rebar were selected from commercial sources. Rebars of aluminum bronze and ductile iron had to be produced by a custom-made process. Aluminum bronze rebar showed excellent corrosion resistance. Both ductile iron and steel had poor corrosion resistance, with ductile iron being somewhat better than mild steel. The mechanical properties of the custom-made aluminum bronze rebar tested lower than the steel rebar. It was demonstrated than an inexpensive cold working process called drawing could increase the mechanical properties of the aluminum bronze alloy. An 18% reduction in area by cold drawing was sufficient to raise the yield strength of aluminum bronze rebar to meet ASTM Specifications for steel rebar.