Corrosion Behavior of Stainless Steel Clad Rebar

Stainless steel clad rebar (SCR) was investigated because it may become a cost-effective means of controlling corrosion in concrete under very aggressive environments. Sound SCR (316L cladding) resisted corrosion in saturated Ca(OH)2 solution (SCS) with up to 5 wt % chloride. Cladding breaks on SCR induced significant corrosion of exposed underlying CS in SCS with only 1 wt % chloride. A computer model using laboratory data as input was constructed to evaluate the extent of galvanic corrosion of SCR. Modeling indicated that concrete resistivity and size of the cladding break are the main controlling factors of galvanic corrosion