Cladding of Al Layer onto Mild Steel Substrate Using Al Powder and Its Structure and Properties

Abstract

Pure aluminum powder with grain sizes of 45 to 10μm preformed on aluminum (A1050) and mild steel (SPCC) substrates were rolled to form cladding materials at room temperature in air. The partial rolling reduction of the Al cladding layer was smaller than that of the A1050 substrate in an Al powder/A1050 cladding sheet. In contrast, the partial rolling reduction of the Al cladding layer was larger than that of the SPCC substrate in an Al powder/SPCC cladding sheet. The difference in the partial rolling reduction of the cladding layers and SPCC substrates became smaller with increasing total rolling reduction of the Al powder/SPCC cladding sheets. The shear adhesion strength of the Al powder/SPCC cladding sheet was about 40MPa, which decreased to about 10MPa after heat treatment at 773K for 3.6ks. The intermetallic compounds were formed between the cladding layer and the substrate after heat treatment at 773K for 3.6ks. Also, the cladding layer showed excellent oxidation resistance compared with cast iron after heat treatment at 1073K for 36ks in air, though light oxidation occurred in specimens after heat treatment at 773K for 36ks in air.