Study On Preparation Process And Properties Of Aluminium Substrate PS Plate

By analyzing and comparing the microstructures,mechanical properties and electrolytic corrosion properties of 1050 and 1052 Aluminum alloys produced by the same forming parameters of melt casting,homogenization treatment,hot rolling, intermediate annealing and cold rolling,the alloy with better properties was chosen for further study.The effects of hot-rolling reduction,deformation temperature, intermediate-annealing temperature and cold-rolling reduction on mechanical properties of the chosen alloy were investigated by optical microscopy and electron-microscopy, and the processing parameters to get better mechanical properties were obtained.The effects of microstructures on mechanical and corrosion properties were also studied and suitable methods were adopted to improve the surface quality of the aluminum substrate plate.The main conclusions from experiments can be drawn as follows:(1)The content of Mg in 1052 is larger than that in 1050 alloy,which can restrains grains in the alloys from growing and then increase the recrystallization temperature. Hence,the grain size of 1052 alloy is smaller than that of 1050 alloy,benefiting to improve the mechanical and corrosion properties of the former alloy.At the same time, a larger mount of Mg content with oxide MgO distributed on the surfaces of 1052 alloy plate is beneficial to increasing its corrosion properties.(2)Given that the samples are hot-rolled at 470℃and intermediate-annealed at 420℃for 1h,the mechanical properties are mainly determined by the cold-rolling reduction.While for the samples without intermediate-annealing treatment,their mechanical properties are determined by both hot rolling and cold rolling reductions. The sample with 85%cold-rolling reduction and without intermediate-annealing treatment has the highest hardness.However,the sample with 90%cold-rolling reduction with intermediate-annealing treatment possesses the highest hardness.And at the same time,its mechanical and corrosion properties are better than those of the sample without intermediate-arinealing treatment.(3)The sample hot rolled at 380℃with deformation reduction 88%,intermediate annealed at 38℃for 1h and cold rolled with deformation reduction 85%has the best mechanical properties(namely,yield strength 206MPa,tensile strength 209.7MPa and elongation to failure 3.4%,and the average grain size is about 15.1μm..Under 2.5 percent of(volume fraction) of Hcl aqueous solution,the corrosion current density is 4.021E-5 A/cm~2,corrosion potential is -0.7358 V,respectively,and the corrosion cavity is fine and uniform.(4)A large amount of dislocations are generated during rolling,and the substructure formed by dislocations is fine.The dynamic recrystallization during hot rolling and the followed intermediate annealing can refine,gains.The grain size of the alloy can be refined from 210 to 15.1μm through the current preparation technologies,and the microhardness of the alloy becomes higher with smaller grain size.