almgsicu合金强化工艺及耐腐蚀性能的分析word格式论文.docxVIP

··after double stage of solution will make the matrix grain coarsing in different degree due to long time high temperature, it makes the tensile strength and hardness of alloys decrease after taking single stage of artificial aging treatment, respectively, 280.3Mpa and 78.8HB; and the effects of special solution treatments on Al-Mg-Si-Cu alloys containing high amount of Cu are more obvious than the alloys containing low amount of Cu.In the same corrosion conditions, the most severe intergranular corrosion is the Al-Mg-Si-1.5Cu alloy that after taking the conventional solid solution treatment followed bysingle stage of artificial aging, more 91.9μm in depth compared to the alloy after taking hightemperature pre-precipitation; The most severe intergranular corrosion is the Al-Mg-Si-1.5Cu alloy that after taking the intensifying solution treatment followed by double stage of artificial aging,more 149.0μm in depth compared to the alloy after taking high temperature pre-precipitation; Thesubsequence (from deep to shallow) of intergranular corrosion of Al-Mg-Si-1.5Cu alloys that after taking different solution treatments followed by single stage of artificial aging treatment are Conventional solid solution, Intensifying solution, Double stage of solution,High temperature pre-precipitation; The subsequence (from deep to shallow) of intergranular corrosion of Al-Mg-Si-1.5Cu alloys that after taking different solution treatments followed by double stage of artificial aging treatment are Intensifying solution,Conventional solid solution, Double stage of solution,High temperature pre-precipitation.The corrosion potentials move towards the negative direction with the inceacing of Cu content after taking the conventional solid solution treatment followed by single stage of artificial aging, and the passivation region becomes narrower, and the corrosion current density is increased; For the alloys have the same content of Cu, the corrosion potential of the alloys that after taki