【摘要】 采用金相显微镜、电镜、慢应变拉伸、阳极极化及交流阻抗测试研究退火温度对淬火后冷轧5083铝合金耐蚀性的影响。研究结果表明:冷轧后在100℃和150℃退火40 min的5083铝合金仍呈变形组织特征,在局部变形区呈现连续分布的β相(Mg5Al8),合金具有较强应力腐蚀敏感性和较弱的耐点蚀能力;在200℃和250℃退火40 min后的合金,局部开始发生再结晶,但组织中仍包含由位错缠结而成的胞状亚组织,球状β相在晶内和晶界不连续分布,合金具有高的抗应力腐蚀和耐点蚀能力;在300℃和350℃退火40 min的5083铝合金,为完全再结晶组织,β相又趋于连续分布,合金抗应力腐蚀和耐点蚀能力变弱。更多还原

【Abstract】 Metallography,electron microscope,slow strain testing(SSRT),potentiodynamic polarization and electrochemical impedance spectroscopy(EIS) were used to study the effect of annealing temperature on the corrosion feature of cold-rolled 5083 aluminum alloy after quenching.It is supposed that the high stress corrosion cracking(SCC) susceptibility results from a continuous network of β-phase and along the planes of localized deformation in alloy annealed at 100 ℃ and 150 ℃ for 40 min.The high SCC resistance of the tested alloy annealed at 200 ℃ and 250 ℃ for 40 min is related to discontinuous β-phase precipitation uniformly distribute throughout the structure in a globular form due to plenty of dislocation combinated.In condition of annealing at 300 ℃ and 350 ℃ for 40 min,a continuous network of β-phase precipitates at boundaries because of the recrystal,and the stress corrosion resistance resistance and spot corrosion become weak again.更多还原