ABSTRACT

Oxide films for Al–Mg–Si alloys with various aluminium oxide contents from 65.99 to 80.97% and thicknesses ranging from 1.7 to 5.1 μm were obtained. The effect of the oxidation reaction interface on the accelerated corrosion behaviour of Al–Mg–Si alloy has been investigated by using scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS), electron probe microanalyzer (EPMA), accelerated corrosion tests and electrochemical tests. Accelerated corrosion tests indicated that incomplete oxide films reduced the corrosion resistance even with increasing oxide film thickness and Al₂O₃ content in a solution containing 30 g L⁻¹ NaCl and 10 mL HCl (ρ = 1.19 g mL⁻¹). The thicker oxide film effectively inhibited corrosion behaviour, while the thinner oxide film disappeared and its substrate suffered corrosion after immersion for 6 h, corresponding to the dissolution of oxide film and shedding of second-phase practices on interfaces. Accelerated corrosion response of various oxidation reaction interfaces was built by an equivalent electrochemical circuit.

摘要

获得了各种氧化铝含量为 65.99 至 80.97% 且厚度范围为 1.7 至 5.1 μm 的 Al-Mg-Si 合金的氧化膜。采用扫描电子显微镜（SEM）、X射线光电子能谱（XPS）、电子探针显微分析仪（EPMA）、加速腐蚀试验研究了氧化反应界面对Al-Mg-Si合金加速腐蚀行为的影响。和电化学测试。加速腐蚀试验表明，在含有 30 g L _{-1 NaCl}和10 mL HCl ( ρ ⁼  1.19 g mL ^-1）。较厚的氧化膜有效地抑制了腐蚀行为，而较薄的氧化膜在浸泡6 h后消失，其基体遭受腐蚀，对应于氧化膜的溶解和界面上第二相实践的脱落。通过等效电化学电路构建了各种氧化反应界面的加速腐蚀响应。