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Experimental Validation of Long Term Thermal Exposure Sensitization of AA5xxx Alloys

机译：AA5xxx合金长期热敏化的实验验证

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In the present work, P-phase formation along grain boundaries has been evaluated by scanning transmission electron microscopy (STEM) and energy-dispersive X-ray spectroscopy (EDS) analysis methods. The thickness of β-phase along grain boundaries, measured by STEM for a 1-year thermally treated sample, was estimated to be 15 - 20 nm. Etching effects of phosphoric acid solution and ammonium persulfate solution on the Al matrix are discussed. The effect of ASTM G67 nitric acid attack on different surfaces was investigated. Mass loss data was collected for several AA5xxx alloys using long-term (~ 12 months), constant temperature (40 to 70°C) exposure tests. Other samples were treated in thermal exposure furnaces with cyclic temperatures (40 to 45°C and 50 to 70°C) to represent the heating cycles in service conditions.
机译：在目前的工作中，已经通过扫描透射电子显微镜（STEM）和能量色散X射线光谱（EDS）分析方法评估了沿晶界的P相形成。通过STEM对1年热处理的样品测得的沿晶界的β相厚度估计为15-20 nm。讨论了磷酸溶液和过硫酸铵溶液对Al基体的刻蚀效应。研究了ASTM G67硝酸对不同表面的侵蚀作用。使用长期（约12个月），恒温（40至70°C）暴露测试，收集了几种AA5xxx合金的质量损失数据。其他样品在热暴露炉中以循环温度（40至45°C和50至70°C）进行处理，以表示使用条件下的加热周期。

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