This paper investigates the corrosion of shot peened AA7075 aluminium alloys aged at different temperatures. The surface integrity of the hardened layer was evaluated with SEM, EDS, differential scanning calorimetry, hardness, and roughness measurements, and in the end also with corrosion resistance tests. The research results indicated that there were significant differences in precipitates distribution between aluminium alloys artificially aged at different temperatures. As the ageing temperature increases, the microhardness decreases, which influences the final roughness condition of the surface layer after shot peening. The results of potentiodynamic polarisation tests indicate that shot peening enables shifting the pitting potential to positive values, which ensures slightly higher corrosion resistance. SEM images confirmed the dissolution of the aluminium matrix near the separated iron-rich phases of the Al_x form (Fe, Mn) by the action of galvanic cells.

中文翻译：

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喷丸强化和人工时效铝合金7075对腐蚀行为的影响

本文研究了喷丸处理的AA7075铝合金在不同温度下时效的腐蚀情况。硬化层的表面完整性通过 SEM、EDS、差示扫描量热法、硬度和粗糙度测量进行评估，最后还进行了耐腐蚀性测试。研究结果表明，不同温度下人工时效铝合金的析出物分布存在显着差异。随着时效温度的升高，显微硬度降低，影响喷丸后表面层的最终粗糙度。动电位极化测试的结果表明，喷丸可以使点蚀电位变为正值，从而确保稍高的耐腐蚀性。_x通过原电池的作用形成 (Fe, Mn)。