This study investigates the effect of artificial aging treatment and mechanical attrition treatment on the corrosion behavior of 6351 Al alloy in Red Sea environment. The artificial aging of the alloy is carried out at temperature range 140°C–240°C in steps of 20°C for various time periods after the solution heat treatment at 530°C for 1 hour. Based on the hardness measurements, the aged specimens are categorized into three, namely, underaged, peak aged, and overaged. The as received alloy specimens are subjected to mechanical attrition treatment in a vacuum chamber using steel balls. Vickers hardness test reveals that there is a remarkable improvement in hardness of mechanical attrition treated specimens compared to that of aged specimens. The aged and mechanical attrition treated specimens were subjected to the corrosion test in Red Sea water using the Autolab instrument. The corrosion tests reveal that the peak-aged composite corrodes more in Red Sea water when compared to that of other groups of specimens. XRD measurements and SEM analysis are carried out to study the surface nature of attrition treated specimens. It is observed that the mechanical attrition treated specimens exhibit a nanocrystalline surface and lead to a decrease in corrosion resistance. However, the annealing of the alloy after attrition treatment optimizes the mechanical and corrosion properties of the alloy.

中文翻译：

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热处理和机械处理对红海环境下6351铝合金近海腐蚀行为影响的研究

本研究探讨了人工时效处理和机械磨损处理对红海环境中6351铝合金腐蚀行为的影响。在530°C固溶热处理1小时后，在40°C至140°C–240°C的温度范围内以20°C的步长进行人工时效。根据硬度测量结果，将老化试样分为三类，即未老化，峰值老化和过老化。收到的合金试样在真空室内使用钢球进行机械磨损处理。维氏硬度测试表明，与老化试样相比，机械磨损处理过的试样的硬度有了显着提高。使用Autolab仪器在红海水中对经过老化和机械磨损处理的标本进行腐蚀测试。腐蚀测试表明，与其他组试样相比，在红海水中出现峰值时效的复合材料腐蚀更大。进行XRD测量和SEM分析以研究经过磨损处理的样品的表面性质。观察到，经机械磨损处理的样品表现出纳米晶表面，并导致耐腐蚀性降低。但是，在磨损处理之后对合金进行退火可以优化合金的机械性能和腐蚀性能。进行XRD测量和SEM分析以研究经过磨损处理的样品的表面性质。观察到，经机械磨损处理的样品表现出纳米晶表面，并导致耐腐蚀性降低。但是，在磨损处理之后对合金进行退火可以优化合金的机械性能和腐蚀性能。进行XRD测量和SEM分析以研究经过磨损处理的样品的表面性质。观察到，经机械磨损处理的样品表现出纳米晶表面，并导致耐腐蚀性降低。但是，在磨损处理之后对合金进行退火可以优化合金的机械性能和腐蚀性能。