【摘要】 采用纳秒脉冲激光修复技术，对6061铝合金受损表面进行修复.通过SEM、EDS分析不同参数的激光扫描速度、频率及光斑搭接率，对修复效果及表面形貌的影响.结果表明，提升激光扫描速度通过缩短热作用时间，有效抑制熔池热累积与材料烧蚀，显著优化表面平整度并减少球状缺陷；提升重复频率通过降低单脉冲能量，抑制材料过度去除并促进熔体重构，实现表面平整化；适度提升搭接率促进熔体流动与均匀凝固，优化表面平整度及形成规则块状结构；过高搭接率则因能量集中诱发烧蚀与快速凝固，导致沟槽、边界堆积及密集团簇粗化；激光处理实现表面净化，并特征性流失低沸点Mg元素，氧动态平衡反映氧化层重构，碳稳定性排除外源污染.更多还原

【Abstract】 This paper employed nanosecond pulsed laser restoration technology to repair damaged surfaces of 6061 aluminum alloy. The effects of laser scanning speed, repetition frequency, and spot overlap rate on restoration efficacy and surface morphology were systematically investigated through SEM and EDS analyses. The key findings demonstrated thatincreased scanning speed shortened thermal exposure, effectively suppressed melt pool heat accumulation and material ablation, thereby optimizing surface flatness while reducing spherical defects; elevated repetition frequency reduced pulse energy, inhibited excessive material removal, and promoted melt reorganization to achieve surface planarization; a moderate overlap rate enhanced melt flow and uniform solidification, improved surface regularity, and formed ordered blocky structures, whereas excessive overlap concentrated energy, induced ablation/rapid solidification, and caused grooves, boundary accumulation, and coarse clustered aggregates; and laser treatment enabled surface purification, as evidenced by an enhanced Al signal, accompanied by characteristic Mg depletion via evaporation/oxidation, while oxygen equilibrium confirmed oxide layer reconstruction and carbon stability excluded exogenous contamination.更多还原