Purpose

The purpose of this paper is to promote the corrosion resistance of the 5083-111H aluminum alloy by laser cleaning.

Design/methodology/approach

Laser with 2 ns pulse width was adopted in this project and the corrosion resistance of cleaned samples was tested by copper-accelerated salt spray (CASS). The surface morphology, elemental composition and distribution were then characterized by SEM. Moreover, surface morphology, elemental composition and distribution were also tested.

Findings

Results suggested a higher corrosion resistance was successfully obtained by laser cleaning. Compared with samples cleaned by 2000 grit sandpaper, mechanical cleaning resulted in a 53% larger height difference between the peak and valley. The content of the oxygen is 8.85% on the surface cleaned mechanically and the distribution is dependent on the distribution of aluminum whereas that of the laser cleaning sample is 24.41% and the distribution existed even in the Al-poor area.

Originality/value

In this project, the 2-ns laser cleaning was proved to have the capability to remove the oxide layer on the aluminum alloy surface while retaining an excellent corrosion resistance and smooth surface. Meanwhile, a thorough elemental distribution and smaller grain size lead to a smaller difference in elemental concentration. This retards the diffusion of oxygen into the substrate and hence increases the corrosion resistance of the surface.

中文翻译：

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窄脉宽激光清洗对A5083-H111铝合金耐腐蚀性能的影响

目的

本文旨在通过激光清洗提高5083-111H铝合金的耐腐蚀性能。

设计/方法/方法

该项目采用脉冲宽度为2 ns的激光，并通过铜加速盐雾（CASS）测试清洁样品的耐腐蚀性。然后通过SEM表征表面形态、元素组成和分布。此外，还测试了表面形态、元素组成和分布。

发现

结果表明，通过激光清洗成功地获得了更高的耐腐蚀性。与使用 2000 号砂纸清洁的样品相比，机械清洁导致峰谷之间的高度差增加了 53%。机械清洗表面的氧含量为 8.85%，分布取决于铝的分布，而激光清洗样品的氧含量为 24.41%，即使在贫铝区域也存在分布。

原创性/价值

在该项目中，2ns激光清洗被证明具有去除铝合金表面氧化层的能力，同时保持优异的耐腐蚀性和光滑的表面。同时，元素分布更彻底，晶粒尺寸更小，导致元素浓度差异更小。这会阻止氧气扩散到基材中，从而提高表面的耐腐蚀性。