Purpose

Laser cleaning, as a new type of cleaning technology, has the advantages of environment-friendliness, better selectivity, better controllability and higher efficiency compared to traditional chemical cleaning or grinding. This paper aims to use ultra-fast surface laser cleaning equipment built in laboratory to study the influence of different energy density (7.6, 11.5 and 15.3 J/cm²) on corrosion resistance of the aluminum alloy A7N01P-T4, a high-speed train body material.

Design/methodology/approach

SEM, white light interferometer, EDS and XPS were used to analyze the surface morphology, roughness, element content and oxide layer composition of aluminum alloy before and after cleaning. The corrosion resistance was studied by electrochemical experiments and exfoliation corrosion experiments.

Findings

The results showed that new oxide scale was formed on the surface after laser cleaning. The changes of surface roughness and chemical composition of oxide scale made a significant influence on corrosion behaviors. Better corrosion resistance was obtained with the energy density increased, and at the energy density of 11.5 J/cm², aluminum alloy exhibited the best corrosion resistance.

Research limitations/implications

The paper only studies specific aluminum alloys and is not universal. Laser cleaning equipment is set up for the laboratory and has not yet been put into industrial production.

Practical implications

This paper indicated that ultra-fast laser processing was a new direction for the development of industrial equipment surface cleaning and carried out ultra-fast laser of aluminum alloy surface cleaning had certain research significance for its corrosion resistance.

Social implications

Compared with the conventional cleaning methods such as air abrasives grinding or chemical cleaning, laser cleaning has advantages of environment-friendliness, better selectivity, better controllability and higher efficiency. Laser cleaning can not only protect the environment, but also improve cleaning efficiency.

Originality/value

Changes in the surface of aluminum alloys after ultra-fast surface laser treatment were found, and the mechanism of changes in aluminum alloy corrosion properties was clarified.

中文翻译：

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不同激光能量密度对铝合金耐蚀性的影响

目的

激光清洗作为一种新型的清洗技术，与传统的化学清洗或研磨相比，具有环保，选择性好，可控性强和效率高的优点。本文旨在使用实验室内置的超快表面激光清洗设备来研究不同能量密度（7.6、11.5和15.3 J / cm ²）对高速火车铝合金A7N01P-T4耐腐蚀性的影响主体材料。

设计/方法/方法

用SEM，白光干涉仪，EDS和XPS分析铝合金清洗前后的表面形貌，粗糙度，元素含量和氧化层组成。通过电化学实验和剥离腐蚀实验研究了耐腐蚀性。

发现

结果表明，激光清洗后在表面形成了新的氧化皮。表面粗糙度和氧化皮化学成分的变化对腐蚀行为有重要影响。随着能量密度的增加，获得了更好的耐腐蚀性，并且在11.5J / cm ²的能量密度下，铝合金表现出最佳的耐腐蚀性。

研究局限/意义

本文仅研究特定的铝合金，并不通用。激光清洁设备是为实验室设置的，尚未投入工业生产。

实际影响

指出超快激光加工是工业设备表面清洁发展的新方向，开展铝合金表面清洁的超快激光对其耐蚀性具有一定的研究意义。

社会影响

与传统的清洁方法如空气研磨剂或化学清洁相比，激光清洁具有环保，选择性好，可控性强和效率高的优点。激光清洁不仅可以保护环境，而且可以提高清洁效率。

创意/价值

发现了超快表面激光处理后铝合金表面的变化，并阐明了铝合金腐蚀性能变化的机理。