Effect of laser energy density on surface physical characteristics and corrosion resistance of 7075 aluminum alloy in laser cleaning

2022 ◽  
Vol 148 ◽  
pp. 107742
Author(s):  
Wei Wang ◽  
Jie Shen ◽  
Weijun Liu ◽  
Hongyou Bian ◽  
Qiang Li
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Energy Density ◽  
Laser Energy ◽  
Laser Cleaning ◽  
Physical Characteristics ◽  
Laser Energy Density ◽  
7075 Aluminum Alloy

Effect of different laser energy densities on the corrosion resistance of aluminum alloys

2020 ◽  
Vol 67 (5) ◽  
pp. 437-444
Author(s):  
Di Xie ◽  
Hui Chen ◽  
Siyi Yin ◽  
Feisen Wang ◽  
Jingwen Chen ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Aluminum Alloy ◽  
Aluminum Alloys ◽  
Energy Density ◽  
Surface Cleaning ◽  
Laser Cleaning ◽  
Chemical Cleaning ◽  
Content Type ◽  
Cleaning Equipment ◽  
Surface Laser

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.

Removal characteristics of shop-primer paint by laser energy density in Q-switching fiber laser cleaning

2020 ◽  
Vol 34 (07n09) ◽  
pp. 2040042
Author(s):  
Ji-Eon Kim ◽  
Myoung-Soo Han ◽  
Jong-Do Kim
Keyword(s):  
Energy Density ◽  
Fiber Laser ◽  
Oxide Layer ◽  
Base Metal ◽  
Steel Surface ◽  
Laser Energy ◽  
Laser Cleaning ◽  
Low Energy ◽  
Laser Energy Density ◽  
Q Switching

In this study, we performed laser cleaning using a Q-switching fiber laser to remove the shop-primer paint and the oxide layer. An analysis of the surface cleaned by laser was carried out at various energy densities. The results showed that the oxide layer on the steel surface was not removed at a relatively low energy density, whereas the base metal was damaged under excessive energy density. We confirmed that it was essential to select an appropriate energy density for efficiently removing only the paint and the oxide layer without damaging the base metal in laser cleaning.

scholarly journals Properties of Jet-Plated Ni Coating on Ti Alloy (Ti6Al4V) with Laser Cleaning Pretreatment

Metals ◽  
2019 ◽  
Vol 9 (2) ◽  
pp. 248
Author(s):  
Xiao Wang ◽  
Mingyang Xu ◽  
Zhanwen Wang ◽  
Lida Shen ◽  
Mingbo Qiu ◽  
...  
Keyword(s):  
Wear Resistance ◽  
Titanium Alloy ◽  
Energy Density ◽  
Oxide Layer ◽  
High Efficiency ◽  
Laser Energy ◽  
Laser Cleaning ◽  
Laser Energy Density ◽  
Wear Volume ◽  
Jet Electrodeposition

The surface mechanical properties of the Selective Laser Melting (SLM) formed Ti6Al4V samples were improved by adopting a novel laser cleaning pretreatment process combined with a jet electrodeposition process. This paper aimed to investigate the effects of different laser powers on the morphologies and adhesions of the nickel coatings. The advantages of the laser cleaning process are no grinding, no contact, high efficiency and environmental protection. The morphologies, adhesion, wear resistance, and hardness of the coatings were characterized. The results indicate that when the laser energy density reached 20% (4 J/cm2), the contaminations on the substrate and the oxide layer were removed and the crystalline grain of the coating was 15.3 nm. The shallow pits generated by laser burning increased the adhesion of the coatings. In addition, when the laser energy density increased to 6 J/cm2, a yellow oxide layer was produced on the surface of the cleaned titanium alloy. Moreover, the wear resistance of the titanium alloy after the nickel plating was improved. The wear volume was only 0.046 mm3, and the hardness increased to 1967.6 N/mm2.

scholarly journals Research on mechanism and process of paint removal with pulsed fiber laser

2018 ◽  
Vol 189 ◽  
pp. 01008
Author(s):  
Xiaodi Zeng ◽  
Wenbin Qin ◽  
Jing Li ◽  
Zhiyong Wang
Keyword(s):  
Energy Density ◽  
Fiber Laser ◽  
Laser Energy ◽  
Steel Substrate ◽  
Paint Layer ◽  
Laser Cleaning ◽  
Laser Energy Density ◽  
Cleaning Efficiency ◽  
Pulsed Fiber Laser ◽  
Paint Removal

Compared with the traditional cleaning technology, laser cleaning, as a new type of industrial technology, has the advantages of high cleaning rate, green pollution-free and low cost. So laser cleaning is widely used in the fields of paint removal. This paper analyzes that the mechanism of paint removal and heat transfer process in the paint layer and substrate, also determines the process parameters of affect the laser paint removal. The removal of paint from steel substrate with fiber laser of frequency adjustable 20 to 500kHz at 1064nm is reported, researching impact that laser energy density,scanning speed and line width on the paint removal effect. The results show that, the 100μm paint layer can be removed completely while keeping the substrate undamaged with the laser energy density of 10.19J/cm2 and speed of 4200mm/s and width of 0.02mm. In order to get better results, the cleaning efficiency can be improved by increasing the power, speed and spot size under the right energy density.

scholarly journals Preliminary Laser Cleaning Studies of a Consolidated Prehistoric Basketry Coming from the Pile Building of Fiavè-Carera in the North-East of Italy

2006 ◽  
Vol 2006 ◽  
pp. 1-5 ◽  
Author(s):  
Romina Belli ◽  
Antonio Miotello ◽  
Paolo Mosaner ◽  
Laura Toniutti ◽  
Marta Bazzanella
Keyword(s):  
Energy Density ◽  
Material Removal ◽  
Laser Energy ◽  
Laser Cleaning ◽  
Original Surface ◽  
North East ◽  
The North ◽  
Cleaning Procedures ◽  
Krf Excimer Laser ◽  
Organic Deposits

In the archaeological field, some specific advantages are recognized to laser cleaning, like, for example, the absence of mechanical contacts with the sample. The cleaning procedures generally involve a multilayer structure (dust, dirty, organic deposits, and, in some cases, consolidant substances). In this work, prehistoric wood samples (found and consolidated in 1970s) have been laser irradiated (KrF excimer laser) in order to restore their original surface aspect. A certain amount of burned matter was also present. Samples came from a fragment of a prehistoric basketry found in the lake dwelling site of Fiavè-Carera, Trento, Italy (1500–1400 BC). It was observed that the laser cleaning effects are strictly dependent on the irradiation parameters (power density and number of pulses). Efficient material removal was possible by using appropriate energy density. Moreover, for lower laser energy density, special structures appeared on the surface of the consolidating substance that we attributed to heating-induced stresses on the consolidant surface.

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