A characterization of laser cleaning painting layer from steel surface based on thermodynamic model

Abstract

In this study, the environmentally friendly nanosecond ultraviolet (UV) laser is innovatively employed laser cleaning to remove the painting layer from the AH36 steel substrate. The feasibility of UV laser cleaning the painting layer is innovatively proposed and it has been calculated by the model theoretically, followed by elaborating the prominent interaction mechanism of UV laser exactly. The initial cleaning threshold and completely cleaning threshold are 2 J/cm 2 and 5 J/cm 2 , respectively. Afterwards, the UV laser cleaned surface quality is evaluated by the scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS), optical microscopy (OM) and optical profiler (OP), respectively. The mechanical properties have enhanced dramatically after laser cleaning and characterized by the Vickers hardness tester and universal testing machine. By varying laser fluences (2, 5, 7 J/cm 2 ) during laser cleaning, microstructures registering various sizes of corrugated shaped, craters and ring-shaped could be acquired. In addition, the mechanical properties analysis including rapid melting, quenching and dislocation density effects illustrates that laser cleaning could effectively increase surface microhardness, tensile strength and bending strength. Thus, laser cleaning method has emerged as a favourable means to strip painting layer in lieu of traditional methods for marine industry as well as this study could promote the development of laser cleaning in the field of marine engineering.

Cost-effective equipment for surface pre-treatment for cleaning and excitation of substrates in semiconductor technology

“…In addition to these solvent-based cleaning methods, there are also a variety of dry-cleaning methods. The best-known dry methods include mechanical cleaning, plasma cleaning, laser cleaning, dry ice cleaning, jet cleaning and UV/O 3 cleaning processes [3,[15][16][17][18][19][20]. In general, drycleaning processes often have the advantage of safety and environmental friendliness.…”

激光清洗技术研究进展及挑战

“…Fig. 2 Cleaning methods and removal mechanisms for surface contaminants on typical components [25][26][27][28][29][30][31][32][33][34][35] 0402201 -4 3 Laser cleaning effect and mechanisms of oxide film on surface of aviation titanium alloy inlet [25][26][27] 4 Laser cleaning effect and mechanisms of paint on highspeed aluminum alloy car body surface [28][29] . (a) Surface morphologies after aluminum alloy cleaning; (b) main mechanism of laser dry cleaning of blue/red paint on aluminum alloy surface…”

“…Effect and mechanisms of laser cleaning of rust on high strength steel hull surface [30][31][32] . (a) Surface morphologies of high strength steel after cleaning; (b) main mechanisms of laser dry/wet cleaning of surface rust on high strength steel hull…”