<p>Laser cleaning is one of the most efficient and environment-friendly rust cleaning methods. The removal of the corrosion layer from steel surfaces by nanosecond pulsed lasers usually causes discolouration of the surface. By proper selection of laser parameters, this discolouration can be avoided without compromising the material removal rate. In this work, a study on the treatment combination of laser power, scan speed, pulse repetition rate, and hatch distance on the colour of the laser-cleaned surface and the material removal rate is conducted via response surface methodology using a central composite design. The factors and interactions that significantly affect the response were identified by ANOVA. The model was experimentally validated and the parameter combination that gives the highest material removal rates with a shiny surface was identified with <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40516_2025_282_Article_IEq1.gif" Format="GIF" Height="6" Rendition="HTML" Resolution="72" Type="Linedraw" Width="17" /> </InlineMediaObject> <EquationSource Format="TEX">$\sim $</EquationSource> <EquationSource Format="MATHML"><math> <mo>∼</mo> </math></EquationSource> </InlineEquation> 90 % accuracy. The model suggests that the laser power and hatch distance have a stronger effect on material removal rate compared to scan speed and pulse repetition rate. The material removal rate varies from 0.1 mm<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40516_2025_282_Article_IEq2.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">$^3$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>3</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>/s to 0.4 mm<InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40516_2025_282_Article_IEq3.gif" Format="GIF" Height="10" Rendition="HTML" Resolution="72" Type="Linedraw" Width="8" /> </InlineMediaObject> <EquationSource Format="TEX">$^3$</EquationSource> <EquationSource Format="MATHML"><math> <mmultiscripts> <mrow /> <mrow /> <mn>3</mn> </mmultiscripts> </math></EquationSource> </InlineEquation>/s in the current range of parameters. The maximum material removal is observed to be at laser power between 7.5 - 10 W and hatch distance between 45-50 <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="40516_2025_282_Article_IEq4.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="12" /> </InlineMediaObject> <EquationSource Format="TEX">$\upmu $</EquationSource> <EquationSource Format="MATHML"><math> <mi mathvariant="normal">μ</mi> </math></EquationSource> </InlineEquation>m when the scan speed is 875 mm/s and PRR is 50 kHz. However, the feasible region that can create a surface with the same metallic colour as a polished steel surface is extremely narrow when compared to the full range of the parameters used in the study.</p>

Optimization of Nanosecond Pulsed Laser Cleaning of Rust

期刊论文
发表日期：

2025年2月14日

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Vishnu Narayanan,
Ramesh Singh,
Deepak Marla

摘要

Laser cleaning is one of the most efficient and environment-friendly rust cleaning methods. The removal of the corrosion layer from steel surfaces by nanosecond pulsed lasers usually causes discolouration of the surface. By proper selection of laser parameters, this discolouration can be avoided without compromising the material removal rate. In this work, a study on the treatment combination of laser power, scan speed, pulse repetition rate, and hatch distance on the colour of the laser-cleaned surface and the material removal rate is conducted via response surface methodology using a central composite design. The factors and interactions that significantly affect the response were identified by ANOVA. The model was experimentally validated and the parameter combination that gives the highest material removal rates with a shiny surface was identified with $\sim $ $\sim$ 90 % accuracy. The model suggests that the laser power and hatch distance have a stronger effect on material removal rate compared to scan speed and pulse repetition rate. The material removal rate varies from 0.1 mm $^3$ $^{3}$ /s to 0.4 mm $^3$ $^{3}$ /s in the current range of parameters. The maximum material removal is observed to be at laser power between 7.5 - 10 W and hatch distance between 45-50 $\upmu $ $μ$ m when the scan speed is 875 mm/s and PRR is 50 kHz. However, the feasible region that can create a surface with the same metallic colour as a polished steel surface is extremely narrow when compared to the full range of the parameters used in the study.