Adhesion of Residual Primer Paint After Laser Cleaning Aircraft Aluminum Alloy Skin

Fig. 5. Residual primer paint after cleaning with plan 1.（a） Macro surface morphology ；（b） three-dimensional synthetic surface morphology；（c） surface roughness of the paint

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Fig. 6. Surface appearances of residual primer paint after cleaning with plan 2

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Table 1. Thermophysical properties of resin base paint
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Table 1. Thermophysical properties of resin base paint
Density ρ /(10³kg·m^-3） Thermal conductivity λ /（W·m^-1·K^-1）
Specific heat capacity c /
（10³J·kg^-1·K^-1）
Boiling point t /℃ Absorption coefficient β
1.45 0.3 2.5 ＞300 0.3

Table 2. Technical parameters of laser cleaning test
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Table 2. Technical parameters of laser cleaning test
Plan Sample Laser power P /W Scanning speed v /(mm·s^-1） Clean method
1 1# 500 12‒28 Clean the finish and keep the primer paint
2 2# 500 16 Cleaning step by step

Table 3. Statistical table of actual adhesion of test plan 1

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Table 3. Statistical table of actual adhesion of test plan 1

Process	Power P /W	Scanning speed v /（mm·s^-1）	Residual paint thickness ξ /μm	Average drawing force F /MPa
Original			28.3	2.5
1-①	500	28	26.1	2.4
1-②	500	24	22.3	2.6
1-③	500	20	24.5	2.3
1-④	500	16	27.8	2.2
1-⑤	500	12	23.6	2.7

Table 4. Statistical table of actual adhesion of test plan 2

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Table 4. Statistical table of actual adhesion of test plan 2

Process	Power P /W	Scanning speed v /（mm·s^-1）	Residual paint thickness ξ /μm	Average drawing force F /MPa
Original			123.3	2.4
2-①	500	16	95.7	2.6
2-②	500	16	78.2	2.7
2-③	500	16	57.5	2.2
2-④	500	16	32.4	2.3
2-⑤	500	16	11.2	1.1

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Kun Gao, Quansheng Zeng, Zhiyan Zhang, Xuechun Lin. Adhesion of Residual Primer Paint After Laser Cleaning Aircraft Aluminum Alloy Skin[J]. Laser & Optoelectronics Progress, 2021, 58(9): 0914006

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