2219铝合金阳极氧化膜焊前激光清洗工艺研究
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摘要
采用激光清洗技术对2219铝合金硫酸阳极氧化膜进行清洗,研究了清洗速度对阳极氧化膜去除效果的影响;对清洗后的铝合金进行焊接试验,以验证焊前激光清洗工艺的可行性;最后分析了激光清洗阳极氧化膜的机理和特性。结果表明:2219铝合金在焊前通过激光清洗后可获得外观和内部质量良好的焊接接头;2219铝合金阳极氧化膜激光清洗速度的阈值为1079mm·min~(-1);激光清洗去除2219铝合金阳极氧化膜的机制主要为爆炸和气化,并存在部分弹性震动剥离机制。
The laser cleaning technology is utilized to clean anodic oxide film of 2219 aluminum alloy before welding and the effect of cleaning speed on removal effect is studied.In order to verify the feasibility of laser cleaning,we perform the welding experiments on the cleaned aluminum alloy.At last,the mechanism and characteristic of laser cleaning are analyzed.Results indicate that 2219 aluminum alloy can obtain good appearance and internal quality after laser cleaning.The laser cleaning rate threshold is 1079 mm·min~(-1).The main mechanisms of laser cleaning of 2219 aluminum alloy anodic oxide film are evaporation and explosion,and also accompany with some elastic vibration stripping.
The laser cleaning technology is utilized to clean anodic oxide film of 2219 aluminum alloy before welding and the effect of cleaning speed on removal effect is studied.In order to verify the feasibility of laser cleaning,we perform the welding experiments on the cleaned aluminum alloy.At last,the mechanism and characteristic of laser cleaning are analyzed.Results indicate that 2219 aluminum alloy can obtain good appearance and internal quality after laser cleaning.The laser cleaning rate threshold is 1079 mm·min~(-1).The main mechanisms of laser cleaning of 2219 aluminum alloy anodic oxide film are evaporation and explosion,and also accompany with some elastic vibration stripping.
引文
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[2]Asmus J F,Westlake D L,Newton H T.Laser technique for the divestment of a lost Leonardo da Vinci mural[J].Journal of Vacuum Science and Technology,1975,12(6):1352-1355.
[3]Schweizer G,Werner L.Industrial 2-kW TEA CO2laser for paint stripping of aircraft[J].Proceedings of SPIE,1995,2502:57-63.
[4]Koh Y,Sarady I.Removal of adhesives and coatings on iron artifacts using pulsed TEA CO2 and Nd…YAG-lasers[J].Proceedings of SPIE,2001,4402:46-54.
[5]Dimogerontakis T,Oltra R,Heintz O.Thermal oxidation induced during laser cleaning of an aluminum-magnesium alloy[J].Applied Physics A,2005,81(6):1173-1179.
[6]Kumar A,Gupta M C.Surface preparation of Ti-3Al-2.5Valloy tubes for welding using a fiber laser[J].Optics and Laser in Engineering,2009,47(11):1259-1265.
[7]Rechner R,Jansen I,Beyer E.Influence on the strength and aging resistance of aluminum joints by laser pre-treatment and surface modification[J].International Journal of Adhesion and Adhesives,2010,30(7):595-601.
[8]Alshaer A W,Li L,Mistry A.The effects of short pulse laser surface cleaning on porosity formation and reduction in laser welding of aluminum alloy for automotive component manufacture[J].Optics&Laser Technology,2014,64:162-171.
[9]Tong Y Q.Study on mechanism and application fundamentals of laser removal of metal oxides[D].Zhenjiang:Jiangsu University,2014.佟艳群.激光去除金属氧化物的机理与应用基础研究[D].镇江:江苏大学,2014.
[10]Ke L D,Zhu H H,Lei W J,et al.Laser cleaning of rust on ship steel using TEA CO2pulsed laser[J].Proceedings of SPIE,2009,7515:75150G.
[11]Wang Z M,Zeng X Y,Huang W L.Parameters and surface performance of laser removal of rust layer on A3steel[J].Surface and Coatings Technology,2003,166(1):10-16.
[12]Chen Y M,Zhou L Z,Yan F,et al.Mechanism and quality evaluation of laser cleaning of aluminum alloy[J].Chinese Journal of Lasers,2017,44(12):1202005.陈一鸣,周龙早,闫飞,等.铝合金激光清洗机理与质量评估[J].中国激光,2017,44(12):1202005.
[13]Dong S Y,Song C Q,Yan S X,et al.Effect of laser cleaning pretreatment on laser welding formation of7A52aluminum alloy[J].Journal of Academy of Armored Force Engineering,2017,31(4):100-105.董世运,宋超群,闫世兴,等.激光清洗预处理对7A52铝合金激光焊缝成形质量的影响[J].装甲兵工程学院学报,2017,31(4):100-105.
[14]Keller F,Hunter M S,Robinson D L.Structural features of oxide coatings on aluminum[J].Journal of the Electrochemical Society,1954,101(6):411-419.
[15]Steen W M,Mazumder J.Laser Cleaning[M].London:Springer,2010:417-440.