激光除锈工艺对EH36船用钢耐腐蚀性能的影响研究  

Effect of Laser Rust Removal Process on Corrosion Resistance of EH36 Marine Steel

作　　者：王志歆 杨振 上官剑锋 索旭升 沈新新 周虎 佟艳群[3] 袁爱华 Wang Zhixin;Yang Zhen;Shangguan Jianfeng;Suo Xusheng;Shen Xinxin;Zhou Hu;Tong Yanqun;Yuan Aihua(School of Environmental and Chemical Engineering,Jiangsu University of Science and Technology,Zhenjiang 212100,Jiangsu,China;Shanghai Waigaoqiao Shipbuilding Co.,Ltd.,Shanghai 200137,China;School of Mechanical Engineering,Jiangsu University,Zhenjiang 212013,Jiangsu,China)

机构地区：[1]江苏科技大学环境与化学工程学院,江苏镇江212100 [2]上海外高桥造船有限公司,上海200137 [3]江苏大学机械工程学院,江苏镇江212013

出　　处：《激光与光电子学进展》2023年第5期203-210,共8页Laser & Optoelectronics Progress

摘　　要：激光除锈是解决船用钢表面腐蚀的有效手段,激光除锈参数的不同会导致除锈效果和耐腐蚀性能的差别,因此有必要系统研究激光除锈后钢表面耐腐蚀性能的变化规律。本文以EH36船用钢为研究对象,研究激光能量密度和扫描速度等参数对耐腐蚀性能的影响,研究表面形貌和元素成分的变化,阐明激光参数对腐蚀性能的影响规律,在此基础上确定耐腐蚀性能最优的激光除锈工艺。研究表明:EH36钢的耐腐蚀性能随激光能量密度和扫描速度的增大呈现先提高后降低的趋势,在最优参数下钢表面的氧含量符合耐腐蚀要求。当激光能量密度为3.820 J/cm^(2)时,激光能量过量烧蚀基底,金属基底的晶粒尺寸变小、晶粒细化,晶界处活性位点密度变高,有利于金属的溶解,并降低了金属表面腐蚀产物的稳定性,从而降低耐腐蚀性能。在2.546 J/cm^(2)激光能量密度、3000 mm/s扫描速度下,EH36钢表面具有最优的耐腐蚀性,腐蚀电流密度比原始材料降低了57%。Laser rescaling is an effective way to reduce the surface corrosion of marine steel.The differences in laser rescaling parameters will result in differences in the descaling effect and corrosion performance.Therefore,it is necessary to examine the change in the corrosion performance after laser rescaling.This study used EH36 marine steel as the research object and examined the influence of parameters,such as laser energy density and scanning speed,on the corrosion resistance and changes in surface morphology and elemental composition.Additionally,the mechanism of the influence of laser parameters on corrosion performance was evaluated,and on this basis,the optimal laser rescaling process for corrosion resistance was determined.Results shows that the corrosion resistance of EH36 steel first increased and then decreased with the increase of laser energy density and scanning speed.The oxygen content of the surface met the corrosion resistance requirements under the optimal parameters.When the laser energy density was 3.820 J/cm^(2),the excessive laser energy ablated the substrate.The grain size of the metal substrate decreased.Grain refinement and the density of active sites at the grain boundaries became higher,which facilitated the dissolution of the metal and reduced the stability of the corrosion products on the metal surface,thereby reducing the corrosion resistance.The surface of EH36 steel treated with a laser energy density of 2.546 J/cm^(2) and scanning speed of 3000 mm/s exhibited optimal corrosion resistance,with a 57% decrease in corrosion current density compared to the original steel.

关 键 词：激光技术 激光除锈 耐腐蚀性能 船用钢板 表面形貌 

分 类 号：TN249[电子电信—物理电子学]