EH36钢激光清洗参数优化与表面性能评估

针对船舶舱内复杂空间材料表面除锈需求，利用脉冲光纤激光清洗平台开展了EH36船用钢板激光清洗工艺参数优化与清洗后材料表面性能实验研究。通过宏观、微观形貌观测与表面化学成分分析，并结合船舶行业除锈标准规范，建立了船用钢激光除锈质量评价准则，以此确定了材料激光除锈最佳工艺参数。在此基础上开展激光除锈后材料表面质量、显微硬度、粗糙度及综合力学性能测试评估。研究结果表明：在最佳除锈工艺参数(平均功率210 W、重复频率250 kHz、脉冲宽度300 ns、扫描速度4 000 mm/s)下，船用钢板表面质量达到Sa2.5等级，力学性能基本保持不变，能够满足船舶舱内复杂空间材料表面除锈工艺要求，在船舶修造材料表面除锈领域具有优良的适用性。

Optimization of laser cleaning parameters and evaluation of surface properties of EH36 steel

In order to meet the requirements of removing rust on the surface of complex space materials in ship cabins, this paper adopts the pulsed fiber laser cleaning platform to carry out the optimization of laser cleaning process parameters and the experimental study on the surface properties of EH36 Marine steel plate after cleaning. Based on the macroscopic and microscopic morphology observation and surface chemical composition analysis, and combined with the derusting standard specification of the shipbuilding industry, the quality evaluation criterion of Marine steel laser rust removal is established, and the optimal process parameters of material laser rust removal are determined. On this basis, the surface quality, microhardness, roughness and comprehensive mechanical properties of the materials after laser derusting are tested and evaluated. The results show that, under the optimal derusting process parameters (average power 210 W, repetition frequency 250 kHz, pulse width 300 ns, scanning speed 4000 mm/s), the surface quality of Marine steel plate can reach Sa2.5 grade, and the mechanical properties remain basically unchanged, which can meet the requirements of derusting process on the surface of complex space materials in ship hold. It has excellent applicability in the field of surface rust removal of shipbuilding materials.