疏浚用Q235钢和高锰钢冲刷腐蚀机理研究  

Erosion-corrosion Mechanism of Q235 Steel and High Manganese Steel for Dredging

作　　者：陈浩 李丹 刘永飞 姚海元 陈景杰[1] 徐云泽[1] CHEN Hao;LI Dan;LIU Yongfei;YAO Haiyuan;CHEN Jingjie;XU Yunze(School of Naval Architecture and Ocean Engineering,Dalian University of Technology,Dalian 116024,China;CNOOC Research Institute Co.,Ltd.,Beijing 100028,China)

机构地区：[1]大连理工大学船舶工程学院,辽宁大连116024 [2]中海油研究总院有限责任公司,北京100028

出　　处：《装备环境工程》2024年第7期132-139,共8页Equipment Environmental Engineering

基　　金：国家重点研发计划(2022YFC2806200)。

摘　　要：目的对比传统疏浚用Q235钢和新型高锰奥氏体钢的冲刷腐蚀行为,分析2种钢冲刷腐蚀耦合损伤机理。方法利用射流喷射装置分别对Q235钢和高锰钢的纯磨损和冲刷腐蚀行为进行研究,采用电化学阻抗和质量损失测量方法对冲刷腐蚀耦合分量进行解耦,最后结合形貌表征分析冲刷腐蚀耦合损伤机理。结果纯磨损结果显示,在高流速沙砾冲击下,Q235钢和高锰钢都有较高的损失,Q235钢的纯磨损速率是高锰钢的2倍。冲刷腐蚀结果显示,Q235钢冲刷腐蚀总损失速率大于高锰钢的2倍,2种钢的冲刷腐蚀损失中磨损都占据了主导地位,Q235钢腐蚀加速磨损速率占据总损失速率的25.9%,大于高锰钢所占比例18.3%。结论通过对比分析2种钢宏观和微观损伤形貌,发现虽然高锰钢的硬度远高于Q235钢,但其变形能力同样很高,这使得高锰钢拥有比Q235钢更优异的抗磨性能。此外,Cr和Al元素的添加也进一步提升了高锰钢的抗腐蚀性能,最终使得高锰钢的抗冲蚀性能也远优于Q235钢。The work aims to compare the erosion-corrosion behavior of Q235 steel and new high manganese austenitic steel for traditional dredging,and analyze the coupled damage mechanism of erosion-corrosion between the two steels.The pure ero-sion and erosion-corrosion behavior of Q235 steel and high manganese steel were studied with a jet spraying device.The cou-pling components of erosion-corrosion were decoupled by electrochemical impedance and weight loss measurement methods.Finally,the mechanism of erosion-corrosion coupling damage was analyzed through morphology characterization.The pure ero-sion results showed that both Q235 steel and high manganese steel had high losses under high flow velocity gravel impact,and the pure erosion rate of Q235 steel was twice that of high manganese steel.The results of erosion-corrosion showed that the total loss rate of Q235 steel was twice that of high manganese steel,and the erosion played a dominant role in the erosion-corrosion loss of both types of steel.The corrosion enhanced erosion rate of Q235 steel accounted for 25.9%of the total loss rate,which was higher than the proportion of high manganese steel at 18.3%.By comparing and analyzing the macroscopic and microscopic damage morphology of two types of steel,it is found that although the hardness of high manganese steel is much higher than that of Q235 steel,its deformation ability is also high,which makes high manganese steel have better erosion resistance than Q235 steel.In addition,the addition of Cr and Al elements further enhances the corrosion resistance of high manganese steel,ul-timately resulting in a much better erosion resistance than Q235 steel.

关 键 词：疏浚 Q235钢 高锰钢 纯磨损 冲刷腐蚀 协同作用 

分 类 号：TG172[金属学及工艺—金属表面处理]