摘要
为了探究钢筋石笼筋材在干湿循环盐环境中的抗腐蚀性能,采用干湿循环加速腐蚀试验,研究了HPB300普通钢、NH400耐候钢及NS142、NS3362种耐蚀钢在干湿循环盐雾[5%(质量分数)NaCl溶液]腐蚀环境下的失效行为。通过腐蚀失重法、XRD、SEM和电化学测试等方法研究了4种钢在干湿循环盐溶液介质中的腐蚀速率变化规律、物相、形貌结构及其电化学特性,对比分析了4种钢在模拟加速环境中的耐蚀性能及力学性能变化。结果表明:在5%NaCl溶液腐蚀介质中加速循环105周期后,HPB300钢和NH400钢的腐蚀速率显著高于NS142和NS336,且自腐蚀电位更负;经加速腐蚀试验后,HPB300钢的抗拉强度已经无法满足钢筋石笼筋材的应用要求,但NH400、NS142、NS336的抗拉强度仍满足服役条件。因此,NS142及NS3362种耐蚀钢更适合应用于盐雾腐蚀环境下钢筋石笼的筋材。
In order to investigate the corrosion resistance of reinforced gabion rebars in dry and wet cyclic salt environments,the failure behav-ior of HPB300 ordinary steel,NH400 weathering steel,NS142 and NS336 corrosion resistance steels in a dry and wet cyclic salt spray[5%(mass fraction)NaCl solution]corrosion environment was studied by dry and wet cyclic accelerated corrosion test.The changes in corrosion rate,phase,morphological structure and electrochemical properties of 4 types of steels in a dry wet cyclic salt solution medium were studied by corrosion weight loss method,XRD,SEM and electrochemical test,and the changes in corrosion resistance and mechanical properties of 4 types of steel in simulated accelerated environment were further compared and analyzed.Results showed that after 105 cycles of accelerated cyc-ling in 5%NaCl solution corrosion medium,the corrosion rates of HPB300 steel and NH400 steel were significantly higher than that of NS142 and NS336,and the self-corrosion potential was more negative.After accelerated corrosion test,the tensile strength of HPB300 steel could no longer meet the application requirements of reinforced gabion rebars,whereas the tensile strength of NH400,NS142 and NS336 still met the service conditions.Therefore,NS142 and NS336 corrosion resistant steel were more suitable for the application of reinforced gabion rebars in salt spray corrosion environment.
作者
韩晓亮
唐维斌
南雪丽
魏定邦
王海林
HAN Xiaoliang;TANG Weibin;NAN Xueli;WEI Dingbang;WANG Hailin(Lanzhou Highway Service Center,Lanzhou 730031,China;Center for High-Performance Materials Research and Development,Gansu Province Transportation Planning,Survey&Design Institute Co.,Ltd.,Lanzhou 730000,China;School of Materials Science and Engineering,Lanzhou University of Technology,Lanzhou 730050,China)
出处
《材料保护》
CAS
CSCD
2023年第7期98-104,共7页
Materials Protection
基金
甘肃省交通运输厅科研项目(2022-14)
2021年度省交通运输厅科技创新“揭榜挂帅”制项目(2021-02)资助。
关键词
钢筋石笼
干湿循环
盐雾腐蚀环境
耐蚀钢
耐候钢
reinforced gabions
dry and wet cycle
salt spray corrosion environment
corrosion resistant steel
weathering steel
