Nb微合金化对低合金高强钢耐海水腐蚀性能的影响  

Effect of Nb microalloying on the corrosion resistance of high-strength low-alloy steel to seawater

作　　者：聂中萍 吴开明[1] 张弦 刘静[1] 马洪峰 赵华中 Nie Zhongping;Wu Kaiming;Zhang Xian;Liu Jing;Ma Hongfeng;Zhao Huazhong(International Research Institute for Steel Technology,Wuhan University of Science and Technology, Wuhan 430081,China;Wuhan Anchor Welding Consumables Co.,Ltd.,Wuhan 430085,China)

机构地区：[1]武汉科技大学国际钢铁研究院,湖北武汉430081 [2]武汉铁锚焊接材料股份有限公司,湖北武汉430085

出　　处：《武汉科技大学学报》2018年第2期94-98,共5页Journal of Wuhan University of Science and Technology

基　　金：国家重点基础研究发展计划(973计划)资助项目(2014CB643300);湖北省技术创新专项重大项目(2016AAA022)

摘　　要：利用室内模拟海水加速腐蚀试验及电化学分析,研究了Nb微合金化对Cu-Cr-Ni-P系低合金高强钢耐海水腐蚀性能的影响。结果表明,含Nb钢与不含Nb钢组织均由铁素体和珠光体构成,但Nb微合金化后钢中珠光体组织减少且晶粒细化明显,其在模拟海水介质中的平均腐蚀速率与不含Nb钢相比,降低了约12%,阳极腐蚀电流密度也有所降低。由此可见,在Cu-Cr-Ni-P系低合金高强钢中加入Nb元素有助于提高其耐海水腐蚀性能。By means of indoor accelerated corrosion test and electrochemical analysis,the effects of Nb microalloying on the seawater corrosion resistance of Cu-Cr-Ni-P based high-strength low-alloy steel were investigated.The results show that the microstrucutre of Nb-free steel and Nb-bearing steel are both ferrite and pearlite,but less amount of pearlite and finer grain size are observed in the Nb-bearing steel.Moreover,the average corrosion rate of the steel microalloyed with Nb under the simulated seawater medium is reduced by about 12%compared with the Nb-free steel,along with the reduction of anode corrosion current density.Thus,the addition of Nb element in the Cu-Cr-Ni-P based high-strength low-alloy steel is beneficial to improving the seawater corrosion resistance.

关 键 词：NB微合金化 低合金高强钢 海水腐蚀 电化学性能 晶粒细化 

分 类 号：TG172.5[金属学及工艺—金属表面处理]