Fe20Cr9Ni奥氏体-铁素体不锈钢热老化后的点蚀性能  

Pitting corrosion resistance of thermally-aged Fe20Cr9Ni austenite-ferrite stainless steel

作　　者：董芳 张泽丰 杨滨 DONG Fang;ZHANG Zefeng;YANG Bin(Collaborative Innovation Center of Steel Technology,University of Science and Technology Beijing,Beijing 100083,China;China National Nuclear Supply Chain Operation Co.Ltd.,Shanghai 200233,China)

机构地区：[1]北京科技大学钢铁共性技术协同创新中心,北京100083 [2]中核(上海)供应链管理有限公司,上海200233

出　　处：《南昌工程学院学报》2023年第3期60-64,94,共6页Journal of Nanchang Institute of Technology

基　　金：国家863计划重大项目(2012AA03A507);国家863计划重点项目(2008AA031702);北京市自然科学基金资助项目(216206)。

摘　　要：奥氏体-铁素体双相不锈钢因力学、耐腐蚀以及焊接性能优良而广泛应用于油气、化工、食品、电力、交通运输和造纸行业中。采用电化学腐蚀试验研究了奥氏体-铁素体不锈钢在400℃温度下热老化不同时间的点蚀性能。结果表明,随着热老化时间延长,Fe20Cr9Ni奥氏体-铁素体不锈钢耐点蚀性能降低,表现为维钝电流(I_(0))增大,击破电位(E_(b))和钝化膜电阻降低。电化学测试结果表明,Fe20Cr9Ni奥氏体-铁素体不锈钢在10000 h内随热老化时间延长耐点蚀性能下降是由于铁素体相区内发生调幅分解所致。Among stainless steels,duplex stainless steels with austenitic and ferritic phases are widely used to the oil and gas,chemical,food,power,transportation,and paper industries due to their excellent mechanical properties,corrosion resistance,stress corrosion cracking resistance and weldability.The pitting corrosion resistance of Fe20Cr9Ni austenitic-ferritic stainless steel was reduced significantly with increasing aging time up to for 10000 h at 400℃.With the increase of aging time,the passive current(I_(0))increased,and the pitting potential(E_(b))as well as the passive film resistor declined,showing that spinodal decomposition was the primary reason to decline the pitting resistance of the Fe20Cr9Ni austenitic-ferritic stainless steel during its thermal aging process.

关 键 词：奥氏体-铁素体不锈钢 热老化 点蚀 调幅分解 

分 类 号：TL341[核科学技术—核技术及应用]