304不锈钢在不同温度硝酸熔盐中的腐蚀行为  

Corrosion Behavior of 304 Stainless Steel in Molten Nitrate Salt at Different Temperatures

作　　者：周才正 洛桑 孙延虎 张学文 唐建群[2] 巩建鸣[2] ZHOU Caizheng;LUO Sang;SUN Yanhu;ZHANG Xuewen;TANG Jianqun;GONG Jianming(Huanghe Hydropower Development Co.,Ltd.,Xining 810008,China;Key Lab of Design and Manufacture of Extreme Pressure Equipment, School of Mechanical and Power Engineering, Nanjing Tech University, Nanjing 211816,China)

机构地区：[1]黄河上游水电开发有限责任公司,西宁810008 [2]南京工业大学机械与动力工程学院极端承压装备设计与制造重点实验室,南京211816

出　　处：《机械工程材料》2019年第5期68-70,78,共4页Materials For Mechanical Engineering

摘　　要：采用腐蚀动力学方法,结合腐蚀表面形貌观察和微区成分分析,研究了304不锈钢在不同温度(400,450,500,565℃)60%NaNO_3+40%KNO_3(质量分数)熔盐中的腐蚀行为。结果表明:试验钢在该熔盐中的腐蚀速率随着温度升高而增大,在565℃下的腐蚀速率达到99.6×10^(-5 )mg·cm^(-2)·h^(-1);在400℃下试验钢表面只有极少量氧化腐蚀产物,在450℃和500℃下表面生成少量的Fe_2O_3,在565℃下表面形成以Fe_2O_3和(Fe,Cr)_3O_4为主的氧化腐蚀产物;随着温度升高,试验钢表面Fe_2O_3含量增加,氧化腐蚀程度加重。Corrosion behavior of 304 stainless steel in molten salt at different temperatures(400,450,500,565℃) was studied by corrosion kinetic method,corrosion surface observation and micro area composition analysis;the molten salt was composed of 60wt%NaNO3+40wt%KNO3.The results show that the corrosion rate of the tested steel in the molten salt increased with the increase of temperature,and reached 99.6×10-5 mg·cm-2·h-1 at 565℃.There was only few oxidation corrosion products on the surface of the tested steel at 400℃.There was a small amount of Fe2O3 on the surface at 450℃ and 500℃.The oxidation corrosion products mainly content of Fe2O3 and(Fe,Cr)3O4 were formed on the surface at 565℃,with the increase of temperature,the content of Fe2O3 increased considerably and the oxidation corrosion degree aggravated.

关 键 词：304不锈钢 熔盐腐蚀 腐蚀动力学 硝酸盐 

分 类 号：TG172.9[金属学及工艺—金属表面处理]