304不锈钢在不同温度硝酸熔盐中的腐蚀行为
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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%NaNO_3+40wt%KNO_3.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 Fe_2O_3 on the surface at 450℃ and 500℃.The oxidation corrosion products mainly content of Fe_2O_3 and(Fe,Cr)_3O_4 were formed on the surface at 565℃,with the increase of temperature,the content of Fe_2O_3 increased considerably and the oxidation corrosion degree aggravated.
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%NaNO_3+40wt%KNO_3.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 Fe_2O_3 on the surface at 450℃ and 500℃.The oxidation corrosion products mainly content of Fe_2O_3 and(Fe,Cr)_3O_4 were formed on the surface at 565℃,with the increase of temperature,the content of Fe_2O_3 increased considerably and the oxidation corrosion degree aggravated.
引文
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[3]ZHAO C Y,WU Z G.Thermal property characterization of a low melting-temperature ternary nitrate salt mixture for thermal energy storage systems[J].Solar Energy Materials and Solar Cells,2011,95(12):3341-3346.
[4]AHMED O,ZHOU L,MOHAJERI N,et al.Corrosion behaviour of AISI 304 stainless steel with solar salt heat transfer fluid[J].Advanced Materials Research,2014,922:13-17.
[5]DUNN R I,HEARPS P J,WRIGHT M N.Molten-salt power towers:Newly commercial concentrating solar storage[J].Proceedings of the IEEE,2012,100(2):504-515.
[6]SOLEIMANI DORCHEH A,DURHAM R N,GALETZ MC.Corrosion behavior of stainless and low-chromium steels and IN625in molten nitrate salts at 600℃[J].Solar Energy Materials and Solar Cells,2016,144:109-116.
[7]KRUIZENGA A,GILL D.Corrosion of iron stainless steels in molten nitrate salt[J].Energy Procedia,2014,49:878-887.
[8]FERNáNDEZ A G,LASANTA M I,PéREZ F J.Molten salt corrosion of stainless steels and low-Cr steel in CSP plants[J].Oxidation of Metals,2012,78(5/6):329-348.