304和316H不锈钢在LiF-NaF-KF熔盐中的腐蚀行为研究

doi:10.11902/1005.4537.2018.001

中国腐蚀与防护学报

2019, Vol. 39

Issue (1): 51-58 DOI: 10.11902/1005.4537.2018.001

研究报告

本期目录 | 过刊浏览

304和316H不锈钢在LiF-NaF-KF熔盐中的腐蚀行为研究

刘辉^1,²,邱玮¹(

),冷滨²(

),俞国军²

1. 长沙理工大学能源与动力工程学院长沙 410114
2. 中国科学院上海应用物理研究所上海 201800

Corrosion Behavior of 304 and 316H Stainless Steels in Molten LiF-NaF-KF

Hui LIU^1,²,Wei QIU¹(

),Bin LENG²(

),Guojun YU²

1. School of Energy and Power Engineering, Changsha University of Scinece & Technology, Changsha 410114, China
2. Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201800, China

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摘要:

通过静态腐蚀及SEM/EDS、EPMA等分析表征技术，研究了304和316H不锈钢在700 ℃ LiF-NaF-KF (FLiNaK) 熔盐中的腐蚀行为。结果表明，这两种不锈钢在FLiNaK熔盐中的主要腐蚀形式是表面和近表面晶界处Cr的选择性流失。316H不锈钢由于含有Mo，腐蚀深度及失重均低于304不锈钢。腐蚀后，两种不锈钢的表面均出现了富集Ni和Fe的腐蚀层，而近表面区域均出现了大量的纳米级析出相。EDS分析结果显示，这些析出相是Cr和Al的氮化物或碳氮化物，析出相显著提高了材料的硬度。

关键词 ： 304不锈钢, 316H不锈钢, 氟化物熔盐, 晶间腐蚀, 纳米级析出相

Abstract：

The corrosion behavior of 304 and 316H stainless steels in molten LiF-NaF-KF(FLiNaK) salt at 700 ℃ was studied by static immersion test, followed by SEM/EDS and EPMA analyses. Results show that the corrosion characteristics of the two stainless steels in molten FLiNaK salt are mainly selective depletion of Cr from the surface and grain boundaries underneath the surface. The corrosion depth and weight loss of 316H stainless steel are lower than those of 304 stainless steel, which may be ascribed to the Mo addition in 316H steel. After corrosion, the two steels show surface corrosion layers enriched in Ni and Fe, as well as nano-sized precipitates in the steel matrix near the surface. EDS analyses suggest these precipitates to be Cr and Al nitrides or carbonitrides. The formation of these precipitates significantly increases the hardness of the materials.

Key words： 304 stainless steel 316H stainless steel molten fluoride salt intergranular corrosion nano-sized precipitate

收稿日期: 2018-01-02

ZTFLH:

TG172.6

基金资助:国家自然科学基金(51301025);国家自然科学基金(51141001);国家自然科学基金(51501217)

通讯作者: 邱玮,冷滨 E-mail: hncsqqwk86@163.com;lengbin@sinap.ac.cn

Corresponding author: Wei QIU,Bin LENG E-mail: hncsqqwk86@163.com;lengbin@sinap.ac.cn

作者简介: 刘辉，男，1992年生，硕士生

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引用本文:

刘辉,邱玮,冷滨,俞国军. 304和316H不锈钢在LiF-NaF-KF熔盐中的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2019, 39(1): 51-58.
Hui LIU, Wei QIU, Bin LENG, Guojun YU. Corrosion Behavior of 304 and 316H Stainless Steels in Molten LiF-NaF-KF. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 51-58.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.001 或 https://www.jcscp.org/CN/Y2019/V39/I1/51

表1 304和316H不锈钢的化学成分

图1 不锈钢静态腐蚀浸泡实验容器示意图

表2 腐蚀实验后FLiNaK盐中主要合金元素含量的ICP-OES分析结果

图2 经700 ℃的FLiNaK熔盐腐蚀400 h后304和316H不锈钢的表面SEM形貌

图3 304和316H不锈钢在FLiNaK熔盐中腐蚀400 h后截面的Cr，Fe和Ni的EPMA面扫描分析结果

图4 304和316H不锈钢腐蚀后截面的背散射像以及内部未受腐蚀影响区EDS线扫结果 (对应高倍像中的黑线)

表3 304和316H不锈钢腐蚀后内部各区域EDS元素分析 (括号内的数字对应图4中的相应区域)

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