晶粒尺寸对316LN不锈钢晶间腐蚀敏感性的影响

doi:10.11902/1005.4537.2015.099

中国腐蚀与防护学报

2016, Vol. 36

Issue (1): 25-30 DOI: 10.11902/1005.4537.2015.099

本期目录 | 过刊浏览

晶粒尺寸对316LN不锈钢晶间腐蚀敏感性的影响

彭新元^1,²(

),周贤良^1,²,华小珍²

1. 南京航空航天大学材料科学与技术学院南京 211106
2. 南昌航空大学江西省金属材料微结构调控重点实验室南昌 330063

Effect of Grain Size on Susceptibility to Intergranular Corrosion of 316LN Stainless Steel

Xinyuan PENG^1,²(

),Xianliang ZHOU^1,²,Xiaozhen HUA²

1. School of Material Science and Technology, Nanjing University of Aeronautics and Astronautics, Nanjing 211106, China
2. Key Laboratory for Microstructural Control of Metallic Materials of Jiangxi Province, Nanchang Hangkong University, Nanchang 330063, China

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摘要:

通过动电位再活化法,微观形貌观察以及表面相对电子功函数研究了晶粒尺寸对316LN不锈钢晶间腐蚀敏感性的影响.不同晶粒尺寸试样通过改变固溶时间来获得.结果表明:经相同敏化处理后,316LN不锈钢的晶间腐蚀敏感程度随着晶粒尺寸的增加而降低.细晶粒试样晶界有腐蚀沟,并连成网状,且晶界明显粗化,而粗晶粒试样无明显腐蚀.表面相对电子功函数数据表明,相对于细晶粒试样,粗晶粒试样表面电子结构分布更稳定.

关键词 ：动电位再活化法, 晶粒尺寸, 晶间腐蚀

Abstract：

The effect of grain size on the susceptibility to intergranular corrosion of 316LN stainless steel was investigated by means of electrochemical potentiokinetic reactivation test and electronic work function measurement, as well as microstructure characterization. Steel samples of various grain sizes were produced by heat treating the steel at 1100 ℃ for different duration. The result showed that the degree of sensitization decreases with increasing grain size; corrosion pits occur at grain boundaries and thereby form a network-like pits-chain for samples of fine grains. In the contrast, no obvious corrosion occurred on samples of coarse grain. The results of electronic work function measurement imply that the surface electronic density of states and charge density distributions for steel of coarse grains are much stable than that of fine grains.

Key words： electrochemical potentiokinetic reactivation grain size intergranular corrosion

基金资助:国家高技术研究发展计划项目 (2012AA03A507),江西省教育厅科技项目 (GJJ14534),江西省金属材料微结构调控重点实验室开放基金项目 (JW201223001) 和江苏高校优势学科建设工程资助项目 (PAPD) 资助

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引用本文:

彭新元,周贤良,华小珍. 晶粒尺寸对316LN不锈钢晶间腐蚀敏感性的影响[J]. 中国腐蚀与防护学报, 2016, 36(1): 25-30.
Xinyuan PENG, Xianliang ZHOU, Xiaozhen HUA. Effect of Grain Size on Susceptibility to Intergranular Corrosion of 316LN Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2016, 36(1): 25-30.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2015.099 或 https://www.jcscp.org/CN/Y2016/V36/I1/25

图1 经不同条件固溶热处理后试样的微观组织

表1 不同工艺处理后试样的晶粒尺寸

图2 不同晶粒尺寸试样敏化后的微观组织

图3 敏化后试样的SEM像和EDS结果

表2 不同晶粒尺寸试样的晶间腐蚀敏感性

图4 不同晶粒尺寸的316LN不锈钢的DLEPR曲线

图5 不同晶粒尺寸的316LN不锈钢经DLEPR测试后的表面形貌

图6 不同晶粒尺寸316LN不锈钢的EWF三维分布图

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