固溶态不锈钢在尿素生产介质中的晶间腐蚀与磷(硅)的晶界富集

中国腐蚀与防护学报

1985, Vol. 5

Issue (1): 26-33

研究报告

本期目录 | 过刊浏览

固溶态不锈钢在尿素生产介质中的晶间腐蚀与磷(硅)的晶界富集

于福洲;许淳淳;姚建明

北京化工学院;北京化工学院;北京化工学院

INTERGRANULAR CORROSION OF NON-SENSITIZED STAINLESS STEEL IN THE UREA MEDIUM AND THE SEGREGATION OF PHOSPHORUS AND SILICON AT GRAIN BOUNDARIES

Yu Fuzhou Xu Chunchun Yao Jianming (Beijing Institute of Chemical Technology)

全文: PDF(2805 KB)

摘要: 用扫描电镜、透射电镜能谱和俄歇能谱等研究了尿素厂汽提塔内实际腐蚀部件的腐蚀形态和机理。结果发现:固溶态的316L 不锈钢发生了晶间腐蚀,并伴生全面腐蚀和晶粒脱落,因而晶间腐蚀不深;其晶界区并不贫铬但富集磷、硅,晶界磷含量比钢中平均含量高二个数量级;而同样介质条件下未遭受晶间腐蚀的固溶态00Cr25Ni22Mo2N 高纯不锈钢却未见磷、硅的晶界富集。故认为磷(硅)的晶界富集是固溶态316L 不锈钢在尿素生产介质中产生晶间腐蚀的重要原因之一.

Abstract：The morphology and mechanism of corrosion,of the internals of the stripper of the urea plant were studied by SEM,AES and TEM spectrometry etc.It was found that intergranular corrosion IGC ocurred for 316L stainless steel in the non- sensitized condition and that there was no Cr depletion,instead,P and Si were enriched at grain boundary regions.The P content at the grain boundary was two orders of magnitude greater than that of the average.However,there was no segregation of P or Si at grain boundary region in high purity 25Cr-22Ni- 2Mo-N samples cut from the internals which did not suffer from IGC in the same environment. Therefore,the authors consider that segregation of P and Si at grain boundaries is one of the important reasons for IGC of non-sensitized 316L SS in the urea medium.

收稿日期: 1985-02-25

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引用本文:

于福洲;许淳淳;姚建明. 固溶态不锈钢在尿素生产介质中的晶间腐蚀与磷(硅)的晶界富集[J]. 中国腐蚀与防护学报, 1985, 5(1): 26-33.
. INTERGRANULAR CORROSION OF NON-SENSITIZED STAINLESS STEEL IN THE UREA MEDIUM AND THE SEGREGATION OF PHOSPHORUS AND SILICON AT GRAIN BOUNDARIES. J Chin Soc Corr Pro, 1985, 5(1): 26-33.

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https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1985/V5/I1/26

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[3] Briant,C.L..Corrosion,36,508(1980)
[4] Doig,P.,Flewitt,P.E.J.,Wild,R.K.,Philosophical Magazine,37,759(1978)

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