海水腐蚀导致铜镍合金的沿晶析出

中国腐蚀与防护学报

1997, Vol. 17

Issue (1): 1-6

研究报告

本期目录 | 过刊浏览

海水腐蚀导致铜镍合金的沿晶析出

林乐耘;刘少峰;朱小龙

北京有色金属研究总院;北京100088;北京有色金属研究总院;北京100088;北京有色金属研究总院;北京100088

SEAWATER-CORROSION-INDUCED INTERGRANULAR PRECIPITATION IN Cu-Ni ALLOY

LIN Leyun LIU Shaofeng ZHU Xiaolong (Beijing Genaral Research Institute for Non-Ferrous Metals)

全文: PDF(4004 KB)

摘要: 半硬态B_(Fe30-1-1)铜镍合金管材在实海暴露过程中随着表面氧化膜的腐蚀脱落,在晶界上出现沿晶析出物,形成较大的沿晶腐蚀倾向。TEM观察表明,这种析出物是调幅分解(Spinodaldecomposition)的产物,其衍衬象为明暗相间的条纹,调幅波长小于50nm。该析出物使材料在拉伸时出现脆性沿晶断口,强度略有上升,但大大恶化了材料的耐海水腐蚀性能。文中根据试验结果阐明了析出物的生成动力,认为是海水腐蚀导致材料的应力状态改变(即应变诱生)及合金元素沿晶界向表层的扩散促使已形核的析出物粗化所致。

关键词 ：铜镍合金, 实海暴露, 沿晶腐蚀, 沿晶析出, 应变诱生, 形核与粗化

Abstract：Precipitation at grain boundaries of Cu-Ni alloy semirigid tubes exposed to seawater took place along with corrosion peeling of the surface oxide film, and the alloy's intergranular corrosion sensitivity increased significantly as a result of the precipitation process. According to TEM observation, the precipitates were product of spinodal decomposition and possessed diffraction pattern of alternate bright/dark strips with widths less than 50nm. The presence of precipitates caused intergranular brittle fracture of the material when tensile test was conducted. Its tensile strength slightly increased but the corrosion resistance of the tube was considerably impaired. The precipitation could be attributed to the change of stress condition in the material. The diffusion of alloy elements along grain boundaries towards surface film resulted in coarsening of the precipitates.

Key words： Cu-Ni alloy Seawater exposure Intergranular corrosion Intergranular precipitation Strain induced Nucleation and coarsening

收稿日期: 1997-02-25

基金资助:国家自然科学基金资助项目

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引用本文:

林乐耘;刘少峰;朱小龙. 海水腐蚀导致铜镍合金的沿晶析出[J]. 中国腐蚀与防护学报, 1997, 17(1): 1-6.
. SEAWATER-CORROSION-INDUCED INTERGRANULAR PRECIPITATION IN Cu-Ni ALLOY. J Chin Soc Corr Pro, 1997, 17(1): 1-6.

链接本文:

https://www.jcscp.org/CN/ 或 https://www.jcscp.org/CN/Y1997/V17/I1/1

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