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

J Chin Soc Corr Pro

1997, Vol. 17

Issue (1): 1-6 DOI:

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

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

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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

Received: 25 February 1997

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LIN Leyun LIU Shaofeng ZHU Xiaolong (Beijing Genaral Research Institute for Non-Ferrous Metals). SEAWATER-CORROSION-INDUCED INTERGRANULAR PRECIPITATION IN Cu-Ni ALLOY. J Chin Soc Corr Pro, 1997, 17(1): 1-6.

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y1997/V17/I1/1

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