Relationship between Corrosion Resistance and Microstructure of Copper-Nickel Alloy Pipes in Marine Engineering

Abstract:

Copper-Nickel alloy pipes in marine engineering have been suffering severe seawater corrosion and erosion-corrosion. In this work, six kinds of Cu-Ni alloy pipes with different service lives delivered by two manufacturers were used to clarify the relationship between corrosion resistance and microstructure. The corrosion behaviors of the samples in 3.5 wt.% NaCl solution were studied by electrochemical measurements. Chemical composition, grain size distribution, crystallographic orientation, and grain boundary characterization distribution (GBCD) were investigated by energy-dispersive spectrometry (EDS), metallography and electron backscattered diffraction (EBSD) technology. There were no obvious differences in chemical composition and GBCD in contrast with size and uniformity of grains. Pipes with large grains and a broader grain size distribution had better corrosion resistance. It was also found that the accuracy of experimental data greatly depended on the quality of the sample surface in EBSD analysis. The scratches and contamination during sample preparation have a strong impact on the imaging quality and the calculation of GBCD.

• Periodical: Materials Science Forum (Volume 944)
• Pages: 389-397
• DOI: https://doi.org/10.4028/www.scientific.net/MSF.944.389
• Online since: January 2019
• Authors: Zhen Jiang Tan, Tong Da Ma*, Li Min Zhang, Wen Mei Zhang, Rong Guang Jia, Dong Dong Cao, Hong Ji
• Keywords: Copper-Nickel Alloy, Corrosion, EBSD, Electrochemistry, GBCD, Grain Size Distribution

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