日本金属学会誌

J. Japan Inst. Metals, Vol. 64, No. 3 (2000),
pp. 207-212

Effect of Cu Addition on the Corrosion Resistance of a Ni3B--Dispersed Ni--Based Alloy in a HCl Aqueous Solution

Guofeng Zhang, Masao Morishita, Masaki Inada*1 and Koichiro Koyama

Department of Materials Science and Engineering, Faculty of Engineering, Himeji Institute of Technology, Himeji 671--2201

Abstract:

The corrosion of Ni3B--dispersed Ni--based alloys containing Cr, Mn, Fe, Co, or Cu in the 10%massHCl aqueous solution was examined by measuring the mass loss and corrosion potential, and by metallography. The corrosion proceeded by a mechanism in which the Ni matrix worked as the anode while the Ni3B phase worked as the cathode. The addition of Cr, Mn, or Fe accelerated the corrosion rate while the addition of Co did not affect the corrosion rate. Conversely, the addition of Cu greatly improved the corrosion resistance. When Cu was added to the alloy, the corrosion potential of the Ni matrix shifted to the noble side by about 45 mV. The corrosion potential of the Ni matrix containing Cu became the almost same as that of the Ni3B phase in 80 minutes. As a result the preferential corrosion of the Ni matrix was extremely retarded.


(Received January 13, 2000)

Keywords:

Ni3B--dispersed nickel--based alloy, corrosion, addition of copper


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