Chemical Composition Optimization and Sea Water Corrosion Resistance of a Ductile Cast Iron

doi:10.11902/1005.4537.2014.028

Journal of Chinese Society for Corrosion and protection

2014, Vol. 34

Issue (6): 537-543 DOI: 10.11902/1005.4537.2014.028

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Chemical Composition Optimization and Sea Water Corrosion Resistance of a Ductile Cast Iron

CUI Junjun^1,², ZHANG Yajing¹, WANG Linlin¹, CHEN Xiaogang³, ZHANG Guozhi¹(

)

1. School of Materials and Metallurgy, Northeastern University, Shenyang 110819, China
2. College of Mechanical and Vehicle Engineering , Shenyang Institute of Technology, Fushun 113122, China
3. Special Valve Ltd., Tieling Valve Group, Tieling 112616, China

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Abstract

Without changing the content of the alloying elements C, Si, Mn, Cu and Al in an ordinary ductile cast iron, of which the influence of the addition of Cr and Ni on the microstructure, mechanical performance and the sea water corrosion resistance was studied by means of metallography observation, hardness and cutting test, weight loss test and polarization curve measurement in sea water, as well as surface EPMA analysis for the corrosion products. Accordingly an optimal chemical composition of that cast iron was acquired. The results showed that elements Cr, Cu and Al are beneficial to the formation of a thin and tightly adherent passive film on the surface, which can enhance the corrosion resistance of the alloyed cast iron. Element Ni can positively rises the corrosion potential and significantly reduce corrosion current density of the alloyed cast iron. As a comprehensive result, the alloyed cast iron with Cr content 0.6%~0.8% (mass fraction) exhibits not only better cutting performance, but also superior corrosion resistance in comparison with the ordinary ductile cast iron.

Key words: ductile cast iron sea water corrosion component design corrosion resistance cutting performance

ZTFLH:

TG174.22

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	Junjun CUI
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Cite this article:

CUI Junjun, ZHANG Yajing, WANG Linlin, CHEN Xiaogang, ZHANG Guozhi. Chemical Composition Optimization and Sea Water Corrosion Resistance of a Ductile Cast Iron. Journal of Chinese Society for Corrosion and protection, 2014, 34(6): 537-543.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.028 OR https://www.jcscp.org/EN/Y2014/V34/I6/537

Table 1 Chemical compositions design of sea water corrosion-resistant ductile cast irons

Fig.1 Optical microstructures of as-cast ductile cast irons containing 0%Ni (a), 0.4%Ni (b), 0.8%Ni (c) and 1.2%Ni (d)

Fig.2 Optical microstructures of as-cast ductile cast irons containing 1.0%Ni (a) and 2.0%Ni (b)

Fig.3 Brinell hardness of test samples I~VII

Fig.4 Corrosion rate of test samples corroded for different time (a) No.I~V/8 d, (b) No.VI and VII/16 d, (c) No.VII and ordinary nodular cast iron/60 d

Fig.5 Morphology (a) and Ni (b), O (c), Si (d), Cr (e), Al (f), Fe (g) and Cu (h) distributions in the rust layer of sample VII after sea water corrosion for 60 d

Fig.6 Polarization curves of the specimens before corrosion

Fig.7 Polarization curves of the specimens after corrosion of 16 d

Table 2 Corrosion potentials and currents of sample VI, VII and ordinary nodular cast iron before and after corrosion

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