Effect of Mo Element and Heat Treatment on Corrosion Resistance of Ni2CrFeMox High-Entropy Alloyin NaCl Solution

doi:10.11900/0412.1961.2018.00558

Acta Metall Sin

2019, Vol. 55

Issue (7): 840-848 DOI: 10.11900/0412.1961.2018.00558

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Effect of Mo Element and Heat Treatment on Corrosion Resistance of Ni₂CrFeMo_x High-Entropy Alloyin NaCl Solution

Lin WEI¹,Zhijun WANG¹(

),Qingfeng WU¹,Xuliang SHANG²,Junjie LI¹,Jincheng WANG¹

1. State Key Laboratory of Solidification Processing, Northwestern Polytechnical University, Xi’an 710072, China
2. Citic Daika Co. , Ltd. , Qinhuangdao 066011, China

Cite this article:

Lin WEI,Zhijun WANG,Qingfeng WU,Xuliang SHANG,Junjie LI,Jincheng WANG. Effect of Mo Element and Heat Treatment on Corrosion Resistance of Ni₂CrFeMo_x High-Entropy Alloyin NaCl Solution. Acta Metall Sin, 2019, 55(7): 840-848.

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Abstract

As a new alloy design concept, the high-entropy alloy (HEA) and the formation of simple solid solution introduce excellent properties such as high hardness, high strength and corrosion resistance. Investigations have shown that the single solid solution CrCoFeNi alloy possesses good corrosion resistance. The addition of Mo is beneficial to the corrosion resistance of the HEAs for potential industrial applications in 3.5%NaCl (mass fraction) simulating seawater type environments. The major effect of Mo is to promote the pitting potential of the alloy and inhibit the dissolution of the passivation film by forming and retaining molybdenum oxyhydroxide or molybdates (MoO₄^2-). Considering that the cost of pure Co is higher, Ni and Co elements have similar atomic size and valence electron concentration, and the corrosion resistance of pure Ni is higher than that of pure Co, Ni₂CrFeMo_x HEA was designed by replacing Co element with Ni element in CoCrFeNiMo_x HEA. As the Mo content increases in the Ni₂CrFeMo_x HEAs, the interdendrite is a Cr and Mo rich σ phase, and the dendrite is a Cr and Mo depleted fcc phase. The potential difference between interdendrites and dendrites leads to galvanic corrosion, which accelerates the localized corrosion of alloys. Here, a solution heat treatment process is selected to reduce the precipitation phase and improve the corrosion resistance of the alloy. The effects of Mo element and heat treatment on the corrosion resistance of Ni₂CrFeMo_x HEA in 3.5%NaCl solution were tested. The results show that the corrosion resistance of as-cast Ni₂CrFeMo_x HEA is obviously higher than that of 316L stainless steel. The Ni₂CrFeMo_0.2 alloy has the best corrosion resistance because of its minimum dimensional passive current density and corrosion current density. However, the addition of excessive Mo leads to the precipitation of σ phase and galvanic corrosion, which reduces the corrosion resistance of the alloy. After solution treatment, the uniformity of alloy structure and element distribution weakens galvanic corrosion, and the corrosion resistance is obviously improved.

Key words: Mo element high entropy alloy solution treatment corrosion resistance

Received: 21 December 2018

ZTFLH:

TG132

Fund: National Natural Science Foundation of China(Nos.51471133);National Natural Science Foundation of China(51771149)

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	Lin WEI
	Zhijun WANG
	Qingfeng WU
	Xuliang SHANG
	Junjie LI
	Jincheng WANG

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https://www.ams.org.cn/EN/10.11900/0412.1961.2018.00558 OR https://www.ams.org.cn/EN/Y2019/V55/I7/840

Fig.1 Cyclic polarization curves of the as-cast Ni₂Cr-FeMo_x alloys and 316L stainless steel in 3.5%NaCl solution (E_prot—protection potential, E_b—breakdown potential)

Table 1 The electrochemical parameters of the as-cast Ni₂CrFeMo_x alloys and 316L stainless steel in 3.5%NaCl solution

Fig.2 SEM images of the as-cast Ni₂CrFeMo_x alloys with x=0.1 (a), x=0.2 (b), x=0.3 (c), x=0.4 (d), x=0.5 (e) and 316L stainless steel (f) polarized in 3.5%NaCl solution

Fig.3 Cyclic polarization curves of the heat treated Ni₂CrFeMo_x alloys in 3.5%NaCl solution

Table 2 The electrochemical parameters of the heat treated Ni₂CrFeMo_x alloys in 3.5%NaCl solution

Fig.4 SEM images of the heat treated Ni₂CrFeMo_x alloys with x=0.1 (a), x=0.2 (b), x=0.3 (c), x=0.4 (d), x=0.5 (e) polarized in 3.5%NaCl solution

Fig.5 EDS maps of as-cast (a) and heat treated (b) Ni₂FeCrMo_0.2 alloy (unpolarized)

Fig.6 Nyquist plots (a) and Bode plots (b) of as-cast Ni₂FeCrMo_x alloys in 3.5%NaCl solution

Fig.7 Nyquist plots (a) and Bode plots (b) of as-cast and heat-treated Ni₂FeCrMo_0.2 alloys in 3.5%NaCl solution

Fig.8 XPS spectra of as-cast (a1~a4) and heat-treated (b1~b4) Ni₂CrFeMo_0.2 alloy in 3.5%NaCl solution after constant potential+450 mV (vs SHE) polarization for 4 h

Table 3 Atomic ratio between different oxidation states of each element in as-cast and heat-treated Ni₂CrFeMo_0.2 alloy after XPS analysis

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