激光选区熔化<strong>Inconel 718</strong>合金在<strong>NaOH</strong>溶液中的腐蚀行为

doi:10.11900/0412.1961.2021.00386

金属学报

2022, Vol. 58

Issue (3): 324-333 DOI: 10.11900/0412.1961.2021.00386

研究论文

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激光选区熔化Inconel 718合金在NaOH溶液中的腐蚀行为

汤雁冰¹, 沈新旺¹^,², 刘志红², 乔岩欣²(

), 杨兰兰², 卢道华¹, 邹家生², 许静¹

^1.江苏科技大学海洋装备研究院镇江 212003
^2.江苏科技大学材料科学与工程学院镇江 212003

Corrosion Behaviors of Selective Laser Melted Inconel 718 Alloy in NaOH Solution

TANG Yanbing¹, SHEN Xinwang¹^,², LIU Zhihong², QIAO Yanxin²(

), YANG Lanlan², LU Daohua¹, ZOU Jiasheng², XU Jing¹

^1.Marine Equipment and Technology Institute, Jiangsu University of Science and Technology, Zhenjiang 212003, China
^2.School of Materials Science and Technology, Jiangsu University of Science and Technology, Zhenjiang 212003, China

引用本文:

汤雁冰, 沈新旺, 刘志红, 乔岩欣, 杨兰兰, 卢道华, 邹家生, 许静. 激光选区熔化Inconel 718合金在NaOH溶液中的腐蚀行为[J]. 金属学报, 2022, 58(3): 324-333.
Yanbing TANG, Xinwang SHEN, Zhihong LIU, Yanxin QIAO, Lanlan YANG, Daohua LU, Jiasheng ZOU, Jing XU. Corrosion Behaviors of Selective Laser Melted Inconel 718 Alloy in NaOH Solution[J]. Acta Metall Sin, 2022, 58(3): 324-333.

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摘要:

采用开路电位、动电位极化、电化学阻抗、恒电位极化、Mott-Schottky和X射线光电子能谱等测试技术研究了激光选区熔化增材制造Inconel 718合金(SLM Inconel 718)在0.1 mol/L NaOH溶液中的腐蚀行为，并与商用轧制Inconel 718合金(R Inconel 718)进行对比。结果表明，SLM Inconel 718合金与R Inconel 718合金均发生点蚀，SLM Inconel 718合金的点蚀优先发生在熔池边界和孔隙部位。相比R Inconel 718合金，SLM Inconel 718合金的活性更低、腐蚀速率更小、耐蚀性能更优，其主要原因在于：SLM Inconel 718合金表面生成的钝化膜中多孔NiO的含量更低，致密Cr₂O₃的含量更高，钝化膜更加致密，并且钝化膜的载流子密度更低，因此，SLM Inconel 718合金的钝化膜保护性能更好，耐蚀性能更优。

关键词 ：增材制造, Inconel 718合金, 激光选区熔化, 钝化膜, 碱性溶液

Abstract：

Inconel 718 alloy is a popular material used for additive manufacturing. Corrosion involvement is crucial for its application. The corrosion behaviors of the additive manufacturing Inconel 718 alloy in neutral NaCl solution and acidic solution have been thoroughly investigated and documented. However, information available in the literature regarding the corrosion behaviors of additive manufacturing Inconel 718 alloy in alkaline solution is insufficient. In this paper, the corrosion behavior of Inconel 718 alloy fabricated through selective laser melting (SLM Inconel 718) in NaOH solution was studied using open circuit potential (OCP), potentiodynamic polarization, electrochemical impedance spectroscopy (EIS), potentiostats polarization, Mott-Schottky analysis, and X-ray photoelectron spectroscopy (XPS). The results were compared with a commercial rolled Inconel 718 alloy (R Inconel 718). Pitting corrosion was observed in both SLM Inconel 718 alloy and R Inconel 718 alloy. SLM Inconel 718 alloy has lower activity and corrosion rate compared with R Inconel 718 alloy. Because the passive film formed on the surface of SLM Inconel 718 alloy has a lower content of porous NiO and a higher content of compact Cr₂O₃, the passive film is more compact; however, the donor/acceptor density is lower in the passive film.

Key words： additive manufacturing Inconel 718 selective laser melting passive film alkaline solution

收稿日期: 2021-09-07

ZTFLH:

TG172.5

基金资助:国家重点研发计划项目(2018YFC0309100);工信部高技术船舶项目No.2018[473],以及江苏高校自然科学基金项目

作者简介: 汤雁冰，男，1982年生，博士，教授级高级工程师

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	卢道华
	邹家生
	许静
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https://www.ams.org.cn/CN/10.11900/0412.1961.2021.00386 或 https://www.ams.org.cn/CN/Y2022/V58/I3/324

表1 激光选区熔化(SLM)和轧制(R)态Inconel 718合金的化学成分[16] (mass fraction / %)

图1 SLM Inconel 718和R Inconel 718的OM和SEM像

图2 SLM Inconel 718和R Inconel 718在0.1 mol/L NaOH溶液中的开路电位(EOCP)

图3 SLM Inconel 718和R Inconel 718在0.1 mol/L NaOH溶液中的动电位极化曲线

图4 SLM Inconel 718和R Inconel 718腐蚀前后的表面形貌

图5 SLM Inconel 718和R Inconel 718在0.1 mol/L NaOH溶液中的EIS(a) Nyquist plots (b) Bode plots

图6 EIS等效电路示意图

表2 SLM Inconel 718和R Inconel 718的EIS拟合结果

图7 SLM Inconel 718和R Inconel 718在0.1 mol/L NaOH溶液中的电流密度随时间变化的关系曲线以及与其对应的双对数曲线

图8 SLM Inconel 718和R Inconel 718在0.1 mol/L NaOH溶液中的Mott-Schottky曲线以及供体密度(Nd)和受体密度(Na)

图9 SLM Inconel 718和R Inconel 718合金的XPS谱Color online(a, b) Ni2p (c, d) Fe2p (e, f) Cr2p (g, h) Mo3d (i, j) Nb3d

图10 SLM Inconel 718和R Inconel 718合金钝化膜中不同元素的深度分布

图11 SLM Inconel 718和R Inconel 718合金钝化膜中不同成分的深度分布

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