DD98M纳米晶AlSi渗层制备及抗高温腐蚀性能研究

doi:10.11902/1005.4537.2018.026

中国腐蚀与防护学报

2019, Vol. 39

Issue (1): 59-67 DOI: 10.11902/1005.4537.2018.026

研究报告

本期目录 | 过刊浏览

DD98M纳米晶AlSi渗层制备及抗高温腐蚀性能研究

陈浩^1,²,陈庆¹,辛丽²(

),时龙¹,朱圣龙²,王福会^3,⁴

1. 吉林化工学院机电工程学院吉林 132022
2. 中国科学院金属研究所金属腐蚀与防护实验室沈阳 110016
3. 东北大学材料科学与工程学院沈阳 110819
4. 沈阳材料科学国家研究中心沈阳 110016

Preparation and High Temperature Corrosion Behavior of Aluminized Nanocrystalline Coating on DD98M Alloy

Hao CHEN^1,²,Qing CHEN¹,Li XIN²(

),Long SHI¹,Shenglong ZHU²,Fuhui WANG^3,⁴

1. College of Mechanical and Electrical Engineering, Jilin Institute of Chemical Technology, Jilin 132022, China
2. Laboratory for Corrosion and Protection, Institute of Metal Research, Chinese Academy of Sciences, Shenyang 110016, China
3. School of Materials Science and Engineering, Northeastern University, Shenyang 110819, China
4. Shenyang National Laboratory for Materials Science, Shenyang 110016, China

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摘要:

采用磁控溅射技术在DD98M合金表面制备了同成份的纳米晶，采用多弧离子镀技术在DD98M纳米晶涂层表面沉积了AlSi涂层，对上述制备态纳米晶+AlSi复合涂层进行了真空扩散处理，得到了外层为β-NiAl层、内层为γ'-Ni₃Al层的双层结构复合涂层。研究了合金、DD98M纳米晶涂层及复合涂层在1050 ℃恒温氧化及900 ℃下Na₂SO₄+25%K₂SO₄混合熔盐体系中的热腐蚀行为。结果表明：1050 ℃恒温氧化时，DD98M合金表面生成NiO，α-Al₂O₃，Ta_0.8O₂，CrTaO₄及NiAl₂O₄等组成的混合氧化物膜，氧化膜开裂剥落严重。纳米晶涂层表面生成α-Al₂O₃和少量NiAl₂O₄组成的混合氧化物膜，复合涂层表面形成了均匀致密的单一α-Al₂O₃膜。纳米晶涂层和复合涂层大幅提高了合金的抗恒温氧化性能。在900 ℃下Na₂SO₄+25%K₂SO₄熔盐中，DD98M合金20 h后即发生了灾难性腐蚀，沉积态纳米晶及其预氧化涂层提高了合金的抗热腐蚀性能，复合涂层大幅提高了合金的抗热腐蚀性能。

关键词 ： DD98M合金, 纳米晶涂层, AlSi涂层, 真空扩散处理, 恒温氧化, 热腐蚀

Abstract：

A nanocrystalline coating of DD98M was firstly deposited on the surface of high temperature alloy DD98M via magnetron sputtering, then a thin layer of Al-5.2Si (mass fraction, %) was next deposited via multi-arc ion plating on top of the nanocrystalline coating, which was further subjected to vacuum diffusion treatment at 870 ℃ for 3 h, finally a two-layered aluminide coating composed of an outer β-NiAl layer and an inner γ'-Ni₃Al layer was obtained on the DD98M alloy. The isothermal oxidation behavior at 1050 ℃ in air and hot corrosion performance in molten salts Na₂SO₄+25%K₂SO₄ at 900 ℃ of the plain DD98M alloy, the nanocrystalline coating or the two-layered aluminide coating coated DD98M alloy were comparatively investigated. Results revealed that after isothermal oxidation at 1050 ℃, mixed oxides of NiO, α-Al₂O₃, Ta_0.8O₂, CrTaO₄ and NiAl₂O₄ formed on the surface of DD98M alloy, and the oxide scale cracked and spalled seriously. An oxide scale composed of α-Al₂O₃ with a small amount of NiAl₂O₄ formed on the surface of the nanocrystalline coating of DD98M alloy. A dense oxide scale of simplex α-Al₂O₃ formed on the surface of the two-layered aluminide coating. It seems that the bilayered aluminide coating prepared with tri-step process can significantly enhance the oxidation resistance of the DD98M alloy. In molten salts Na₂SO₄+25%K₂SO₄ at 900 ℃, catastrophic corrosion occurred for the plain DD98M alloy only after 20 h corrosion. The as-deposited and pre-oxidation nanocrystalline coating can improved the corrosion resistance of the alloy to certain extent. However, the two-layered aluminide coating can apparently improve the corrosion resistance of the DD98M alloy.

Key words： DD98M alloy nanocrystalline coating AlSi coating vacuum diffusion treatment Isothermal oxidation hot corrosion

收稿日期: 2018-02-14

ZTFLH:

TG174

基金资助:国家自然科学基金(U1537107)

通讯作者: 辛丽 E-mail: xli@imr.ac.cn

Corresponding author: Li XIN E-mail: xli@imr.ac.cn

作者简介: 陈浩，男，1991年生，硕士生

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引用本文:

陈浩,陈庆,辛丽,时龙,朱圣龙,王福会. DD98M纳米晶AlSi渗层制备及抗高温腐蚀性能研究[J]. 中国腐蚀与防护学报, 2019, 39(1): 59-67.
Hao CHEN, Qing CHEN, Li XIN, Long SHI, Shenglong ZHU, Fuhui WANG. Preparation and High Temperature Corrosion Behavior of Aluminized Nanocrystalline Coating on DD98M Alloy. Journal of Chinese Society for Corrosion and protection, 2019, 39(1): 59-67.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2018.026 或 https://www.jcscp.org/CN/Y2019/V39/I1/59

图1 制备态纳米晶+AlSi复合涂层的截面和断口形貌

图2 纳米晶/AlSi复合涂层在870 ℃真空退火3 h后的截面形貌及对应的XRD谱

图3 DD98M合金、纳米晶涂层及复合涂层在1050 ℃空气中的氧化动力学曲线

图4 DD98M合金、纳米晶涂层和复合涂层在1050 ℃下氧化100 h后的XRD谱

图5 DD98M合金，纳米晶涂层和复合涂层在1050 ℃下空气中氧化100 h后的表面和截面微观形貌

图6 DD98M合金、两种纳米晶涂层及复合涂层在900 ℃下Na2SO4+25%K2SO4混合盐中的腐蚀动力学曲线

图7 DD98M合金、两种纳米晶涂层及复合涂层在900 ℃下Na2SO4+25%K2SO4混合熔盐中腐蚀后的表面和截面微观形貌

图8 DD98M合金，两种纳米晶涂层及复合涂层在900 ℃ Na2SO4+25%K2SO4混合熔盐体系中腐蚀后的XRD谱

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