Zinc-Aluminum Corrosion Resistance and Inactivation Process of NiCr-Cr3C2 Cermet oating

doi:10.3969/j.issn.1672-6952.2016.03.014

Journal of Liaoning Petrochemical University ›› 2016, Vol. 36 ›› Issue (3): 58-62.DOI: 10.3969/j.issn.1672-6952.2016.03.014

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Zinc-Aluminum Corrosion Resistance and Inactivation Process of NiCr-Cr₃C₂ Cermet oating

Li Deyuan¹， Sui Wenlong¹， Huang He¹, Zhang Guangwei²

1.College of Materials Science and Engineering, Shenyang University of Technology, Shenyang Liaoning 110178, China; [JP] 2.Dalian Huarui Heavy Industrial Special Spare Parts Co.,Ltd., Dalian Liaoning 116052, China

Received:2015-10-13 Revised:2015-11-04 Published:2016-06-25 Online:2016-07-01

NiCr-Cr₃C₂陶瓷涂层在锌铝腐蚀中的失效分析

李德元¹,隋文龙¹,黄鹤¹,张广伟²

(1.沈阳工业大学材料科学与工程学院,辽宁沈阳110178;2.大连华锐重工特种备件制造有限公司,辽宁大连116052)

作者简介:李德元(1959-),男,博士,教授,博士生导师,从事材料表面强化技术的研究;E-mail:dmy1962@sina.com。
基金资助:
沈阳市科技局科技攻关项目(F14-231-1-26)

Abstract

Abstract: Cermet coatings of NiCr-Cr₃C₂ were thermally sprayed on 304 sink roll by high velocity oxygenfuel spraying technique. The corrosion resistance of prepared sample was tested at 600 ℃ in a molten zinc-aluminum containing 55% of aluminum. The inactivation process of sink roll was studied. SEM was used to determine the morphology changes of initial powder and the sample after the corrosive experiment. EDS was used to determine the element composition of initial powder and the coating after corrosion. The data showed that the porosity, bonding strength and micro hardness were 2.9%, 82.76 MPa and 1 078.67 HV respectively before corrosion. While after 1 day's corrosion, NiCr in NiCr-Cr₃C₂ cermet was found to be dissolved in Zn, thus the protection ability of Cr₃C₂was lost.

Key words: NiCr-Cr₃C₂ , HVOF, Coating, Molten zinc-aluminium corrosion, Dissolution, Failure mechanism

摘要： 运用超音速火焰喷涂技术在304不锈钢沉浸辊上喷涂NiCr-Cr₃C₂ 陶瓷涂层。将制备后的试样置于600℃铝质量分数为55%的熔融锌铝混合液中,并分析涂层在其中的腐蚀机理和失效过程。采用SEM 观察了原始粉末的形态并对涂层被腐蚀前后的形貌进行对比观察,采用EDS检测了NiCr-Cr₃C₂ 粉末的原始构成以及涂层被腐蚀后其中的元素变化。结果表明,NiCr-Cr₃C₂ 陶瓷涂层的孔隙率为2.9%,平均结合强度为82.76MPa,显微维氏硬度的平均值为1078.67HV。NiCr-Cr₃C₂ 陶瓷涂层在被沉浸1d后,在涂层中发现了元素构成的变化且有层次区分,NiCr-Cr3C2 涂层失效原因是Ni-Cr基体被Zn溶解,导致了涂层溃散,涂层中的Cr₃C₂也同时失去保护作用,并漂移到Zn-Al熔体中。

关键词: NiCr-Cr3C2, 超音速火焰喷涂, 涂层, 液态锌铝腐蚀, 溶解, 失效机制

Li Deyuan， Sui Wenlong， Huang He, Zhang Guangwei.

Zinc-Aluminum Corrosion Resistance and Inactivation Process of NiCr-Cr₃C₂ Cermet oating[J]. Journal of Liaoning Petrochemical University, 2016, 36(3): 58-62.

李德元,隋文龙,黄鹤,张广伟. NiCr-Cr₃C₂陶瓷涂层在锌铝腐蚀中的失效分析[J]. 辽宁石油化工大学学报, 2016, 36(3): 58-62.

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Zinc-Aluminum Corrosion Resistance and Inactivation Process of NiCr-Cr₃C₂ Cermet oating

NiCr-Cr₃C₂陶瓷涂层在锌铝腐蚀中的失效分析

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