增材制造Ti6Al4V合金的闪速等离子体电解氧化与在生理介质中的电化学行为
Flash plasma electrolytic oxidation and electrochemical behaviour in physiological media of additive manufacturing Ti6Al4V alloy
H.MORA-SANCHEZ 1C.RAMOS 2M.MOHEDANO 2B.TORRES 3R.ARRABAL 2E.MATYKINA2
作者信息
- 1. Departamento de Ingeniería Química y de Materiales,Facultad de Ciencias Químicas,Universidad Complutense de Madrid,28040 Madrid,Spain;CIDETEC,Basque Research and Technology Alliance(BRTA),Po.Miramón 196,20014 Donostia-San Sebastián,Spain
- 2. Departamento de Ingeniería Química y de Materiales,Facultad de Ciencias Químicas,Universidad Complutense de Madrid,28040 Madrid,Spain
- 3. Departamento Matemática Aplicada,Ciencia e Ingeniería de Materiales y Tecnología Electrónica,Universidad Rey Juan Carlos,C/Tulipán s/n,Móstoles 28933,Madrid,Spain
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摘要
研究激光粉末床熔融增材制造(AM)(又称直接金属激光烧结)技术制备的Ti6Al4V合金等离子体电解氧化(PEO)处理及其电化学行为.通过短时间(＜120 s)PEO处理(也称闪速PEO),在AM合金和传统合金表面制备了3～10 μm厚、含Ca和P的涂层.然后在改良的α-MEM溶液中,通过动电位极化曲线和电化学阻抗谱(EIS)评估了合金的电化学行为.与传统合金相比,AM合金中形成了细小的层片状α显微组织和层间小尺寸的β相颗粒,这促使了火花的产生,从而促进了 PEO涂层的生长.闪速PEO涂层提高了传统合金和AM合金的耐腐蚀性,最薄的涂层(＜3 μm)提供了高达3倍的保护.AMTi6A14V由于其高的晶界密度,易受局部缝隙腐蚀的影响.而即使短至35 s的闪速PEO处理也足以成功避免这种情况.
Abstract
The objective of this work is to understand the plasma electrolytic oxidation(PEO)treatment and electrochemical behaviour of a Ti6A14V alloy manufactured by a laser powder bed fusion additive manufacturing(AM)technique known as direct metal laser sintering(DMLS).Ca and P-containing coatings were produced with short time(＜120 s)PEO treatments(also termed as Flash-PEO)obtaining 3-10 μm-thick coatings on both the AM alloy and a conventional counterpart.Subsequently,the electrochemical behaviour of the bare and treated alloys was assessed in a modified α-MEM solution via potentiodynamic polarization and electrochemical impedance spectroscopy(EIS).The fine α-lamellar microstructure of the AM alloy with small β-phiase particles at the interlamellar spaces was seen to advance the onset of sparking promoting faster growth of PEO coating in comparison to the conventional alloy.Flash-PEO coatings enhanced the corrosion protection of both conventional and AM alloys,the thinnest(＜3 μm)coatings providing up to three times greater protection.AM Ti6A14V was found to be susceptible to localized crevice corrosion which could be assigned to the high grain boundary density.Flash-PEO treatments,even as short as 35 s,were sufficient to successfully prevent it.
关键词
增材制造/激光粉末床熔融/等离子体电解氧化/闪速PEO/钛/缝隙腐蚀/α-MEMKey words
additive manufacturing/laser powder bed fusion/plasma electrolytic oxidation/Flash-PEO/titanium/crevice corrosion/α-MEM引用本文复制引用
基金项目
MCIU/AEI/FEDER,UE(PID2021-124341OB-C22)
MCIU/AEI/FEDER,UE(PID2021-124341OB-C21)
Regional Government of Madrid and EU Structural Funds(ADITIMAT-CM)(S2018/NMT-4411)
&&(RYC-2017-21843)
Regional Government of Madrid and EU Structural Funds(PEJD-2019-POST/IND-16119)
UCM(FEI-EU-20-05)
出版年
2024
NETL
NSTL
维普
万方数据