首页|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

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

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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.
Flash plasma electrolytic oxidation and electrochemical behaviour in physiological media of additive manufacturing Ti6Al4V alloy
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.

additive manufacturinglaser powder bed fusionplasma electrolytic oxidationFlash-PEOtitaniumcrevice corrosionα-MEM

H.MORA-SANCHEZ、C.RAMOS、M.MOHEDANO、B.TORRES、R.ARRABAL、E.MATYKINA

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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

Departamento Matemática Aplicada,Ciencia e Ingeniería de Materiales y Tecnología Electrónica,Universidad Rey Juan Carlos,C/Tulipán s/n,Móstoles 28933,Madrid,Spain

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-MEM

MCIU/AEI/FEDER,UEMCIU/AEI/FEDER,UERegional Government of Madrid and EU Structural Funds(ADITIMAT-CM)&&Regional Government of Madrid and EU Structural FundsUCM

PID2021-124341OB-C22PID2021-124341OB-C21S2018/NMT-4411RYC-2017-21843PEJD-2019-POST/IND-16119FEI-EU-20-05

2024

10.1016/S1003-6326(23)66460-X

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(4)
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