Improvement of corrosion resistance of PEO coated dissimilar Ti/Mg0.6Ca couple  

作　　者：Ting Wu Mohammad Fazel Maria Serdechnova Vasil M.Garamus D.C.Florian Wieland Fabian Wilde Julian Moosmann Thomas Ebel Regine Willumeit-Römer Carsten B.lawert Mikhail L.Zheludkevich 

机构地区：[1]Institute of Surface Science,Helmholtz Zentrum Hereon,Max-Planck Str.1,21502 Geesthacht,Germany [2]Institute of Metallic Biomaterials,Helmholtz Zentrum Hereon,Max-Planck Str.1,21502 Geesthacht,Germany [3]Institute of Materials Physics,Helmholtz Zentrum Hereon,Max-Planck Str.1,21502 Geesthacht,Germany [4]Institute for Materials Science,Faculty of Engineering,Christian-Albrechts-Universität zu Kiel,Kaiserstrasse 2,24143 Kiel,Germany

出　　处：《Journal of Magnesium and Alloys》2024年第7期2741-2755,共15页镁合金学报（英文）

基　　金：We also thank DESY(Hamburg,Germany)for granting beamtime to the proposal I-20221296 and support of the PETRAⅢP05 end-station.

摘　　要：With the growing demand for weight reduction,the application of joint lightweight structural materials is increasing.Magnesium alloys feature low density,high specific strength and good formability,offering significant advantages for fuel efficiency and load capacity.Combined with Ti,a dissimilar Ti/Mg composite material provides great flexibility combining the properties of each material.However,because of the great differences in chemical and electrochemical properties between Mg and Ti,it is imperative to address the galvanic corrosion problem of such dissimilar Ti/Mg components.This work presents an investigation of the PEO processing of sintered Ti/Mg0.6Ca couples,aiming to improve the corrosion resistance of such dissimilar alloy combinations using a phosphate-aluminate electrolyte.The results show that uniform and continuous coatings can be formed on the dissimilar Ti/Mg0.6Ca couple.The coating mainly contains MgO and MgAl_(2)O_(4)on the Mg0.6Ca side,and Al_(2)TiO_(5)is the dominant phase on the Ti side.The work also took advantage of synchrotron X-ray computed tomography(CT)scanning to achieve 3D reconstruction of the coating morphology,which can be a fast method to assess the porosity and compactness of the coating and further predict the coating corrosion resistance.The coating effectively improved the corrosion resistance of the dissimilar Ti/Mg0.6Ca couple.

关 键 词：Plasma electrolytic oxidation Galvanically couple Material mix Corrosion resistance 

分 类 号：O53[理学—等离子体物理] TB304[理学—物理]