Tailoring vapor-deposited ZnMg-Zn bilayer coating for steels by diffusion-driven phase transformation

JOURNAL OF ALLOYS AND COMPOUNDS

卷:836

Article

Sabooni, S.¹  Galinmoghaddam, E.¹  Turkin, A. A.²  Lu, L. Q.¹  Westerwaal, R. J.³  Boelsma, C.³  Zoestbergen, E.³  Pei, Y. T.¹ 

[1] Univ Groningen, Engn & Technol Inst Groningen, Dept Adv Prod Engn, Nijenborgh 4, NL-9747 AG Groningen, Netherlands

[2] Natl Sci Ctr, Kharkiv Inst Phys & Technol, Akad St 1, UA-61108 Kharkiv, Ukraine

[3] Tata Steel Nederland Technol BV, POB 1000, NL-1970 CA Ijmuiden, Netherlands

关键词: ZnMg-Zn bilayer Coatings;    Adhesion;    Diffusion-limited growth model;    Phase transformation;    Corrosion;    Physical vapor deposition (PVD);   

DOI  :  10.1016/j.jallcom.2020.155448

来源: Elsevier

【 摘 要 】

This study reports a high temperature fast annealing approach to tailor the microstructure of ZnMg-Zn bilayer coatings through a diffusion-driven phase transformation and to improve the adhesion strength and corrosion resistance, simultaneously. Selection of the appropriate annealing condition, 250 degrees C for 3 min, promotes the formation of MgZn2 on the topmost surface of the coating and Mg(2)Za(11) at the interface of ZnMg/Zn. This results to an increase of the adhesion strength from 65 MPa in the as-deposited condition to 82 MPa after annealing as well as a reduction in the corrosion current density from 0.91 to 0.52 mu A/cm(2), indicating enhanced corrosion resistance. The diffusion of the elements at high temperatures is also modeled to predict the stability region of phases during the annealing treatment. An excellent correlation is obtained between simulation and the experimental results. (C) 2020 The Author(s). Published by Elsevier B.V.

【 授权许可】

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