Corrosion behaviour of as-cast ZK40 with CaO and Y additions

被引：17

作者：

Buzolin, Ricardo Henrique ^{[1
,2
]}

Mohedano, Marta ^{[1
,3
]}

Mendis, Chamini Lakshi ^{[1
,4
]}

Mingo, Beatriz ^{[3
]}

Tolnai, Domonkos ^{[1
]}

Blawert, Carsten ^{[1
]}

Kainer, Karl Ulrich ^{[1
]}

Pinto, Haroldo ^{[5
]}

Hort, Norbert ^{[1
]}

机构：

[1] Helmholtz Zentrum Geesthacht, Magnesium Innovat Ctr, Max Planck Str 1, D-21502 Geesthacht, Germany

[2] Graz Univ Technol, Inst Mat Sci Joining & Forming, Kopernikusgasse 24-1, A-8010 Graz, Austria

[3] Univ Complutense Madrid, Fac Ciencias Quim, Dept Ciencia Mat, Av Complutense S-N, E-28040 Madrid, Spain

[4] Brunel Univ London, Brunel Ctr Adv Solidificat Technol, Uxbridge UB8 3PH, Middx, England

[5] Univ Sao Paulo, Dept Mat Engn, Av Joao Dagnone,1100 Jd Sta Angelina, BR-13563120 Sao Carlos, SP, Brazil

来源：

TRANSACTIONS OF NONFERROUS METALS SOCIETY OF CHINA | 2018年 / 28卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

Mg alloy; ZK40; Y addition; CaO addition; corrosion behaviour; MECHANICAL-PROPERTIES; MG-ZN; MAGNESIUM ALLOYS; HIGH-STRENGTH; ZR ALLOYS; ORDERED STRUCTURE; MICROSTRUCTURE; AZ91; RESISTANCE; REFINEMENT;

D O I：

10.1016/S1003-6326(18)64676-X

中图分类号：

TF [冶金工业];

学科分类号：

0806 ;

摘要：

The microstructures of as-cast ZK40, ZK40 with 2% (mass fraction) CaO and ZK40 with 1% (mass fraction) Y were investigated, and the intermetallic phase morphology and the distribution were characterised. By having discrete intermetallic particles at the grain boundaries for the ZK40, the microstructure was modified to a semi-continuous network of intermetallic compounds along the grain boundaries for the ZK40 with CaO or Y additions. The CaO was not found in the microstructure. However, Ca was present in Ca2Mg6Zn3 intermetallic compounds which were formed during casting. Hydrogen evolution and electrochemical impedance spectroscopy tests revealed that the addition of CaO slightly enhanced the corrosion resistance whereas Y had a negative effect on the corrosion resistance of ZK40. Immersion tests showed that severe localised corrosion as well as corrosion along the intermetallic compounds played an important role in the corrosion process of ZK40-Y whereas the localised corrosion was not pronounced for ZK40 or ZK40-CaO alloys. Micro-segregation in the alpha-Mg matrix was notably higher for the ZK40 alloy compared with the modified alloys. The combination of this effect with a possible formation of a more stable corrosion layer for the ZK40-CaO was attributed as the main reason for an improved corrosion resistance for the ZK40-CaO alloy.

引用

页码：427 / 439

页数：13

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