Stability analysis of the Mg2Si phase in AA 6061 aluminum alloy.

被引：46

作者：

Linardi, E. ^{[1
]}

Haddad, R. ^{[1
]}

Lanzani, L. ^{[1
]}

机构：

[1] Comis Nacl Energia Atom, Buenos Aires, DF, Argentina

来源：

11TH INTERNATIONAL CONGRESS ON METALLURGY & MATERIALS SAM/CONAMET 2011 | 2012年 / 1卷

关键词：

aluminum; AA; 6061; corrosion; Mg2Si phase; KH2PO4; NaOH; INTERMETALLIC PHASES; LOCALIZED CORROSION;

D O I：

10.1016/j.mspro.2012.06.074

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

The spent MTR fuel elements, manufactured with the aluminum-based alloy AA 6061, are stored under water in interim storage basins. In such conditions the AA 6061 is susceptible to degradation by localized corrosion processes which might be related to the behavior of second-phase particles present in the alloy. According to its electrochemical behavior, the second-phase particles present in AA 6061 can be classified into cathodic or anodic in relation to the aluminum matrix. In order to investigate the stability of the Mg2Si phase, which dissolves in high purity water, immersion and polarization tests were carried out in alkaline solutions. SEM and EDS were used to analyze the second-phase particles after the tests. It was determined that Mg2Si phase particles are stable in solutions of pH 8 to 14, and undergo selective magnesium dissolution from pH 7 to lower values. (C) 2012 Published by Elsevier Ltd. Selection and/or peer-review under responsibility of SAM/CONAMET 2011, Rosario, Argentina.

引用

页码：550 / 557

页数：8

共 14 条

[1] Localized alkaline corrosion of alloy AA5083 in neutral 3.5% NaCl solution [J].