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Influence of Mg content on the sensitization and corrosion of Al-xMg(-Mn) alloys

Version 2 2024-05-30, 08:38
Version 1 2014-10-28, 10:25
journal contribution
posted on 2024-05-30, 08:38 authored by RK Gupta, R Zhang, CHJ Davies, Nick BirbilisNick Birbilis
The influence of Mg content on the degree of sensitization (DoS) of Al-xMg-0.5Mn (wt%) alloys (where x varies from 3.36 wt% to 8.85 wt%) was investigated via the nitric acid mass loss test (NAMLT). NAMLT upon sensitized specimens revealed that mass loss was negligible below ~4.01 wt% Mg, while for Mg content ≥4.01 wt%, mass loss increased monotonically. The calculated equilibrium β-phase fractions were contrast with the DoS values. Additionally, the influence of the Mg content on corrosion was investigated via potentiodynamic polarization testing, in conjunction with microhardness measurements. We found that Mg additions lead to an increase in hardness without causing any significant impact on electrochemically determined corrosion current density; however, Mg content has a major impact on intergranular corrosion as determined from NAMLT.

History

Journal

Corrosion

Volume

69

Pagination

1081-1087

Location

Houston, Tex.

ISSN

0010-9312

eISSN

1938-159X

Language

English

Publication classification

C1.1 Refereed article in a scholarly journal

Copyright notice

2013, NACE International

Issue

11

Publisher

NATL ASSOC CORROSION ENG