Galvanic corrosion behavior of friction stir welded AZ31B magnesium alloy and 6N01 aluminum alloy dissimilar joints
Journal
Corrosion Science
Journal Volume
180
Date Issued
2021
Author(s)
Lin Y.-J
Abstract
The corrosion behavior and corrosion rate of friction stir welded AZ31B magnesium alloy and 6N01 aluminum alloy dissimilar joints were studied using real-time imaging, potentiodynamic polarization, EIS, and hydrogen evolution tests. The corrosion rate was found to increase, in order, Al base metal (BM-6N01) < Mg base metal (BM-AZ31B) < stirred zone. The galvanic coupling of the Mg phase to the other phases enhanced the corrosion of both BM-AZ31B and BM-6N01. Accompanying the intense corrosion at BM-AZ31B, water reduction on the cathodic particles of BM-6N01 elevated the interfacial pH to a level where the Al matrix corroded to AlO2?. ? 2020 Elsevier Ltd
Subjects
Aluminum corrosion; Corrosion rate; Corrosive effects; Friction; Friction stir welding; Galvanic corrosion; Magnesium alloys; 6N01 aluminum alloys; AZ31B magnesium alloys; Corrosion behavior; Dissimilar joints; Galvanic corrosion behavior; Galvanic coupling; Hydrogen evolution; Realtime imaging; Aluminum alloys
SDGs
Type
journal article