No Cover Image

Journal article 425 views 40 downloads

Corrosion Performance of Friction Stir Linear Lap Welded AM60B Joints / J. R. Kish; N. Birbilis; E. M. McNally; C. F. Glover; X. Zhang; J. R. McDermid; G. Williams; Geraint Williams

JOM

Swansea University Author: Geraint, Williams

Abstract

A corrosion investigation of friction stir linear lap welded AM60B joints used to fabricate an Mg alloy-intensive automotive front end sub-assembly was performed. The stir zone exhibited a slightly refined grain size and significant break-up and re-distribution of the divorced Mg17Al12 (β-phase) rel...

Full description

Published in: JOM
ISSN: 1047-4838 1543-1851
Published: 2017
Online Access: Check full text

URI: https://cronfa.swan.ac.uk/Record/cronfa34759
Tags: Add Tag
No Tags, Be the first to tag this record!
Abstract: A corrosion investigation of friction stir linear lap welded AM60B joints used to fabricate an Mg alloy-intensive automotive front end sub-assembly was performed. The stir zone exhibited a slightly refined grain size and significant break-up and re-distribution of the divorced Mg17Al12 (β-phase) relative to the base material. Exposures in NaCl (aq) environments revealed that the stir zone was more susceptible to localized corrosion than the base material. Scanning vibrating electrode technique measurements revealed differential galvanic activity across the joint. Anodic activity was confined to the stir zone surface and involved initiation and lateral propagation of localized filaments. Cathodic activity was initially confined to the base material surface, but was rapidly modified to include the cathodically-activated corrosion products in the filament wake. Site-specific surface analyses revealed that the corrosion observed across the welded joint was likely linked to variations in Al distribution across the surface film/metal interface.
College: College of Engineering