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Title: Effects of Variations in Salt-Spray Conditions on the Corrosion Mechanisms of an AE44 Magnesium Alloy

The understanding of how corrosion affects magnesium alloys is of utmost importance as the automotive and aerospace industries have become interested in the use of these lightweight alloys. However, the standardized salt-spray test does not produce adequate corrosion results when compared with field data, due to the lack of multiple exposure environments. This research explored four test combinations through three sets of cycles to determine how the corrosion mechanisms of pitting, intergranular corrosion, and general corrosion were affected by the environment. Of the four test combinations, Humidity-Drying was the least corrosive, while the most corrosive test condition was Salt Spray-Humidity-Drying. The differences in corrosivity of the test conditions are due to the various reactions needed to cause corrosion, including the presence of chloride ions to cause pit nucleation, the presence of humidity to cause galvanic corrosion, and the drying phase which trapped chloride ions beneath the corrosion by-products.
Authors:
 [1] ;  [1] ;  [1]
  1. Center for Advanced Vehicular Systems (CAVS), Mississippi State University (MSU), 200 Research Boulevard, Starkville, MS 39759, USA
Publication Date:
OSTI Identifier:
1198460
Grant/Contract Number:
FC26-02OR22910
Type:
Published Article
Journal Name:
International Journal of Corrosion
Additional Journal Information:
Journal Volume: 2010; Related Information: CHORUS Timestamp: 2016-08-11 13:15:50; Journal ID: ISSN 1687-9325
Publisher:
Hindawi Publishing Corporation
Sponsoring Org:
USDOE
Country of Publication:
Country unknown/Code not available
Language:
English