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Simulation of galvanic corrosion of magnesium coupled to a steel fastener in NaCl solution

✍ Scribed by J. X. Jia; A. Atrens; G. Song; T. H. Muster

Publisher: John Wiley and Sons
Year: 2005
Tongue: German
Weight: 503 KB
Volume: 56
Category: Article
ISSN: 0947-5117
DOI: 10.1002/maco.200403855

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✦ Synopsis

The galvanic corrosion of magnesium alloy AZ91D coupled to a steel fastener was studied using a boundary element method (BEM) model and experimental measurements. The BEM model used the measured polarization curves as boundary conditions. The experimental program involved measuring the total corrosion rate as a function of distance from the interface of the magnesium in the form of a sheet containing a mild steel circular insert (5 to 30 mm in diameter). The measured total corrosion rate was inter-preted as due to galvanic corrosion plus self corrosion. For a typical case, the self corrosion was estimated typically to be $ 230 mm/y for an area surrounding the interface and to a distance of about 1 cm from the interface. Scanning Kelvin Probe Force Microscopy (SKPFM) revealed microgalvanic cells with potential differences of approximately 100 mV across the AZ91D surface. These microgalvanic cells may influence the relative contributions of galvanic and self corrosion to the total corrosion of AZ91D.

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