2001 Volume 42 Issue 7 Pages 1243-1248
Corrosion behavior in magnesium coated AZ31 alloy prepared by vapor deposition technique was examined by means of in situ laser microscopic observations in 1% NaCl solution in comparison with those in 3N–Mg, 6N–Mg and uncoated AZ31 alloy. General corrosion and evolution of hydrogen bubbles at stationary points were observed in all the specimens. Filiform corrosion occurred in the AZ31 alloy and in the 3N–Mg, while it did not occur in the 6N–Mg and deposition coated specimen. General corrosion seemed to suppress the evolution of hydrogen bubbles in the 6N–Mg and deposition coated specimen. Superior corrosion resistance in the deposition coated specimen was confirmed, which is comparable to that in the 6N–Mg.