抄録
The effect of surface treatment on corrosion behavior of AZ91D diecast magnesium alloy coated with epoxy resin has been investigated by salt spraying test. The corrosion test results revealed that corrosion under the epoxy coating was inhibited in all samples subjected to surface treatment, and corrosion was observed to develop from cross-cuts. The maximum corrosion width increased in the following order of surface treatments; stannating, chromating and phosphating. The corrosion resistance of uncoated magnesium alloy correlated well with the maximum corrosion width. The corrosion behavior of magnesium alloy coated with epoxy resin is discussed in terms of a galvanic model in the same way as for uncoated magnesium alloy.
