Studies on Corrosion Behavior of Mg-Al-Zn-RE Cast Alloy with Powder-Coated Al and CED Mg by Salt Spray Test, Immersion Test, and Electrochemical Test

Table 10

Corrosion rate of samples after 24, 48, 72, 96, and 120 hours.

AZ91D	24 h (mm/year)	48 h (mm/year)	72 h (mm/year)	96 h (mm/year)	120 h (mm/year)
As cast sample	48.15	47.75	46.01	45.67	45.87
Powder-coated sample	4.51	4.02	4.08	3.98	4.01
CED-coated sample	1.69	1.63	1.61	1.61	1.65