Electrochemical Estimation of the Corrosion Rate of Magnesium/Aluminium Alloys

Table 4

Average corrosion rate for samples immersed in 3.5 wt.% NaCl solution. Test duration was 6 hours for Mg metal and 10 days for AZ31, AZ80 and AZ91D alloys.

Material	Direct gravimetric measurements (mg cm^−2 d^-1)	Corrected gravimetric measurements (mg cm^−2 d^-1)	Electrochemical estimation (mg cm^−2 d^-1)
			Approach I	Approach II	Approach III
Mg	310	772	64	85	82
AZ31	5.5	8.1	3.5	4.7	4.5
AZ80	0.074	0.37	0.19	0.25	0.24
AZ91D	0.089	1.4	0.10	1.47	1.40