Role of Atmospheric Aerosol Content on Atmospheric Corrosion of Metallic Materials

Table 1

Corrosivity category of metals acc. to NBR 14643 [11, 12].

Corrosivity category	Corrosion rates of metals
	Units	Carbon steel	Zinc	Copper	Aluminum
C1 (very low)	g m^-2 y^-1	0-10	0-0.7	0-0.9	Negligible
	μm y^-1	0-1.3	0-0.1	0-0.1
C2 (low)	g m^-2 y^-1	10-200	0.7-5	0.9-5	0-0.6
	μm y^-1	1.3-25	0.1-0.7	0.1-0.6
C3 (medium)	g m^-2 y^-1	200-400	5-15	5-12	0.6-2
	μm y^-1	25-50	0.7-2.1	0.6-1.3
C4 (high)	g m^-2 y^-1	400-650	15-30	12-25	2-5
	μm y^-1	50-80	2.1-4.2	1.3-2.8
C5 (very high)	g m^-2 y^-1	650-1500	30-60	25-50	5-10
	μm y^-1	80-200	4.2-8.4	2.8-5.6