Table 5.

Main components of the surface of each coupon before and after the exposure tests (mass %).

Coupon	Test Type	Element
		Fe	Cu	Zn	Ca	Si
SS400	before	100	0	0	0	0
	outdoor exposure	99.98	0	0	0.02	0
	water exposure	98.41	0	0	0.36	1.23
Cu-coated	before	0.68	99.01	0	0	0.31
	outdoor exposure	6.27	93.73	0	0	0
	water exposure	11.34	77.95	0	8.46	2.25
Zn-coated	before	0.09	0	99.52	0	0.39
	outdoor exposure	0.13	0	99.17	0	0.70
	water exposure	0.33	0	90.23	2.84	6.60