Corrosion Resistance Synergistic Appraisal of Titanium-Impregnated Bisphenol A-Type Epoxy Duplex Coating System in Stimulated and Natural Marine Environments of Southeastern Coastal Area of China–Pakistan Economic Corridor

Table 6

Defect rating as per ISO norm 4628 (parts 1-4) in the virgin epoxy coating and titanium-embedded epoxy coatings after salt spray testing.

Coating systems	Duration of exposure and coating defects as per ISO norm 4628 (parts 1-4)
	61 hours			98 hours			126 hours			201 hours			260 hours
	B	R	Cr	B	R	Cr	B	R	Cr	B	R	Cr	B	R	Cr
T0	2S3	1	0	2S3	2	0	3S4	3	0	4S3	3	0	3S4	3	0
T5	0	0	0	1S1	0	0	3S2	1	0	2S3	1	0	3S3	2	0
T10	0	0	0	0	0	0	1S1	1	0	2S1	1	0	2S2	2	0

B: blistering; R: rusting; Cr: cracking; 0: no defect seen.