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 5

Defects rating as per ISO norms 4628 (parts 1-4) in the virgin epoxy coating and titanium-embedded epoxy coatings after natural exposure testing.

Test stations	Coating systems	Defects observed after natural exposure testing
		3 months			6 months			9 months
		B	R	Cr	B	R	Cr	B	R	Cr
NIO	T0	2S3	1	0	2S4	2	0	3S5	3	0
	T5	0	0	0	2S3	1	0	2S4	2	0
	T10	0	0	0	0	1	0	2S2	2	0
KPT	T0	2S2	0	0	2S3	1	0	3S4	2	0
	T5	0	0	0	2S2	0	0	3S3	1	0
	T10	0	0	0	0	1	0	1S1	1	0

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