Investigation of Various Coating Resins for Optimal Anticorrosion and Mechanical Properties of Mild Steel Surface in NaCl Solution

Table 1

Technical specifications of resin.

Sl. No.	Resin specifications
	Epoxy	Polyurethane	Polyester	Phenolic
1	Color: clear and can be dyed as per the requirement	Color: colorless (PU500/A and PU500/B)	Viscosity range, MPa.s.@30°C:	Color:
			300–500	yellow
2	Finish: glossy	Finish: glossy	Acid value, mg of KOH/g: 10–20	Viscosity @25°C (B4 flow cup):
				30–40 sec
3	Mixing ratio	Mixing ratio (PU500A : PU500B) 1 : 1 (by weight)	Color, gardener:	Finish:
	Base : hardener = 2 : 1 (by volume)		<1	glossy
4	Pot life	Viscosity at 25°C:	Specific gravity:	Bond strength, at 30°C:
	14–16 hours @30°C	15 ± 5 MPa·s	1.10–1.12	25
5	Theoretical covering capacity: 12 sq.m./lit @25 microns dft.	Solid content:	Volatile content (max.):	Volume resistivity at 30°C:
		60 ± 2%	40	1–1.5 × 10^16 cm after immersion
6	Application method:	Application method:	—	—
	air-assisted/airless spray/brush	brush/Spray
7	—	Continuous operating temperature:	—	—
		155°C

denotes as supplied by the manufacturer.