Corrosion Inhibition of Cu-Ni (90/10) Alloy in Seawater and Sulphide-Polluted Seawater Environments by 1,2,3-Benzotriazole

Table 9

Impedance parameters of Cu-Ni (90/10) alloy in seawater containing 10 ppm of inorganic sulphide and prefilmed alloy in the presence of 3.33 mM BTAH in seawater containing 10 ppm of inorganic sulphide at different temperatures. (Immersion period: 48 h).

Specimen	Environment	Temperature	𝑅ct	(CPE)dl	𝑛1	𝑅film	(CPE)film	𝑛2	IE (%)
			(kΩ cm^2)	(𝜇F cm^−2)		(kΩ cm^2)	(𝜇F cm^−2)
Bare alloy	Seawater +; 10 ppm sulphide	40	0.390	168.8	0.58	0.002	434.6	0.57	—
Prefilmed alloy	Seawater +; 10 ppm sulphide +; 3.33 mM BTAH	40	612.7	0.788	0.79	250.9	0.920	0.73	99.94
Bare alloy	Seawater +; 10 ppm sulphide	60	0.184	256.1	0.54	0.002	525.6	0.54	—
Prefilmed alloy	Seawater +; 10 ppm sulphide; 3.33 mM BTAH	60	398.8	1.033	0.73	223.5	2.621	0.76	99.95