Table 2.

Analysis of DEIS Nyquist chart for copper specimen immersed in SCW in inhibited and uninhibited state at time interval of 2 h, 6 h and 24 h.

Time interval/concentration	First spectra		2 h		6 h		12 h		24 h
	Yo	Rct	Yo	Rct	Yo	Rct	Yo	Rct	Yo	Rct
Blank	951.7	19,406	315.8	11,532	156.1	12,620	133.6	14,930	112.3	20,730
2000 ppm	97.7	9297	32.09	25,070	17.67	31,200	11.47	35,770	8.09	41,610
% IE	–	–	–	54.01	–	59.55	–	58.26	–	50.18

Unit for R_{ct is} (Ω cm²) and Y_o is (µΩsⁿ m⁻²).