Inhibition Effect of Glycerol on the Corrosion of Copper in NaCl Solutions at Different pH Values

Table 1

Electrochemical parameters determined by Tafel extrapolation of the cathodic branch of the potentiodynamic polarization curves for copper in aerated NaCl (0.5 M) with and without glycerol at three pH values.

pH	Glycerol; (M)	𝐸corr; mV versus SCE	𝐼corr; μA·cm^−2	𝑏𝑐; mV·d^−1	𝑏𝑎; mV·d^−1	𝜂𝑇; %
pH 4	0.0	−243	5.27	−335	61.9	Blank
	0.1	−270	2.97	−201	66.7	43.6
	0.5	−275	2.69	−207	65.1	48.9
	1	−277	2.89	−208	65.9	45.1
	2	−281	1.98	−209	62.6	62.4
pH 7	0.0	−212	11.2	−575	64.1	Blank
	0.1	−206	6.57	−442	72.8	41.3
	0.5	−228	5.88	−313	103.0	47.5
	1	−217	5.19	−384	82.7	53.6
	2	−215	3.03	−215	93.2	72.9
pH 10	0.0	−208	9.7	−750	81.3	Blank
	0.1	−186	3.9	−261	161.3	60
	0.5	−203	2.3	−203	206.4	76.2
	1	−185	2.1	−208	205.0	78.1
	2	−213	1.6	−209	200.0	83.2