Inhibition Effect of 1-Butyl-4-Methylpyridinium Tetrafluoroborate on the Corrosion of Copper in Phosphate Solutions

Table 5

Surface coverage of copper electrode in 0.5 M PO⁴³⁻ solutions for different concentrations of 1-Butyl-4-methylpyridinium tetrafluoroborate (4MBPBF₄) for pH 2 and 4.

	Concentration
pH	1.0	5.0	10.0	25.0	50.0
	(mM), 1-Butyl-4-methylpyridinium tetrafluoroborate
2	0.45	0.55	0.64	0.78	0.92
4	0.50	0.63	0.75	0.82	0.94