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

Table 2

Corrosion rate of copper in 0.5 M PO⁴³⁻ solutions in the absence or presence of different concentrations of 1-Butyl-4-methylpyridinium tetrafluoroborate (4MBPBF₄) of pH 2 and 4.

Concentration of 1-Butyl-4-methylpyridinium tetrafluoroborate; (mM)	𝑘𝑟 (mm/year)
	pH 2	pH 4
0	0.67	0.46
1.0	0.37	0.23
5.0	0.31	0.18
10.0	0.24	0.12
25.0	0.15	0.08
50.0	0.06	0.03