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

Table 6

Slope (𝑏), linear correlation coefficient (𝑅²), equilibrium constant (𝐾), and standard free energy of adsorption (Δ𝐺⁰_ads) in 0.5 M PO⁴³⁻ of 1-Butyl-4-methylpyridinium tetrafluoroborate (4MBPBF₄) solutions of pH 2 and 4.

pH	b	𝑅^2	𝐾(M^−1)	Δ𝐺^0ads (kJ mol^−1)
2	1.00	0.9998	2.2 × 10^2	−23.3
4	1.01	0.9998	3.8 × 10^2	−24.7