Research Article

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

Table 6

Slope ( 𝑏 ), linear correlation coefficient ( 𝑅 2 ), equilibrium constant ( 𝐾 ), and standard free energy of adsorption ( Δ 𝐺 0 a d s ) in 0.5 M P O 4 3 of 1-Butyl-4-methylpyridinium tetrafluoroborate (4MBPBF4) solutions of pH 2 and 4.

pHb 𝑅 2 𝐾 ( M 1 ) Δ 𝐺 0 a d s (kJ mol−1)

21.000.99982.2 × 102−23.3
41.010.99983.8 × 102−24.7