Table 9 Optimal ai-coefficients values obtained by non linear regression for Eq. 44 with second polynomial degree for glassy Ni82.3Cr7Fe3Si4.5B3.2 alloy corrosion for the three polyacids HCl, H2SO4 and H3PO4.

From: Effect of acid proticity on the thermodynamic parameters of charge transfer resistance in corrosion and passivation of nickel based glass alloy

Acid

a0

a1

a2

R-square

 

J  K−1  mol−1

J  mol−1

J  K  mol−1

–

HCl

− 16.768

− 212,423

4.29865e + 7

0.99935

H2SO4

− 170.621

− 148,531

3.76016e + 7

0.99992

H3PO4

− 352.116

− 51,109.9

2.50234e + 7

0.99766

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