Table 5: Grey relational analyses for corrosion potential and corrosion current density.

Sl. no.Normalized value Δ valueGrey coefficient
Ecorr Icorr Ecorr Icorr Ecorr Icorr

10.175050.000000.824951.000000.377370.33333
20.703800.998040.296200.001960.627990.99609
30.570710.999380.429290.000620.538050.99877
40.100620.682240.899380.317760.357300.61142
51.000000.995550.000000.004451.000000.99117
60.635580.992510.364420.007490.578420.98524
70.673920.999790.326080.000210.605270.99958
80.688500.994640.311500.005360.616140.98940
90.544700.973780.455300.026220.523390.95018
100.065720.264540.934280.735460.348610.40471
110.125140.957590.874860.042410.363670.92181
120.664360.964100.335640.035900.598340.93300
130.246420.977840.753580.022160.398860.95756
140.581720.899470.418280.100530.544500.83260
150.930841.000000.069160.000000.878491.00000
160.359190.597870.640810.402130.438290.55425
170.782950.985200.217050.014800.697310.97126
180.785330.995600.214670.004400.699630.99128
190.909160.993050.090840.006950.846250.98630
200.441280.926430.558720.073570.472270.87173
210.821080.744110.178920.255890.736470.66147
220.536750.893030.463250.106970.519080.82376
230.000000.771261.000000.228740.333330.68612
240.798430.996010.201570.003990.712680.99208
250.630690.882550.369310.117450.575170.80978
260.562340.997210.437660.002790.533240.99446
270.553450.939130.446550.060870.528240.89148