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Table 3 Tafel parameters of aluminum and electrolytically colored aluminum samplesNi, Ni + Cu and Cu at constant anodization time 30 min

From: Electrodeposition of nano-Cu, Ni and binary Ni/Cu into nano-porous AAO layer for high-efficiency black spectrally selective coating

Sample

Coloring time (min)

βa (V/dec)

βc (V/dec)

Ecorr. (V)

Jcorr. (μA/cm2)

Corrosion rate (mm/year)

Polarization resistance (KΩ)

Al substrate

125.67

106.99

− 800.61

7.5914

0.08603

3.1803

Al colored by Ni

30

220.1700

319.55

− 723.28

3.7446

0.04082

3.2004

Al colored by Ni + Cu

30

118.0990

190.24

− 728.09

2.3794

0.06594

2.0165

Al colored by Cu

30

23.6590

262.91

− 718.54

7.8257

0.09114

1.4446