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Journal of Chinese Society for Corrosion and protection  2015, Vol. 35 Issue (4): 311-316    DOI: 10.11902/1005.4537.2014.106
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Corrosion Inhibition of L-Cysteine for AA5052 Al-alloy Anode in Alkaline Solution
Dapeng WANG,Lixin GAO,Daquan ZHANG()
School of Environmental and Chemical Engineering, Shanghai University of Electric Power, Shanghai 200090, China
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Abstract  

The corrosion behavior of AA5052 Al-alloy in 4 mol/L NaOH solution was investigated by means of mass loss method, measurements of hydrogen gas evolution,polarization curve and electrochemical impedance spectroscopy. It was found that the inhibitor of 30 mmol/L L-Cysteine exhibited the optimal corrosion inhibition performance. Moreover, the adsorption of the L-Cysteine on the Al-alloy surface obeyed the amended Langmuir's adsorption isotherm. The polarization curves indicated that the L-Cysteine inhibited the cathodic reaction and acted as a cathodic inhibitor. The inhibition mechanism was dominated by the geometric covering effect.
Key words:  corrosion inhibitor      AA5052 Al-alloy      L-Cysteine      NaOH solution     
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Dapeng WANG
Lixin GAO
Daquan ZHANG

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Dapeng WANG,Lixin GAO,Daquan ZHANG. Corrosion Inhibition of L-Cysteine for AA5052 Al-alloy Anode in Alkaline Solution. Journal of Chinese Society for Corrosion and protection, 2015, 35(4): 311-316.

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https://www.jcscp.org/EN/10.11902/1005.4537.2014.106     OR     https://www.jcscp.org/EN/Y2015/V35/I4/311

Fig.1  Hydrogen absorption amount vs time for AA5052 aluminum alloy during immersion in different solutions
Fig.2  Mass loss vs time for AA5052 aluminum alloy during immersion in different solutions
  
Table 1  Fitted parameters from C/θvsC curves
Temperature ℃ ΔH θ kJmol-1 ΔG θ kJmol-1 ΔS θ J / molK-1
20 -37.2 -19.8 -58.40
30 -42.3 -24.4 -59.76
40 -47.5 -28.9 -59.42
50 -50.2 -31.1 -59.13
Table 2  Thermodynamic parameters of the adsorption of L-Cysteine on AA5052 aluminum alloy in the solutions at different temperatures
Solution C mmolL-1 -Ecorr V -βc mVdec-1 Icorr mAcm-2
4 mol/L NaOH 0 1.5607 444.75 70.02
10 1.627 356.96 47.62
20 1.6261 383.64 42.87
30 1.6342 381.7 39.98
40 1.6375 347.51 35.74
Table 3  Electrochemical polarization parameters of AA5052 aluminum alloy in 4 mol/L NaOH solutions containing different concentrations of L-Cysteine
Fig.4  Linear regression curve of ln K vs T-1
Fig.5  Polarization curves of AA5052 aluminum alloy in 4 mol/L NaOH solutions containing different concentrations of L-Cysteine
Fig.6  Nyquist plots of AA5052 aluminum alloy in 4 mol/L NaOH solution containing different concentrations of L-Cysteine
Fig.7  Equivalent circuits of electrochemical impe-dance spectra: (a) blank, (b) with inhibitor
C mmolL-1 Rs Ωcm2 CPE1 Y0 (Ssncm-2) n (Rct)1 Ωcm2 L1 Hcm2 R1 Ωcm2 CPE2 Y0 (Ssncm-2) n (Rct)2 Ωcm2 L2 Hcm2 R2 Ωcm2
0 0.46 0.18 0.91 0.31 0.006 0.50 4.0×10-4 0.95 0.21 --- ---
10 0.51 0.09 0.94 0.45 0.049 0.55 2.5×10-4 0.87 0.39 3.1×10-3 1.433
20 0.48 0.07 0.88 0.64 0.042 0.58 2.5×10-4 0.91 0.42 2.8×10-3 1.971
30 0.49 0.09 0.91 0.78 0.041 0.64 2.4×10-4 0.84 0.41 2.9×10-3 1.843
40 0.52 0.07 0.82 0.84 0.081 0.72 2.3×10-4 0.92 0.43 3.9×10-3 2.152
Table 4  Fitted parameters of Nyquist plots of AA5052 aluminum alloy in 4 mol/L NaOH solutions containing different concentrations of L-Cysteine
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