Corrosion Protection of AA2024-T3 by Cerium Malate and Cerium Malate-Doped Sol-Gel Coatings

doi:10.1007/s40195-018-0846-x

Abstract

Abstract:

Cerium malate (CeMal) was tested as a corrosion inhibitor for AA2024-T3 in this work. Corrosion inhibition on bare AA2024-T3 indicated that the inhibiting effect was a result of the synergistic effect of cerium cations and maleic anions. The corrosion of AA2024-T3 was stagnated by greatly reducing the corrosion current when CeMal was present in NaCl solutions. CeMal was adsorbed on the surface of AA2024-T3 forming a protective film in the initial stage. Then, cerium cations transformed to cerium oxide/hydroxides, precipitating on the cathode sites to inhibit the further corrosion. The electrochemical impedance spectra results of the sol-gel coatings proved that CeMal was an effective corrosion inhibitor in the sol-gel coatings to provide corrosion protection for AA2024-T3.

Key words: AA2024-T3, Corrosion inhibitor, Sol-gel coatings, Scanning vibrating electrode technique (SVET), Electrochemical impedance spectroscopy (EIS)

Tian-Hui Hu, Hong-Wei Shi, Tao Wei, Shi-Hua Fan, Fu-Chun Liu, En-Hou Han. Corrosion Protection of AA2024-T3 by Cerium Malate and Cerium Malate-Doped Sol-Gel Coatings[J]. Acta Metallurgica Sinica (English Letters), 2019, 32(7): 913-924.

Figures/Tables 12

Fig. 1 SEM images of polished AA2024-T3 samples after 1 day of immersion in a 0.05 mol/L NaCl solution, b 0.05 mol/L NaCl solution with saturated CeMal

Fig. 2 Polarization curves for AA2024-T3 samples immersed in 0.05 mol/L NaCl solution, 0.05 mol/L NaCl solution with 0.018 mol/L NaMal, 0.012 mol/L CeCl3 or saturated CeMal

Fig. 3 XPS spectra of component a Ce 3d, b Al 2p on the bare AA2024-T3 after 24 h of immersion in 0.05 mol/L NaCl solution with saturated CeMal

Fig. 4 FT-IR spectra of a CeMal powder and ATR-FTIR spectra of b CeMal on AA2024-T3 sample surface

Fig. 5 Polarization curves for AA2024-T3 samples immersed in a blank 0.05 mol/L NaCl solution and 0.05 mol/L NaCl solution with saturated CeMal for different times, b Nyquist plot for AA2024-T3 sample immersed in blank 0.05 mol/L NaCl solution and 0.05 mol/L NaCl solution with saturated CeMal for different times

Fig. 6 SVET maps over the sample after a 0 h, b 10 h, c 24 h of immersion, d optical photograph of bare AA2024-T3 after 24 h of immersion in 0.05 mol/L NaCl solution

Fig. 7 SVET maps over the sample after a 0 h, b 12 h, c 24 h of immersion, d optical photograph of bare AA2024-T3 after 24 h of immersion in 0.05 mol/L NaCl solution with saturated CeMal

Fig. 8 SEM images of the surface of the samples coated with a reference, c E-CeMal, e S-CeMal sol-gel coatings, and cross section of the samples coated with b reference, d E-CeMal, f S-CeMal sol-gel coatings

Fig. 9 SEM images of the surface of the samples coated with a reference, b E-CeMal, c S-CeMal sol-gel coatings after 3 days of immersion in 0.005 mol/L NaCl solution

Fig. 10 Bode plots of the samples coated with a, b reference, c, d E-CeMal, e, f S-CeMal sol-gel coatings during immersion in 0.005 mol/L NaCl solution

Fig. 11 Equivalent electrical circuits containing a two time constants, b three time constants

Table 1 Circuit parameters fitted from the EIS data of the sol-gel coatings during immersion in 0.005 mol/L NaCl solution

Sample	Time (h)	R_c (ohm cm²)	Q_c (S cm^-2 sⁿ)	n _c	R_o (ohm cm²)	Q_o (S cm^-2 sⁿ)	n _o	R_ct (ohm cm²)	Q_dl (S cm^-2 sⁿ)	n _dl
Reference	0	3.81?×?10⁴	1.25?×?10^-7	0.78	3.50?×?10⁷	3.26?×?10^-6	0.80
	8	1.51?×?10⁴	1.91?×?10^-7	0.75	1.54?×?10⁶	4.07?×?10^-6	0.84
	24	6.19?×?10³	5.51?×?10^-7	0.67	2.51?×?10⁵	5.60?×?10^-6	0.83
	96	9.28?×?10²	1.61?×?10^-6	0.56	7.45?×?10³	1.14?×?10^-5	0.77	1.65?×?10⁴	3.27?×?10^-5	0.85
	168	7.53?×?10²	1.34?×?10^-6	0.53	2.78?×?10³	8.78?×?10^-6	0.84	1.73?×?10⁴	1.36?×?10^-5	0.88
E-CeMal	0	8.01?×?10³	2.58?×?10^-7	0.71	2.22?×?10⁶	2.33?×?10^-6	0.88
	8	5.29?×?10³	2.36?×?10^-7	0.73	7.78?×?10⁵	5.31?×?10^-6	0.76
	24	4.14?×?10³	2.17?×?10^-7	0.74	1.16?×?10⁶	5.93?×?10^-6	0.77
	96	2.19?×?10³	3.11?×?10^-7	0.72	9.59?×?10⁵	5.63?×?10^-6	0.79
	168	1.27?×?10³	5.70?×?10^-7	0.66	5.42?×?10⁵	5.30?×?10^-6	0.80
S-CeMal	0	3.17?×?10⁴	4.09?×?10^-8	0.82	3.14?×?10⁷	3.41?×?10^-6	0.86
	8	1.83?×?10⁴	5.26?×?10^-8	0.81	8.95?×?10⁶	3.86?×?10^-6	0.87
	24	7.27?×?10³	9.64?×?10^-8	0.76	9.24?×?10⁵	4.87?×?10^-6	0.82
	96	3.13?×?10³	2.15?×?10^-7	0.71	4.15?×?10⁵	5.17?×?10^-6	0.85
	168	1.98?×?10³	3.77?×?10^-7	0.65	2.86?×?10⁵	5.47?×?10^-6	0.83

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