Effects of UV on the Corrosion Behavior of Pure Aluminum 1060 in Simulated Nansha Marine Atmosphere

doi:10.1007/s40195-021-01337-8

Abstract

Abstract:

The corrosion behavior of pure aluminum 1060 subjected to a wet-dry cyclic accelerated test in simulated Nansha marine atmosphere in the dark and under UV illumination has been investigated by means of scanning electron microscopy (SEM), electrochemical impedance spectroscopy (EIS), and Mott-Schottky measurements in this work. The results show that under the two conditions, the native oxide films are constantly destroyed and the thicknesses of the oxide films continuously decrease in the first 24 days of the corrosion test. In particular, UV illumination can diminish the pitting corrosion susceptibility of the native oxide films to an extent in terms of a photo-induced modification of the native oxide film on the pure aluminum surfaces. Besides, UV illumination can also reduce the carrier concentration in the oxide films, thus reducing the conductivity and the corrosion rate.

Key words: Aluminum, Atmospheric corrosion, UV illumination, Electrochemical impedance spectroscopy

Can Peng, Mingxiao Guo, Tianzhen Gu, Xiaohan Li, Chuan Wang, Zhenyao Wang, Cheng Sun. Effects of UV on the Corrosion Behavior of Pure Aluminum 1060 in Simulated Nansha Marine Atmosphere[J]. Acta Metallurgica Sinica (English Letters), 2022, 35(7): 1207-1220.

Figures/Tables 18

Table 1 Chemical compositions of pure aluminum 1060 (wt%)

Si	Fe	Cu	Mn	Mg	Zn	Ti	Al
0.13	0.15	0.03	0.01	0.01	0.02	0.01	Bal.

Fig. 1 Schematic diagram of the wet-dry cyclic accelerated test

Fig. 2 Change of the relative humidity and the temperature in the climate test chamber

Fig. 3 Surface morphologies of the corrosion products formed on pure aluminum 1060 after different exposed times in the dark: a, b 8 days; c, d 16 days; e, f 24 days; g, h 32 days; i, j 40 days

Fig. 4 Surface morphologies of the corrosion products formed on pure aluminum 1060 after different exposed times under UV illumination: a-b 8 days; c-d 16 days; e-f 24 days; g-h 32 days; i-j 40 days

Fig. 5 Surface morphologies of pure aluminum 1060 after removing corrosion products in the dark for 8 days a, 16 days b, 24 days c, 32 days d, 40 days e

Fig. 6 Surface morphologies of pure aluminum 1060 after removing corrosion products under UV illumination for 8 days a, 16 days b, 24 days c, 32 days d, 40 days e

Fig. 7 Evolution of the corrosion coverage fraction during corrosion test in the dark and under UV illumination

Fig. 8 Changes of polarization resistance (Rp) with exposure time in the dark and under UV illumination

Fig. 9 Nyquist plots a and Bode plots b after different exposed time in the dark. The solid lines in black represent the fitted results

Fig. 10 Nyquist plots a and Bode plots b after different exposed time under UV illumination. The solid lines in black represent the fitted results

Fig. 11 Corresponding equivalent circuits in the dark and under UV illumination: a equivalent circuit for the samples after 8 days, 16 days and 24 days of exposure in the dark; b equivalent circuit for the samples after 32 days and 40 days of exposure in the dark and under UV illumination all the time

Fig. 12 Time evolution of the calculated EIS parameters during exposed in simulated Nansha marine atmosphere in the dark and under UV illumination

Table 2 Fitted electrochemical parameters of pure aluminum 1060 after 8 days, 16 days, 24 days, 32 days and 40 days of exposure in the dark and under UV illumination in simulated Nansha marine atmosphere

Exposure time (days)	R_s (Ω cm²)	CPE_o (F/s^(1-ⁿf⁾ cm²)	n_f	R_o (Ω cm²)	CPE_dl (F/s^(1-ⁿ²⁾ cm²)	n2	R_ct (Ω cm²)	R_L (Ω cm²)	L	Σχ² × 10^-3
8	17.78	3.82	0.87	1.75 × 10³	5.23	0.83	1.32 × 10⁵	1.87 × 10⁵	1.28 × 10⁶	1.21
16	26.31	8.93	0.80	3.55 × 10³	4.07	0.88	2.80 × 10⁴	8.80 × 10⁴	2.01 × 10⁵	0.60
24	21.20	10.13	0.92	4.96 × 10³	4.96	1	2.84 × 10³	4.54 × 10²	3.99 × 10³	1.28
32	31.86	5.24	0.78	5.16 × 10²	5.63	0.88	1.58 × 10⁵	-	-	0.39
40	19.30	2.83	0.78	6.52 × 10²	5.83	0.92	1.30 × 10⁶	-	-	1.15
UV-8	11.62	3.51	0.77	1.16 × 10³	5.93	0.86	1.41 × 10⁶			2.03
UV-16	17.04	5.10	0.76	2.76 × 10²	6.92	0.87	1.05 × 10⁶	-	-	1.87
UV-24	15.19	3.93	0.77	6.31 × 10²	5.31	0.90	4.34 × 10⁵	-	-	4.50
UV-32	21.72	5.10	0.77	2.46 × 10²	9.39	0.85	2.97 × 10⁵	-	-	1.40
UV-40	15.12	4.60	0.72	6.74 × 10²	8.21	0.85	6.00 × 10⁵	-	-	2.46

Fig. 13 Polarization curves of pure aluminum 1060 exposed for different time

Fig. 14 Mott-Schottky plots of the pure aluminum 1060 after 2 days of exposure in the dark and under UV illumination in simulated Nansha marine atmosphere

Fig. 15 Capacitance-potential curves at different conditions: a in the dark; b under UV illumination

Table 3 Values of surface charge of pure aluminum 1060 under different conditions

Conditions	E_corr (mV)	PZC (mV)	Ψc (mV)
In the dark	- 669.1	- 757.9	88.8
Under UV illumination	- 679.5	- 712.9	33.4

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