Effect of Microstructures and Textures on Different Surfaces on Corrosion Behavior of an as-Extruded ATZ411 Magnesium Alloy Sheet

doi:10.1007/s40195-021-01203-7

Abstract

Abstract:

The effect of textures on different surfaces of an as-extruded Mg-4Al-1Sn-1Zn (ATZ411) alloy sheet on its corrosion behavior was systematically investigated. The microstructure was examined by optical/scanning electron microscopy. The texture was characterized by X-ray diffraction and electron backscatter diffraction. The corrosion performance was evaluated by immersion tests, electrochemical measurements, and corrosion morphology observation. The results showed that there were obvious differences in the corrosion morphology and corrosion resistance on different surfaces. The surface perpendicular to extrusion direction had better corrosion resistance and more uniform corrosion damage than that perpendicular to the normal direction and that perpendicular to the transverse direction in 3.5 wt% NaCl solution. The corrosion morphology was mainly determined by the distribution of the second phase and fine-grained regions. The corrosion rate was more related to the overall texture.

Key words: Corrosion behavior, Micro-galvanic, Magnesium, alloys, Texture, Extrusion

Shuai Zhang, Bao-Chang Liu, Mei-Xuan Li, Hui-Yuan Wang, Yin-Long Ma. Effect of Microstructures and Textures on Different Surfaces on Corrosion Behavior of an as-Extruded ATZ411 Magnesium Alloy Sheet[J]. Acta Metallurgica Sinica (English Letters), 2021, 34(8): 1029-1041.

Figures/Tables 19

Table 1 Chemical composition of the ATZ411 alloy sheets (wt%)

Specimens	Al	Sn	Zn	Mn	Fe	Cu	Ni	Mg
1	3.6612	0.8543	0.6832	0.4829	0.0014	0.002	0.0008	Bal
2	3.7252	0.8335	0.6387	0.4256	0.0023	0.0019	0.0007	Bal
3	3.695	0.8576	0.677	0.4845	0.0014	0.002	0.0007	Bal
Average	3.6938	0.8485	0.6663	0.4644	0.0017	0.002	0.0007	Bal

Fig. 1 Schematic diagram of extruded ATZ411 alloy sheets

Fig. 2 OM images of the microstructure of ATZ411 alloy: a EDS, b NDS, c TDS; grain size distribution histograms of d EDS, e NDS, f TDS

Fig. 3 SEM images of the microstructure of ATZ411 alloy: a EDS, b NDS, c TDS; elemental mapping analysis of extruded ATZ411 alloy d

Table 2 EDS analysis of phases in Fig. 1(a-c

Spectrum points	Chemical composition (at.%)
Spectrum points	Mg	Al	Mn	Zn	Sn	Others
1	25.90 ± 0.17	37.01 ± 0.21	18.56 ± 0.17	/	/	18.54 ± 0.26
2	0.69 ± 0.07	46.41 ± 0.28	46.01 ± 0.32	0.39 ± 0.10	0.11 ± 0.03	6.40 ± 0.18
3	75.56 ± 0.26	11.74 ± 0.16	2.17 ± 0.07	/	2.12 ± 0.04	8.41 ± 0.15

Fig. 4 X-ray diffraction patterns of EDS, NDS, and TDS of ATZ411 alloys

Fig. 5 (0001)/(10-10) pole figures and grain orientation schematics of the three surfaces: a, d TDS; b, e NDS; c, f EDS

Fig. 6 a Hydrogen evolution rates as a function of immersion time a, and b average mass loss rate of the EDS, NDS, and TDS specimens in 3.5 wt% NaCl at 25?±?1 °C

Table 3 Converted annual corrosion rate (evaluated from the weight loss rate) for EDS, NDS, and TDS specimens in 3.5 wt% NaCl at 25?±?1 °C

Specimens	Corrosion rate (mm/y)
EDS	1.738 ± 0.018
NDS	3.03 ± 0.029
TDS	2.761 ± 0.026

Fig. 7 Macromorphologies of EDS, TDS, and NDS samples after immersed in 3.5 wt% NaCl solutions for 72 h

Fig. 8 OCP of the ATZ411 alloy sheets with different surfaces in 3.5 wt% NaCl for 1800s

Fig. 9 a A schematic polarization curve of extruded ATZ411 alloys, b polarization curve of extruded ATZ411 alloys after immersion in 3.5 wt% NaCl at 25?±?1 °C

Table 4 Values of E corr, I corr and βC extracted from the polarization curves of EDS, TDS, and NDS in 3.5 wt% NaCl at 25?±?1 °C

Specimens	E_corr (V_SCE)	I_corr (μA·cm^-2)	β_C (mV·dec^-1)
EDS	- 1.551 ± 0.001	61.37 ± 2.89	- 155.4 ± 0.63
TDS	- 1.529 ± 0.003	95.28 ± 1.78	- 172.9 ± 0.12
NDS	- 1.547 ± 0.001	133.35 ± 2.94	- 203.6 ± 0.30

Fig. 10 a EIS in Nyquist plots of ATZ411 alloys in 3.5 wt% NaCl, b the equivalent circuit used for fitting the EIS

Table 5 Fitting results for EIS in 3.5 wt% NaCl at 25?±?1 °C

Specimens	R_S (Ω cm²)	Q_dl (S secⁿ cm^-2)	n	R_t (Ω cm²)	R_{L Mg+} (Ω cm²)	L_Mg+ (H cm^-2)
EDS	10.15	1.906E-5	0.811	957.6	1566.0	705.0
TDS	10.35	1.416E-5	0.899	597.1	789.9	217.1
NDS	14.34	1.520E-5	0.879	418.2	737.1	192.1

Fig. 11 Typical corrosion morphologies of ATZ411 alloys after immersion testing for 1 day in 3.5 wt% NaCl at 25?±?1 °C: a, d EDS; b, e TDS; c, f NDS

Fig. 12 Typical corrosion morphologies of the NDS surface of the grain boundary was exposed in advance after immersion testing for 1 h in 3.5 wt% NaCl at 25?±?1 °C

Fig. 13 EBSD results obtained from two typical samples: a NDS, b EDS

Fig. 14 Schematic diagram of the corrosion attack cases on different textured surfaces of ATZ411 alloy

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