Effect of Alloying Elements on Initial Corrosion Behavior of Aluminum Alloy in Bangkok, Thailand

doi:10.11900/0412.1961.2019.00217

Acta Metall Sin

2020, Vol. 56

Issue (1): 119-128 DOI: 10.11900/0412.1961.2019.00217

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Effect of Alloying Elements on Initial Corrosion Behavior of Aluminum Alloy in Bangkok, Thailand

WANG Li¹,DONG Chaofang¹(

),ZHANG Dawei¹,SUN Xiaoguang²,Chowwanonthapunya Thee³,MAN Cheng⁴,XIAO Kui¹,LI Xiaogang¹(

)

1. Corrosion and Protection Center, University of Science and Technology Beijing, Beijing 100083, China
2. CRRC Qingdao Sifang Co. , Ltd. , Qingdao 266111, China
3. Faculty of International Maritime Studies, Kasetsart University, Chonburi 20230, Thailand
4. School of Materials Science and Engineering, Ocean University of China, Qingdao 266100, China

Cite this article:

WANG Li,DONG Chaofang,ZHANG Dawei,SUN Xiaoguang,Chowwanonthapunya Thee,MAN Cheng,XIAO Kui,LI Xiaogang. Effect of Alloying Elements on Initial Corrosion Behavior of Aluminum Alloy in Bangkok, Thailand. Acta Metall Sin, 2020, 56(1): 119-128.

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Abstract

With the rapid development of rail transit, high-speed trains are gradually exported to Southeast Asian countries. Aluminum alloy is widely used as a structural material such as train body and rail beam in high-speed trains, so that it is important to study the corrosion behavior of different aluminum alloy in Southeast Asia. The exposure test was conducted on 5083, 6063 and 7020 aluminum alloys in Bangkok, Thailand for 1 a. SEM, XPS, electrochemical experiment and scanning Kelvin probe force microscopy (SKPFM) were used to study the corrosion morphology and corrosion mechanism of different aluminum alloys. The results showed that the corrosion potential of 6063 aluminum alloys were relatively high, about -0.66 V (vs SCE), and the corrosion morphologies were relatively mild, which was due to less alloy elements such as Mg, Si and Fe in the 6063 aluminum alloys. The corrosion rate of 6063 aluminum alloys in Bangkok, Thailand was about 0.7 g/(m²·a). 7020 aluminum alloy contains more Zn elements, and the corrosion potential was about -0.78 V (vs SCE). The corrosion rate was the highest, about 3.26 g/(m²·a). The second phase of Fe-Si-Al or Fe-Si(Mn)-Al formed in the microstructure of the three aluminum alloys. The surface potential of the second phase was higher than that of the matrix, about 225~280 mV. In the atmospheric environment, the second phase acted as the cathode phase, and the surrounding matrix Al dissolved preferentially. The second phase fell off and formed a pit.

Key words: aluminum alloy Bangkok Thailand atmospheric corrosion pitting

Received: 03 July 2019

ZTFLH:

TG146.2

Fund: National Key Research and Development Program of China(2017YFB0702300);National Natural Science Foundation of China(51871028);National Material Environmental Corrosion Platform Project(2005DKA10400)

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	Articles by authors
	Li WANG
	Chaofang DONG
	Dawei ZHANG
	Xiaoguang SUN
	Thee Chowwanonthapunya
	Cheng MAN
	Kui XIAO
	Xiaogang LI

URL:

https://www.ams.org.cn/EN/10.11900/0412.1961.2019.00217 OR https://www.ams.org.cn/EN/Y2020/V56/I1/119

Table 1 Chemical compositions of experimental materials (mass fraction / %)

Fig.1 EBSD images of 5083 (a), 6063 (b) and 7020 (c) Al alloys

Fig.2 The macro morphologies (a~c) and OM images (d~f) of 5083 (a, d)、6063 (b, e) and 7020 (c, f) Al alloys exposured in atmospheric enviroment in Bangkok area for 1 a

Fig.3 The micro surface (a~c) and cross-sectional (d~f) SEM images of 5083 (a, d), 6063 (b, e) and 7020 (c, f) Al alloys exposured in atmospheric enviroment in Bangkok area for 1 a

Fig.4 Polarization curves (in 0.1 mol/L NaCl solution at room temperature) of different Al alloys exposed in Bangkok area for 1 a (E_pit—pitting potential, E_corr—corrosion potential)

Fig.5 Electrochemical impedance spectroscopy (EIS, in 0.1 mol/L NaCl solution at room temperature) of 5083, 6063和7020 Al alloys exposed in Bangkok area for 1 a(a) Nyquist plot (b) Bode plot

Fig.6 Electrochemical equivalent circuit of EIS (R_e—solution resistance, CPE₁—electrochemical response of the passivation film, R₁—hindrance of passivation film to ion migration, CPE₂—electrochemical potential of the electric double layer, R₂—corresponding charge transfer resistance, Q and n are the admittance value and fitted exponential of CPE, respectively)

Al alloy

R_e

Ω·cm²

R₁

Ω·cm²

Q₁

Ω^-1·cm^-2· $s n 1$

R₂

Ω·cm²

Q₂

Ω^-1·cm^-2· $s n 2$

5083

25.31

2.249×10⁶

7.041×10^-6

65.60

2.633×10^-6

6063

66.08

4.077×10⁶

6.094×10^-7

13.69

7.406×10^-6

7020

65.96

8.233×10⁵

6.094×10^-6

54.69

7.573×10^-6

Table2 Values of parameters observed from the EIS diagrams

Fig.7 XPS results of 5083, 6063 and 7020 Al alloys(a) Al2p (b) O1s (c) Fe2p (d) Mg1s (e) Zn2p

Fig.8 Pitting morphologies and surface scan results of 5083 (a), 6063 (b) and 7020 (c) Al alloys

Fig.9 SEM image of Fe-Si(Mn)-Al (a) and EDS surface scan results of Al (b), Si (c), Fe (d) and Mn (e), and scanning Kelvin probe force microscopy (SKPFM) results (surface potential (f), surface potential of Line 1 in Fig.9f (g))

Fig.10 SEM image of Fe-Si-Al (a), and EDS surface scan results of Al (b), Si (c) and Fe (d), and SKPFM result (surface potential (e), surface potential of Line 2 in Fig.10e (f))

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