Corrosion Behavior of Riveted Pair of 6A01 Al-alloy-/304 Stainless Steel-plate Used for High-speed Train

doi:10.11902/1005.4537.2021.120

Journal of Chinese Society for Corrosion and protection

2022, Vol. 42

Issue (3): 507-512 DOI: 10.11902/1005.4537.2021.120

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Corrosion Behavior of Riveted Pair of 6A01 Al-alloy-/304 Stainless Steel-plate Used for High-speed Train

CHEN Zhijian¹, ZHOU Xuejie¹^,²(

), CHEN Hao¹^,³

^1.Wuhan Research Institute of Materials Protection, Wuhan 430030, China
^2.Wuhan Materials Corrosion National Observation and Research Station, Wuhan 430030, China
^3.Yuli Materials Corrosion National Observation and Research Station, Yuli 841500, China

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Abstract

The corrosion process of the riveted pair of 6A01 Al-alloy-/304 stainless steel-plate was assessed via cyclic salt spray test, aiming especially to clarify the corrosion behavior of the 6A01 Al-alloy, as the main component of the riveted pear. The corrosion kinetics, rust composition and corrosion morphology of the alloy samples were characterized by means of weightlessness method, scanning electron microscope (SEM), energy dispersive spectroscope (EDS), 3D super depth of field microscope and other methods. The results showed that galvanic corrosion and crevice corrosion occurred for the Al-alloy after being riveted onto 304 stainless steel, and its corrosion rate was 8-10 times higher than that of the blank alloy. The variation of corrosion products on the surface of Al-alloy may in turn affect the corrosion process of the Al-alloy. The cracking of the corrosion product can accelerate the corrosion process, whereas, the densification of the corrosion product may be beneficial to its protectiveness.

Key words: riveting parts 6A01 Al- alloy 304 stainless steel galvanic corrosion

Received: 28 May 2021

ZTFLH:

TG174

Corresponding Authors: ZHOU Xuejie E-mail: zhouxj11@163.com

About author: ZHOU Xuejie, E-mail: zhouxj11@163.com

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CHEN Zhijian, ZHOU Xuejie, CHEN Hao. Corrosion Behavior of Riveted Pair of 6A01 Al-alloy-/304 Stainless Steel-plate Used for High-speed Train. Journal of Chinese Society for Corrosion and protection, 2022, 42(3): 507-512.

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https://www.jcscp.org/EN/10.11902/1005.4537.2021.120 OR https://www.jcscp.org/EN/Y2022/V42/I3/507

Fig.1 Corrosion rates of 6A01 Al-alloy after corrosion for different time

Fig.2 Surface morphologies of 6A01 Al-alloy after cyclic salt spray experiment for 10 d (a), 20 d (b), 30 d (c), 40 d (d), 50 d (e) and 60 d (f)

Fig.3 Surface pitting pit morphologies of 6A01 Al-alloy lap joint after cyclic salt spray experiment for 10 d (deep 131 μm, width 485 μm) (a), 20 d (deep 185 μm, width 644 μm) (b), 30 d (deep 242 μm, width 323 μm) (c), 40 d (deep 245 μm, width 495 μm) (d) and 50 d (deep 321 μm, width 457 μm) (e)

Fig.4 Surface SEM images and EDS results after cyclic salt spray experiment 10 d (a), 20 d (b), 30 d (c), 40 d (d), 50 d (e) and 60 d (f)

Fig.5 XRD spectra of corrosion products of 6A01 Al- alloy after different salt spray cycles

Fig.6 Open circuit potential of 304 stainless steel and 6A0Al-alloy base material after cyclic salt spray experiment

Fig.7 Polarization curves of 6 groups of aluminum alloy after blank sample and cyclic salt spray experiment

Table 1 Tafel fitting data of polarization curves

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