Corrosion Behavior of DC06 Extra Deep Drawing Cold Rolled Steel in Neutral Salt Spray Test

doi:10.11902/1005.4537.2017.174

Journal of Chinese Society for Corrosion and protection

2018, Vol. 38

Issue (3): 241-247 DOI: 10.11902/1005.4537.2017.174

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Corrosion Behavior of DC06 Extra Deep Drawing Cold Rolled Steel in Neutral Salt Spray Test

Wang YAO¹(

), Herong ZHOU¹, Kui XIAO², Pengyang LIU¹, Jiayong DAN¹, Run WU¹

1 School of Material and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2 Key Laboratory of Corrosionan Protection (MOE), University of Science and Technology Beijing, Beijing 100083, China

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Abstract

The corrosion behavior of the extra deep drawing cold rolled sheet DC06 was assessed by means of neutral slat spray test, electrochemical impedance (EIS) measurement, macro photography, SEM and XRD. It follows that during the neutral slat spray test, the thickness of the corrosion products had increased significantly with the increasing time, and the color of the corrosion products changed from the original brown red to dark brown, while the surface morphology of the corrosion products also changed from needle-like clumps to cotton-like clumps. The corrosion products composed mainly of Fe₃O₄ plus α-FeOOH and γ-FeOOH. The electrical resistance of the electric double layer is decreasing with the test time. The interface corrosion rate increases and double layer resistance value is small. So that the protective effect of corrosion products is not obvious for the substrate steel.

Key words: neutral slat spray test condition extra deep drawing cold rolled sheet electrochemical impedance corrosion layer protection SEM

Received: 24 October 2017

ZTFLH:

TG172.3

Fund: Supported by National Natural Science Foundation of China (50971048) and National Science and Technology Foundation Platform Proiect

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Cite this article:

Wang YAO, Herong ZHOU, Kui XIAO, Pengyang LIU, Jiayong DAN, Run WU. Corrosion Behavior of DC06 Extra Deep Drawing Cold Rolled Steel in Neutral Salt Spray Test. Journal of Chinese Society for Corrosion and protection, 2018, 38(3): 241-247.

URL:

https://www.jcscp.org/EN/10.11902/1005.4537.2017.174 OR https://www.jcscp.org/EN/Y2018/V38/I3/241

Fig.1 Macroscopic surface images of DC06 steel after neutral salt spray test for 24 h (a), 48 h (b), 120 h (c), 240 h (d), 720 h (e) and 1200 h (f)

Fig.2 Microscopic corrosion morphologies of DC06 steel after corrosion in neutral salt spray test condition for 240 h (a, b), 720 h (c, d) and 1200 h (e, f)

Fig.3 Cross section morphologies of DC06 steel after corrosion in neutral salt spray test condition for 240 h (a), 720 h (b) and 1200 h (c)

Fig.4 XRD spectram of DC06 steel after neutral salt spray test for 1200 h

Fig.5 Nyquist (a) and phase angle (b) plots of DC06 steel after neutral slat spray test for different time

Fig.6 Equivalent circuit model (a) and simplified model (b) for DC06 steel during corrosion in neutral slat spray test

Table 1 Fitting electrochemical parameters of EIS of DC06 steel during neutral slat spray test

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