Corrosion Behavior of Automotive Cold Rolled Steels DC06 and DP600 in NaHSO3 Solution

doi:10.11902/1005.4537.2016.213

Journal of Chinese Society for Corrosion and protection

2017, Vol. 37

Issue (2): 155-161 DOI: 10.11902/1005.4537.2016.213

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Corrosion Behavior of Automotive Cold Rolled Steels DC06 and DP600 in NaHSO₃ Solution

Zhixiao XU¹(

),Herong ZHOU²(

),Wang YAO²

1 Process Technology Department, HangYu Lifesaving Equipment Co. Ltd, Xiangyang 441003, China
2 School of Material and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China

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Abstract

The corrosion behavior of automotive cold rolled steels DC06 and DP600 in 0.02 mol/L NaHSO₃ solution was studied by full immersion test, mass loss method and electrochemical impedance spectroscopy, as well as SEM and EDS. The results showed that the corrosion product continuously grew, while the mass loss value increased with the extending test time. The corrosion product presents agglomerate- and uneven fluctuant-morphology, which was composed of iron oxides and sulfate. The electrochemical impedance spectroscopy results revealed that the corrosion rate of low carbon steel DC06 and dual phase steel DP600 increased first and then decreased, and then gradually stabilized.

Key words: cold rolled steel full immersion test mass loss polarization curve electrochemical impedance spectroscopy

Received: 01 November 2016

Fund: Supported by National Natural Science Foundation of China (50971048) and National Science and TechnologyFoundation Platform Project

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Cite this article:

Zhixiao XU,Herong ZHOU,Wang YAO. Corrosion Behavior of Automotive Cold Rolled Steels DC06 and DP600 in NaHSO₃ Solution. Journal of Chinese Society for Corrosion and protection, 2017, 37(2): 155-161.

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https://www.jcscp.org/EN/10.11902/1005.4537.2016.213 OR https://www.jcscp.org/EN/Y2017/V37/I2/155

Table 1 Chemical compositions of DC06 and DP600 steels (mass fraction / %)

Fig.1 Surface (a, c) and cross-section (c, d) structures of two cold rolled steels DC06 (a, b) and DP600 (c, d) steels

Fig.2 Changes of corrosion mass loss of DC06 and DP600 steels with immersion time

Table 2 Fitting values of A and n according to equation (1)

Fig.3 Macro corrosion morphologies of DC06 steel after immersion in 0.02 mol/L NaHSO₃ solution for 120 h (a), 360 h (b) and 720 h (c)

Fig.4 Surface morphologies of DC06 steel after immersion in 0.02 mol/L NaHSO₃ solution for 120 h (a) and 720 h (b), and EDS analysis result of dot 1 in Fig.4b (c)

Fig.5 Macro corrosion morphologies of DP600 steel after immersion in 0.02 mol/L NaHSO₃ solution for 120 h (a), 360 h (b) and 720 h (c)

Fig.6 Surface morphologies and energy spectrum of DP600 steel after immersion in 0.02 mol/L NaHSO₃ solution for 120 h (a) and 720 h (b), magnified image of Fig.6b (c) and EDS result of dot 1 in Fig.6c (d)

Fig.7 Polarization curves of DC06 and DP600 steels in 0.02 mol/L NaHSO₃ solution

Fig.8 Nyquist plots of DC06 (a) and DP600 (b) steels in 0.02 mol/L NaHSO₃ solution

Fig.9 Equivalent circuits of EIS of DC06 and DP600 steels: (a) initial corrosion, (b) middle and late corrosion

Fig.10 Corrosion rates of DC06 and DP600 steels in 0.02 mol/L NaHSO₃solution as a function of time

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