Corrosion Behavior of DP600 Dual Phase Steel in Two Accelerated Test Environments

doi:10.11901/1005.3093.2019.288

Chinese Journal of Materials Research

2019, Vol. 33

Issue (12): 897-908 DOI: 10.11901/1005.3093.2019.288

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Corrosion Behavior of DP600 Dual Phase Steel in Two Accelerated Test Environments

Liangxing LV¹,Herong ZHOU^1,²(

),Kui XIAO²,Jiayong DAN¹,Wang YAO¹,Lei WU¹,Kaixin DUAN³

1. School of Materials and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2. Key Laboratory of Corrosion and Protection，University of Science and Technology Beijing, Beijing 100083, China
3. Beijing Foton Daimler Automobile Company，Beijing 101400, China

Cite this article:

Liangxing LV,Herong ZHOU,Kui XIAO,Jiayong DAN,Wang YAO,Lei WU,Kaixin DUAN. Corrosion Behavior of DP600 Dual Phase Steel in Two Accelerated Test Environments. Chinese Journal of Materials Research, 2019, 33(12): 897-908.

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Abstract

Corrosion behavior of DP600 dual phase steel in two different accelerated test environments, namely neutral salt spray (NSS) test and cyclic salt spray corrosion test (CCT) was comparatively assessed by means of SEM, EDS, XRD and EIS. Results show that the corrosion mass loss of the steel in the two environments was gradually increased, and the amount of mass loss in CCT was higher than in NSS test. At the same time, there was no significant difference in the initial corrosion rate, however the maximum corrosion rate reached 1.89 g·m^-2·h^-1 (NSS) and 2.72 g·m^-2·h^-1(CCT) at 480 h respectively. The rust layer of the steel after the NSS test composed of Fe₃O₄, α-FeOOH, γ-FeOOH, δ-FeOOH and α-Fe₂O₃, besides, there existed significant amount of β-FeOOH for the rust layer of the steel after CCT test. The rust layer of the steel after CCT test is thicker than that after NSS test, whilst the thickness increases faster for the former rust layer. The EIS results show that the resistance of sample solution and corrosion product film are gradually increased in both accelerated tests, furthermore the charge transfer resistance decreased first and then increased. The corrosion rate of the steel during NSS test and CCT test can be described as: ΔD_1-1=0.7349 $t 0.1522$ and ΔD_2-1=0.3511 $t 0.3313$ for the early stage (t≤480 h), while ΔD_1-2=14.6239 $t - 0.3236$ and ΔD_2-2=6.8542 $t - 0.157$ for the later stage (t>480 h) respectively.

Key words: metallic materials dual phase steel neutral salt spray test cyclic salt spray corrosion test corrosion rate model

Received: 04 June 2019

ZTFLH:

TG172.3

Fund: National Natural Science Foundation of China(50971048);National Science and Technology Basic Condition Platform Construction Topic

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	Liangxing LV
	Herong ZHOU
	Kui XIAO
	Jiayong DAN
	Wang YAO
	Lei WU
	Kaixin DUAN

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https://www.cjmr.org/EN/10.11901/1005.3093.2019.288 OR https://www.cjmr.org/EN/Y2019/V33/I12/897

Table 1 Chemical composition of DP600 dual phase steel (mass fraction, %)

Fig.1 Metallographic structures of DP600 dual phase steel, (a) rolling section; (b) longitudinal section

Fig.2 Variations of (a) mass loss and (b) corrosion rate of DP600 dual phase steel in NSS and CCT accelerated tests

Table 2 Fitting correlation parameter of corrosion kinetics

Fig.3 Surface morphologies of DP600 dual phase steel after (a, b, c) NSS and (d, e, f) tests for (a, d) 240 h, (b, e) 720 h and (c, f) 1200 h

Fig.6 XRD patterns of DP600 dual phase steel after (a) NSS and (b) CCT tests for 1200 h

Fig.4 Cross sections and elemental line scannings of DP600 dual phase steel after NSS tests for (a, b) 240 h, (c, d) 720 h and (e, f) 1200 h

Fig.5 Cross sections and elemental line scannings of DP600 dual phase steel after CCT tests for (a, b) 240 h, (c, d) 720 h and (e, f) 1200 h

Fig.7 Raman spectroscopies of the rust layers formed on DP600 dual phase steel after (a, b, c) NSS and (d, e, f) CCT tests for different time

Fig.8 Electrochemical impedance spectroscopies of DP600 dual phase steel after (a) NSS and (b) CCT tests for different time

Fig.9 Equivalent circuit diagrams of EIS of DP600 dual phase steel: (a) R(Q(RW)); (b) R(Q(R(Q(RW))))

Table 3 Fitting results of EIS of DP600 dual phase steel after NSS test for different time

Table 4 Fitting results of EIS of DP600 dual phase steel after CCT test for different time

Fig.10 Comparison of the fitted corrosion kinetics laws and test data

Fig.11 Flow chart of (a) NSS and (b) CCT acceleration tests

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