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DP600雙相鋼在兩種鹽霧實驗條件下的腐蝕行為對比研究

2021-04-19 13:57:56 作者：呂良興來源：材料研究學報分享至：

DP600雙相鋼在兩種鹽霧實驗條件下的腐蝕行為對比研究

呂良興, 周和榮，肖葵, 但佳永, 姚望, 吳磊, 段凱欣

1. 武漢科技大學材料與冶金學院武漢 430081

2. 北京科技大學腐蝕與防護教育部重點實驗室北京 100083

3. 北京福田戴姆勒汽車有限公司北京 101400

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

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

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

摘要

采用SEM、EDS、XRD以及EIS等技術，對比研究了DP600雙相鋼在中性鹽霧（NSS）實驗和循環鹽霧腐蝕實驗（CCT）兩種不同加速實驗條件下的腐蝕行為，并獲得了腐蝕動力學規律。結果表明：在兩種加速實驗條件下，試樣腐蝕失重均逐步增加，且CCT中的大于NSS中的；同時，初期腐蝕速率相差不大，在480 h時腐蝕速率均達到最大值，分別為1.89 g·m-2·h-1（NSS）和2.72 g·m-2·h-1（CCT）。兩種實驗條件下腐蝕產物主要是Fe3O4、α-FeOOH、γ-FeOOH、δ-FeOOH和α-Fe2O3，而CCT條件下同時也形成了較多的β-FeOOH。CCT條件下的銹層厚度大于NSS條件下的，且厚度增加趨勢也更快。EIS結果表明：兩種加速實驗條件下試樣溶液電阻和腐蝕產物膜電阻均逐步增大，電荷轉移電阻均為先減小后增加。實驗前期（≤480 h），NSS和CCT條件下的腐蝕速率可分別表達為：ΔD1-1=0.7349，ΔD2-1=0.3511；而在實驗后期（>480 h），則分別為：ΔD1-2=14.6239，ΔD2-2=6.8542。

關鍵詞：金屬材料 ; 雙相鋼 ; 中性鹽霧實驗 ; 循環腐蝕實驗 ; 腐蝕速率模型

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: ΔD1-1=0.7349 and ΔD2-1=0.3511 for the early stage （t≤480 h）， while ΔD1-2=14.6239 and ΔD2-2=6.8542 for the later stage （t>480 h） respectively.

Keywords： metallic materials ; dual phase steel ; neutral salt spray test ; cyclic salt spray corrosion test ; corrosion rate model