DP600双相钢在两种盐雾实验条件下的腐蚀行为对比研究

doi:10.11901/1005.3093.2019.288

材料研究学报

2019, Vol. 33

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

研究论文

本期目录 | 过刊浏览

DP600双相钢在两种盐雾实验条件下的腐蚀行为对比研究

吕良兴¹,周和荣^1,²(

),肖葵²,但佳永¹,姚望¹,吴磊¹,段凯欣³

1. 武汉科技大学材料与冶金学院武汉 430081
2. 北京科技大学腐蚀与防护教育部重点实验室北京 100083
3. 北京福田戴姆勒汽车有限公司北京 101400

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

引用本文:

吕良兴,周和荣,肖葵,但佳永,姚望,吴磊,段凯欣. DP600双相钢在两种盐雾实验条件下的腐蚀行为对比研究[J]. 材料研究学报, 2019, 33(12): 897-908.
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[J]. Chinese Journal of Materials Research, 2019, 33(12): 897-908.

全文: PDF(9822 KB) HTML

摘要:

采用SEM、EDS、XRD以及EIS等技术，对比研究了DP600双相钢在中性盐雾(NSS)实验和循环盐雾腐蚀实验(CCT)两种不同加速实验条件下的腐蚀行为，并获得了腐蚀动力学规律。结果表明：在两种加速实验条件下，试样腐蚀失重均逐步增加，且CCT中的大于NSS中的；同时，初期腐蚀速率相差不大，在480 h时腐蚀速率均达到最大值，分别为1.89 g·m^-2·h^-1(NSS)和2.72 g·m^-2·h^-1(CCT)。两种实验条件下腐蚀产物主要是Fe₃O₄、α-FeOOH、γ-FeOOH、δ-FeOOH和α-Fe₂O₃，而CCT条件下同时也形成了较多的β-FeOOH。CCT条件下的锈层厚度大于NSS条件下的，且厚度增加趋势也更快。EIS结果表明：两种加速实验条件下试样溶液电阻和腐蚀产物膜电阻均逐步增大，电荷转移电阻均为先减小后增加。实验前期(≤480 h)，NSS和CCT条件下的腐蚀速率可分别表达为：ΔD_1-1=0.7349 $t 0.1522$ ，ΔD_2-1=0.3511 $t 0.3313$ ；而在实验后期(>480 h)，则分别为：ΔD_1-2=14.6239 $t - 0.3236$ ，ΔD_2-2=6.8542 $t - 0.1570$ 。

关键词 ：金属材料, 双相钢, 中性盐雾实验, 循环腐蚀实验, 腐蚀速率模型

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: 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

收稿日期: 2019-06-04

ZTFLH:

TG172.3

基金资助:国家自然科学基金(50971048);国家科技基础条件平台建设专题(汽车腐蚀专项)

作者简介: 吕良兴，男，1993年生，硕士生

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https://www.cjmr.org/CN/10.11901/1005.3093.2019.288 或 https://www.cjmr.org/CN/Y2019/V33/I12/897

表1 DP600双相钢主要化学成分(质量分数，%)

图1 DP600双相钢轧向截面和横向截面的金相组织

图2 DP600双相钢在两种加速实验条件下的腐蚀失重及腐蚀速率变化曲线

表2 腐蚀动力学拟合相关参数

图3 DP600双相钢在两种加速腐蚀实验后的表面形貌

图6 DP600双相钢在加速实验1200 h后腐蚀产物的XRD谱

图4 DP600双相钢试样在NSS实验后的截面形貌与EDS分析

图5 DP600双相钢试样在CCT实验后的截面形貌与EDS分析

图7 DP600钢在两种加速实验条件下腐蚀不同时间后表面锈层的拉曼光谱

图8 DP600双相钢在两种加速实验条件下腐蚀不同时间后的电化学阻抗谱

图9 DP600双相钢阻抗等效电路图

表3 DP600双相钢在NSS实验下电化学阻抗谱拟合结果

表4 DP600双相钢在CCT下电化学阻抗谱拟合结果

图10 两种加速实验条件下试样腐蚀速率拟合规律与测试数据的对比

图11 两种盐雾加速实验工作流程图

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