热轧AH36船板钢在室内仓储条件下的腐蚀行为研究

doi:10.11902/1005.4537.2019.219

中国腐蚀与防护学报

2020, Vol. 40

Issue (1): 10-16 DOI: 10.11902/1005.4537.2019.219

研究报告

本期目录 | 过刊浏览

热轧AH36船板钢在室内仓储条件下的腐蚀行为研究

范益¹,陈林恒¹,蔡佳兴¹,代芹芹¹,马宏驰^1,²(

),程学群²

1. 南京钢铁股份有限公司江苏省高端钢铁材料重点实验室南京 210035
2. 北京科技大学新材料技术研究院教育部腐蚀与防护重点实验室北京 100083

Corrosion Behavior of Hot-rolled AH36 Plate in Indoor Storage Environment

FAN Yi¹,CHEN Linheng¹,CAI Jiaxing¹,DAi Qinqin¹,MA Hongchi^1,²(

),CHENG Xuequn²

1. Jiangsu Key Laboratory for Premium Steel Materials, Nanjing Iron & Steel United Co. , Ltd. , Nanjing 210035, China
2. Key Laboratory for Corrosion and Protection (MOE), Institute for Advanced Materials and Technology, University of Science and Technology Beijing, Beijing 100083, China

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摘要:

采用两种典型热轧氧化皮钢板在某钢厂仓库中进行现场挂样，通过连续拍照跟踪试样锈蚀状况，同时记录仓库内部温、湿度环境参数，并采用增重法评价钢板锈蚀量的方法，研究带氧化皮热轧钢板在室内仓储条件下的腐蚀行为与规律。结果表明，AH36钢热轧氧化皮可提高钢的腐蚀电位，大幅降低腐蚀电流密度，特别是青黑色氧化皮由于较厚较致密，具有更好的耐蚀性。在平均温度和湿度分别为23.4 °C和72%的室内仓储条件下，AH36钢青色氧化皮经过119 d开始出现少量鼓泡，红色氧化皮经119 d开始出现明显的红色锈斑，119 d之后锈蚀面积迅速增加；截面形貌显示经过69 d的室内暴露后，氧化皮底部已形成2~3 μm的腐蚀产物膜，氧化皮特别是红色氧化皮内部出现明显的疏松孔洞和微裂纹，且随着暴露时间的延长，腐蚀失厚119 d之前近似呈幂指数增加，119 d之后基本呈线性增加。

关键词 ：热轧氧化皮, AH36钢, 船板钢, 室内仓储环境, 大气腐蚀

Abstract：

To provide guideline for storage period and hot roll process, field corrosion behavior of hot-rolled AH36 steel with two typical oxide scales, namely the black and red ones respectively, were investigated in storage environment. Corrosion loss was calculated and corrosion morphologies and environmental conditions were continuously monitored. Results revealed that the oxide scale of AH36 steel could increase the corrosion potential and greatly decrease the corrosion current density. Moreover, corrosion resistance of the black oxide scale is superior to that of the red one due to its thicker and more compact scale. The black scale started to blister while the red one exhibited apparent rust staining after exposure for 119 d in storage environment with relative humidity of 72% at c.a. 23.4 ℃. Corrosion area was enlarged rapidly after 119 d exposure for both samples. Cross-sectional morphologies revealed that corrosion has already occurred and a thickness of 2~3 μm of corrosion products has been formed at the interface of oxide scale and substrate. Meanwhile, apparent voids and microcracks appeared in oxide scale, especially for the red one. Moreover, corrosion depth approximately obeyed exponential growth within the first stage of 119 d and hereafter increased almost linearly.

Key words： hot-rolled oxide scale AH36 steel shipbuilding steel indoor storage environment atmospheric corrosion

收稿日期: 2019-05-28

ZTFLH:

TG172.3

通讯作者: 马宏驰 E-mail: mahongchi128@163.com

Corresponding author: Hongchi MA E-mail: mahongchi128@163.com

作者简介: 范益，男，1980年生，博士，高级工程师

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引用本文:

范益,陈林恒,蔡佳兴,代芹芹,马宏驰,程学群. 热轧AH36船板钢在室内仓储条件下的腐蚀行为研究[J]. 中国腐蚀与防护学报, 2020, 40(1): 10-16.
Yi FAN, Linheng CHEN, Jiaxing CAI, Qinqin DAi, Hongchi MA, Xuequn CHENG. Corrosion Behavior of Hot-rolled AH36 Plate in Indoor Storage Environment. Journal of Chinese Society for Corrosion and protection, 2020, 40(1): 10-16.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.219 或 https://www.jcscp.org/CN/Y2020/V40/I1/10

图1 AH36钢两种典型氧化皮宏观形貌

图2 AH36钢两种氧化皮热轧氧化皮表面微观形貌

图3 AH36钢两种氧化皮热轧氧化皮截面微观形貌

图4 AH36裸钢和带氧化皮试样的动电位极化曲线

表1 AH36裸钢和不同氧化皮试样拟合得到的腐蚀电位和腐蚀电流密度

图5 AH36钢青色氧化皮在室内仓库存放不同时间的宏观腐蚀形貌

图6 AH36钢红色氧化皮在室内仓库存放不同时间的宏观腐蚀形貌

图7 AH36钢青色和红色氧化皮试样在仓库中的腐蚀失厚随暴露时间的关系曲线

图8 暴露182 d期间仓库内的温度和相对湿度

图9 AH36钢青色和红色氧化皮在仓库现场暴露69 d后的截面形貌

图10 AH36钢两种氧化皮在仓库现场暴露69 d后的截面成分面分布

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