热轧高Ni高强钢的表面晶界特征和电化学行为

doi:10.11901/1005.3093.2013.700

材料研究学报

2014, Vol. 28

Issue (1): 67-74 DOI: 10.11901/1005.3093.2013.700

本期目录 | 过刊浏览

热轧高Ni高强钢的表面晶界特征和电化学行为

张蕾¹,吴素君¹(

),孙国进²,麻庆申³

1. 北京航空航天大学材料科学与工程学院北京 100191
2. 中国兵器科学研究院宁波分院宁波 315000
3. 首钢技术研究院北京 100041

Surface Grain Boundary Characteristics and Electrochemical Behavior of Hot Rolled High Ni High Strength Steel

Lei ZHANG¹,Sujun WU^1,^*(

),Guojin SUN²,Qingshen MA³

1. School of Materials Science and Engineering, Beihang University, Beijing 100191
2. Ningbo Branch of China Ordnance Science Research Institute, Ningbo 315000
3. Shougang Technology Research Institute, Beijing 100041

引用本文:

张蕾,吴素君,孙国进,麻庆申. 热轧高Ni高强钢的表面晶界特征和电化学行为[J]. 材料研究学报, 2014, 28(1): 67-74.
Lei ZHANG, Sujun WU, Guojin SUN, Qingshen MA. Surface Grain Boundary Characteristics and Electrochemical Behavior of Hot Rolled High Ni High Strength Steel[J]. Chinese Journal of Materials Research, 2014, 28(1): 67-74.

全文: PDF(3242 KB) HTML

摘要:

采用EBSD技术和原子力显微镜(AFM)测试了10CrNi5Mo高强钢热轧态和热处理态试样的表面晶界分布特征和微观形貌, 用模拟海水全浸实验方法及电化学阻抗谱技术测试了10CrNi5Mo高强钢在模拟海水中的腐蚀行为。结果表明: 热轧态试样表面具有更高比例的小角度晶界, 经硝酸酒精腐蚀后热处理态试样表面腐蚀更为均匀, 粗糙度更小。进行模拟海水全浸实验时热轧态试样呈现出更好的耐腐蚀性能, 浸泡中期阻抗值增大, 表面腐蚀产物与基体结合更为紧密, 能保护基体防止其与溶液发生电化学反应。

关键词 ：材料失效与保护, 高强钢, 原子力显微镜, 交流阻抗谱

Abstract：

The surface grain boundary distribution characteristics and microtopography of hot rolled and heat treated 10CrNi5Mo high strength steel were tested by EBSD technology and AFM. The corrosion behavior of 10CrNi5Mo high strength steel was investigated by full immersion tests and electrochemical impedance spectroscopy (EIS) in simulated seawater environment. The results show that there is higher proportion of low angle grain boundaries on the surface of hot rolled 10CrNi5Mo high strength steel than that of the heat treated specimen. The corrosion of the heat treated specimen is more uniform and the roughness is less than that of the hot rolled specimen after nital corrosion. In the full immersion tests in simulated seawater environment, the hot rolled 10CrNi5Mo high strength steel presents a better corrosion resistance. The impedance increased in the mid-stage of immersion tests. The integration of corrosion products on the surface and matrix metal is closer so that the corrosion products can prevent the electrochemical reaction between the matrix metal and solution.

Key words： materials failure and protection high strength steel AFM electrochemical impedance spectroscopy (EIS)

收稿日期: 2013-09-24

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https://www.cjmr.org/CN/10.11901/1005.3093.2013.700 或 https://www.cjmr.org/CN/Y2014/V28/I1/67

表1 10CrNi5Mo高强钢化学成分

图1 热轧态和热处理态试样经硝酸酒精腐蚀10 s后的AFM像

图2 不同状态试样经硝酸酒精腐蚀10 s后表面粗糙度

图3 热轧态和热处理态试样的表面EBSD图和位向分布

图4 热轧态和热处理态试样在3.5%NaCl 溶液中开路电位曲线

图5 热轧态和热处理态试样在3.5%NaCl溶液中的电化学阻抗谱及其局部放大图

图6 电化学阻抗谱测试模拟等效电路

表2 10CrNi5Mo高强钢在3.5%NaCl溶液中的等效电路参数

图7 热轧态和热处理态的双电层电容、电荷转移电阻随浸泡时间变化曲线

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