海水流速对经抛光和钝化表面处理的<strong>2205</strong>不锈钢点蚀的影响

doi:10.11902/1005.4537.2023.208

中国腐蚀与防护学报

2024, Vol. 44

Issue (3): 658-668 CSTR: 32134.14.1005.4537.2023.208 DOI: 10.11902/1005.4537.2023.208

研究报告

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海水流速对经抛光和钝化表面处理的2205不锈钢点蚀的影响

邢少华¹, 彭文山¹(

), 钱峣¹^,², 李相波¹, 马力¹, 张大磊³

1.中国船舶集团有限公司第七二五研究所海洋腐蚀与防护全国重点实验室青岛 266237
2.青岛市即墨区工业和信息化局青岛 266205
3.中国石油大学(华东)材料科学与工程学院青岛 266580

Effect of Seawater Flow Velocity on Pitting Corrosion of 2205 Stainless Steel with Different Surface Treatments

XING Shaohua¹, PENG Wenshan¹(

), QIAN Yao¹^,², LI Xiangbo¹, MA Li¹, ZHANG Dalei³

1. National Key Laboratory of Marine Corrosion and Protection, Luoyang Ship Material Research Institute, Qingdao 266237, China
2. Qingdao Jimo District Bureau of Industry and Information Technology, Qingdao 266205, China
3. School of Materials Science and Engineering, China University of Petroleum(East China), Qingdao 266580, China

引用本文:

邢少华, 彭文山, 钱峣, 李相波, 马力, 张大磊. 海水流速对经抛光和钝化表面处理的2205不锈钢点蚀的影响[J]. 中国腐蚀与防护学报, 2024, 44(3): 658-668.
Shaohua XING, Wenshan PENG, Yao QIAN, Xiangbo LI, Li MA, Dalei ZHANG. Effect of Seawater Flow Velocity on Pitting Corrosion of 2205 Stainless Steel with Different Surface Treatments[J]. Journal of Chinese Society for Corrosion and protection, 2024, 44(3): 658-668.

全文: PDF(12438 KB) HTML

摘要:

采用动电位极化曲线、电化学阻抗谱以及Mott-Schottky曲线等电化学测试方法研究了2205不锈钢管路材料在流动海水中的耐点蚀性能，并对测试后的试样进行了腐蚀形貌观察。结果表明，抛光状态和钝化状态下，试样表面均出现了明显的点蚀形貌，点蚀电位在0.9~1.2 V之间。在静态环境中材料的耐点蚀性要强于流动海水中；随着流速上升，材料的耐点蚀性并未发生明显变化，但表面钝化膜在流动海水中失去了再钝化能力。2205不锈钢表面钝化膜呈现n型和p型两种半导体特征，说明不锈钢表面钝化膜呈现双层结构，主要由外层Fe的氧化物和内层Cr的氧化物组成。钝化处理后试样的耐点蚀性能有所上升，但钝化膜的半导体性质未发生明显变化。海水冲刷使得不锈钢耐点蚀性能下降，不同表面处理的2205不锈钢在海水冲刷下表面钝化膜特性差异导致不锈钢点蚀敏感性不同。

关键词 ： 2205不锈钢, 海水管路, 冲刷腐蚀, 电化学, 点蚀, 钝化膜

Abstract：

2205 stainless steel is commonly used in pipeline systems. In the presence of flowing seawater the failure of passivation film on tubing can easily lead to accidents such as pipeline leakage. Therefore, it is of great significance to acquire the impact of flowing seawater on the pitting corrosion behavior of 2205 stainless steel with different surface treatments. Hence, 2205 stainless steel was firstly subjected to polish-treatment and passivation-treatment respectively, and then the pitting behavior of which in flowing seawater was assessed by means of electrochemical testing methods such as potentiodynamic polarization curve, electrochemical impedance spectroscopy, and Mott-Schottky curve as well as characterization of their morphology variation with corrosion process. It was found that there were obvious pits formed on the surface of either the polished or passivated steel, with pitting potentials ranging from 0.9 V to 1.2 V. The pitting resistance of the steel is higher in static seawater rather than in flowing seawater, but as the flow rate increases, the pitting resistance of the steel does not change significantly, however, the surface passivation film loses its re-passivation ability in flowing seawater. The passivation film on the surface of 2205 stainless steel exhibits two semiconductor characteristics: n-type and p-type, indicating that the passivation film presents a double-layer structure, mainly composed of oxides of Fe (outer portion) and Cr (inner portion). After passivation treatment, the pitting corrosion resistance of the steel increased, but the semiconductor properties of the passivation film did not show significant changes. The flowing seawater could reduce the pitting corrosion resistance of the steel, but the difference in the surface passivation film characteristics of the steel pre-treated by two methods could result in different sensitivity to pitting corrosion of the 2205 stainless steel in flowing seawaters.

Key words： 2205 stainless steel seawater pipeline erosion corrosion electrochemistry pitting corrosion passivation film

收稿日期: 2023-06-30 32134.14.1005.4537.2023.208

ZTFLH:

TG172

通讯作者: 彭文山，E-mail: pengwenshan1386@126.com，研究方向为海洋环境腐蚀、多相流冲蚀及腐蚀/冲蚀仿真

Corresponding author: PENG Wenshan, E-mail: pengwenshan1386@126.com

作者简介: 邢少华，男，1981年生，博士，高级工程师

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https://www.jcscp.org/CN/10.11902/1005.4537.2023.208 或 https://www.jcscp.org/CN/Y2024/V44/I3/658

图1 抛光和钝化处理的2205不锈钢在不同流速海水中的动电位极化曲线

图2 抛光和钝化处理的2205不锈钢的点蚀电位和流速的关系

表1 静态海水环境中2205不锈钢点蚀保护电位和滞后环大小

图3 经抛光和钝化处理的2205不锈钢在流动海水中的极化曲线

图4 不同流速海水中抛光处理2205不锈钢的电化学阻抗谱图

图5 不锈钢试样的EIS拟合等效电路

表2 流动海水下抛光处理2205不锈钢电化学阻抗谱拟合数据

图6 不同海水流速下钝化处理2205不锈钢的电化学阻抗谱

表3 流动海水下钝化处理2205不锈钢电化学阻抗谱拟合数据

图7 两种表面状态2205不锈钢在不同流速海水中的Mott-Schottky曲线

图8 两种表面状态2205不锈钢在不同流速海水中的受主密度和施主密度对比

图9 抛光处理试样在不同流速海水中点蚀坑的三维形貌

图10 钝化处理试样在不同流速海水中点蚀坑的三维形貌

图11 抛光2205不锈钢试样在不同流速海水中点蚀坑的SEM形貌

表4 抛光处理2205不锈钢试样在不同流速海水中腐蚀表面元素组成 (atomic fraction / %)

图12 钝化2205不锈钢试样在不同流速海水中点蚀坑的SEM形貌

表5 钝化处理2205不锈钢试样在不同流速海水中腐蚀表面元素组成 (atomic fraction / %)

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