SAF 2304双相不锈钢电化学性能及其近海腐蚀行为

doi:10.11902/1005.4537.2022.217

中国腐蚀与防护学报

2023, Vol. 43

Issue (3): 630-638 CSTR: 32134.14.1005.4537.2022.217 DOI: 10.11902/1005.4537.2022.217

研究报告

本期目录 | 过刊浏览

SAF 2304双相不锈钢电化学性能及其近海腐蚀行为

黄家针¹^,², 黄涛², 杨丽景²(

), 季灯平³, 丁贺³, 韦一¹, 宋振纶²

^1.浙江工业大学化学工程学院杭州 310000
^2.中国科学院宁波材料技术与工程研究所中国科学院海洋新材料与应用技术重点实验室宁波 315201
^3.浙江青山钢铁有限公司丽水 323903

Electrochemical Properties and Offshore Corrosion Behavior of SAF 2304 Duplex Stainless Steel

HUANG Jiazhen¹^,², HUANG Tao², YANG Lijing²(

), JI Dengping³, DING He³, WEI Yi¹, SONG Zhenlun²

^1.College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310000, China
^2.Key Laboratory of Marine Materials and Related Technologies, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
^3.Zhejiang Qingshan Iron & Steel Co. Ltd., Lishui 323903, China

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摘要:

通过光学显微镜 (OM)、扫描电子显微镜 (SEM)、电化学实验，研究了双相不锈钢SAF 2304的电化学性能及实海腐蚀行为，并与碳钢做了对比。结果表明：碳钢的自腐蚀电位为-0.857 V_SCE，维钝电流密度为87.30 μA‧cm^-2，容抗弧半径较小，耐腐蚀性较差。SAF 2304在3.5%NaCl溶液的开路电位中长期稳定，自腐蚀电位为-0.369 V_SCE，维钝电流密度为18.03 μA‧cm^-2，容抗弧较大。实海暴露实验中，碳钢表面形成了疏松的腐蚀层，而SAF 2304表面在近海暴露前期形成了致密的金属氧化膜，并且随着暴露时间的增加，氧化膜表面附着了一层较为致密的钙镁沉积层和SiO₂，与不锈钢结合紧密，具有一定保护作用，腐蚀形貌表现为均匀腐蚀，腐蚀速率远小于碳钢，耐蚀性好。

关键词 ：双相不锈钢, 电化学, 实海, 腐蚀行为

Abstract：

Electrochemical properties and real-sea corrosion behavior of duplex stainless steel SAF 2304 in a test site located in the Zhoushan area of the East China Sea, with a depth of about 10 m were assessed by mean of mass loss measurement, electrochemical tests, optical microscopy (OM) and scanning electron microscopy (SEM) and compared with carbon steel. The electrochemical test results show that the free corrosion potential of carbon steel is -0.857 V_SCE, the passive current density is 87.30 μA‧cm^-2, the capacitive arc radius is small, and the corrosion resistance is poor. SAF 2304 duplex stainless steel is stable for a long time in the open circuit potential of 3.5%NaCl solution, the free corrosion potential is -0.369 V_SCE, the passive current density is 18.03 μA‧cm^-2, the capacity of the arc resistance is large, and the corrosion resistance is good. In the real sea exposure experiment, the corrosion rate of SAF 2304 duplex stainless steel is much smaller than that of carbon steel. With the increase of exposure time, a relatively compact scale composed of Ca and Mg containing deposits and SiO₂ may further form on the pre-formed metal oxide film, and all the corrosion products are tightly adhered to the substrate, therefore, provides protective effect to a certain extent for the steel, and the corrosion morphology is uniformly corroded.

Key words： duplex stainless steel electrochemistry real sea corrosion behavior

收稿日期: 2022-07-01 32134.14.1005.4537.2022.217

ZTFLH:

TG27

基金资助:浙江省科技计划项目(2022C01192);浙江省科技计划项目(2021C01082)

通讯作者: 杨丽景，E-mail：yanglj@nimte.ac.cn，研究方向为金属腐蚀与防护

Corresponding author: YANG Lijing, E-mail: yanglj@nimte.ac.cn

作者简介: 黄家针，男，1995年生，硕士生

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引用本文:

黄家针, 黄涛, 杨丽景, 季灯平, 丁贺, 韦一, 宋振纶. SAF 2304双相不锈钢电化学性能及其近海腐蚀行为[J]. 中国腐蚀与防护学报, 2023, 43(3): 630-638.
HUANG Jiazhen, HUANG Tao, YANG Lijing, JI Dengping, DING He, WEI Yi, SONG Zhenlun. Electrochemical Properties and Offshore Corrosion Behavior of SAF 2304 Duplex Stainless Steel. Journal of Chinese Society for Corrosion and protection, 2023, 43(3): 630-638.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2022.217 或 https://www.jcscp.org/CN/Y2023/V43/I3/630

图1 SAF 2304双相不锈钢XRD图谱

图2 SAF 2304双相不锈钢横截面和纵截面金相的光学显微组织及表面SEM形貌

图3 SAF 2304双相不锈钢在3.5%NaCl溶液中的开路电位

图4 碳钢和SAF 2304双相不锈钢在3.5%NaCl溶液中动电位极化曲线及阻抗谱

图5 碳钢和SAF 2304双相不锈钢在近海浸泡不同时间后的失重和增重速率

图6 碳钢近海浸泡不同时间后的腐蚀形貌

图7 SAF 2304双相不锈钢近海浸泡不同时间后的腐蚀形貌

表1 图6对应位置的表面EDS元素成分分析

表2 图7对应位置的表面EDS元素成分分析

图8 碳钢和SAF 2304双相不锈钢在舟山近海中浸泡12个月后的横截面腐蚀形貌和EDS能谱图

图9 碳钢近海浸泡不同时间后去除腐蚀产物后的表面形貌

图10 SAF 2304双相不锈钢近海浸泡不同时间后去除腐蚀产物后的表面形貌

图11 碳钢和SAF 2304双相不锈钢浸泡12个月后的腐蚀产物粉末XRD谱

图12 碳钢和SAF 2304双相不锈钢浸泡12个月后的腐蚀产物粉末FTIR谱

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