锅炉电极材料交流腐蚀特性与选型研究

doi:10.11902/1005.4537.2021.357

中国腐蚀与防护学报

2023, Vol. 43

Issue (1): 202-208 CSTR: 32134.14.1005.4537.2021.357 DOI: 10.11902/1005.4537.2021.357

研究报告

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锅炉电极材料交流腐蚀特性与选型研究

郑重¹, 周远翔¹^,²(

), 李永印¹

^1.新疆大学电气工程学院电力系统及大型发电设备安全控制和仿真国家重点实验室风光储分室乌鲁木齐 830047
^2.清华大学电机系电力系统及大型发电设备安全控制和仿真国家重点实验室北京 100084

AC Corrosion Behavior of Several Metallic Materials as Candidate for Boiler Electrode

ZHENG Zhong¹, ZHOU Yuanxiang¹^,²(

), LI Yongyin¹

^1.Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment, School of Electrical Engineering, Xinjiang University, Urumqi 830047, China
^2.State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment, Department of Electrical Engineering, Tsinghua University, Beijing 100084, China

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摘要:

通过控制电流密度模拟电极锅炉的工况，开展TA2钛合金、304不锈钢和20#钢 3种电极材料耐腐蚀实验和电化学实验，测量得到3种电极材料在不同浓度磷酸三钠溶液和不同电压下腐蚀前后电极腐蚀速率、极化电位和导电性等变化规律。结果表明，20#钢的腐蚀电流密度约为304不锈钢的4倍，钛电极的20倍。20#钢电极表面生成疏松的腐蚀产物，耐蚀性最差；钛电极的耐蚀性最好，但价格高；304不锈钢在500 A/m²的交流干扰下不能完整钝化，表面发生点蚀，但综合考虑耐腐蚀性、导电能力和经济性原则，在锅炉预期寿命较长的情况下，应选用不锈钢作为电极材料。

关键词 ：电极锅炉, 交流腐蚀, 高压电极, 磷酸三钠溶液, 产物膜

Abstract：

Corrosion resistance of electrode materials is an important factor affecting energy consumption and service life of electrode boiler. In this paper, the corrosion resistance of titanium, 304 stainless steel and 20# steel as candidate electrode materials was assessed by controlling the applied current density to simulate the working condition of electrode boiler. The corrosion rate, polarization potential and conductivity of the three electrode materials were measured before and after corrosion in different concentrations of trisodium phosphate solution by different applied voltages. The results show that the corrosion current density of 20# steel is about 4 and 20 times higher than that of 304 stainless steel and titanium respectively. Loose corrosion products are generated on the surface of 20# steel electrode, and thus its corrosion resistance is the worst. Results of comparative tests show that titanium electrode has the best corrosion resistance, but its price is high; 304 stainless steel cannot completely be passivated by 500 A/m² AC interference, thereby pitting corrosion occurs on its surface. By taking comprehensively the corrosion resistance, conductivity and economy into consideration, stainless steel may be the suitable candidate as electrode material in the case of long boiler life expectancy.

Key words： electrode boiler AC corrosion high voltage electrode trisodium phosphate solution passive film

收稿日期: 2021-12-16 32134.14.1005.4537.2021.357

ZTFLH:

TG174

作者简介: 郑重，男，1996年生，硕士生

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引用本文:

郑重, 周远翔, 李永印. 锅炉电极材料交流腐蚀特性与选型研究[J]. 中国腐蚀与防护学报, 2023, 43(1): 202-208.
Zhong ZHENG, Yuanxiang ZHOU, Yongyin LI. AC Corrosion Behavior of Several Metallic Materials as Candidate for Boiler Electrode. Journal of Chinese Society for Corrosion and protection, 2023, 43(1): 202-208.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2021.357 或 https://www.jcscp.org/CN/Y2023/V43/I1/202

图1 电极腐蚀系统

图2 电化学测试装置

图3 腐蚀后的电极

图4 除锈后的20#钢电极

图5 3种电极材料不同腐蚀时长电极的腐蚀速率

图6 100 ℃，0.003 mol/L磷酸三钠溶液下各电极电流值

图7 3种电极材料腐蚀360 h电极温度电流及拟合

图8 3种电极材料在不同电压、浓度下电极腐蚀速率

图9 3种电极材料在不同材料电极SEM图像

图10 3种电极材料在500 A/m2交流干扰下的电极电位

图11 3种电极材料在500 A/m2交流干扰下的极化曲线

表1 3种电极材料的极化曲线拟合数据

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