锅炉电极材料交流腐蚀特性与选型研究  

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

作　　者：郑重 周远翔 李永印[1] ZHENG Zhong;ZHOU Yuanxiang;LI Yongyin(Wind Solar Storage Division of State Key Laboratory of Power System and Generation Equipment,School of Electrical Engineering,Xinjiang University,Urumqi 830047,China;State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)

机构地区：[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

出　　处：《中国腐蚀与防护学报》2023年第1期202-208,共7页Journal of Chinese Society For Corrosion and Protection

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。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 by500 A/m2AC 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.

关 键 词：电极锅炉 交流腐蚀 高压电极 磷酸三钠溶液 产物膜 

分 类 号：TG174[金属学及工艺—金属表面处理]