化学清洗时过热器氧化皮剥落部位基材腐蚀试验研究

doi:10.11930/j.issn.1004-9649.201702022

中国电力 ›› 2018, Vol. 51 ›› Issue (5): 123-127,146.DOI: 10.11930/j.issn.1004-9649.201702022

化学清洗时过热器氧化皮剥落部位基材腐蚀试验研究

邓宇强, 叶智, 祁东东, 张少勇, 张小平, 蔡国保, 王思卜, 张童童

华电电力科学研究院有限公司, 浙江杭州 310030

收稿日期:2017-02-06 修回日期:2017-12-25 出版日期:2018-05-05 发布日期:2018-05-07
作者简介:邓宇强(1974-),男,四川雅安人,硕士,高级工程师,从事电厂化学及电站设备腐蚀与防护研究,E-mail:dengyuqiang-163@163.com

Study on Localized Corrosion Between Oxides Dissolution and Substrate Material in the Process of Chemical Cleaning for Superheaters

DENG Yuqiang, YE Zhi, QI Dongdong, ZHANG Shaoyong, ZHANG Xiaoping, CAI Guobao, WANG Sipu, ZHANG Tongtong

Huadian Electric Power Research Institute Co., Ltd., Hangzhou 310030, China

Received:2017-02-06 Revised:2017-12-25 Online:2018-05-05 Published:2018-05-07

摘要/Abstract

摘要： 锅炉过热器氧化皮发生局部剥落的部位，在进行化学清洗时会发生局部电化学快速腐蚀的情况。工程清洗后的割管和试验室的验证性模拟清洗试验，均发现了局部氧化皮剥落部位出现了深度在400 μm以上的腐蚀坑，且这种腐蚀主要在铁素钢如T22、12Cr1MoV、T91中发生。通过电化学腐蚀试验装置，开展了对这种腐蚀的监测评价和腐蚀控制工艺研究。选取T22、12Cr1MoV、T91等3种过热器管样，进行氧化皮清洗溶解试验，测量氧化皮清洗过程中完整氧化皮管样电极和裸露金属电极之间腐蚀电流密度，并通过对比试验考察清洗液加入还原剂后的腐蚀电流密度变化情况。研究结果表明，试验所用材料氧化皮脱落部位化学清洗时的局部腐蚀速率是标准规定值的数十倍，可通过及时补加还原剂抗坏血酸的方法加以控制。

关键词: 火电机组, 过热器, 氧化皮, 剥落, 化学清洗, 局部腐蚀, 还原剂

Abstract: Localized electrochemical corrosion may take place at region of oxide exfoliation or cracking in the process of chemical cleaning for superheaters. After the chemical cleaning process, the corrosive pits over 400 μm deep are detected on both cut superheater samples and simulated testing tubes, especially in iron steel such as T22, 12Cr1MoV and T91. The monitoring evaluation and corrosion control technology are carried out through the electrochemical corrosion test device.Three kinds of superheater tube samples are selected, such as T22, 12Cr1MoV and T91, and the corrosion current density between the intact oxidation tube electrode and the bare metal electrode during the oxidation skin cleaning process is measured. The change of corrosion current density after the addition of reductant is investigated by contrast test. It is shown that the local corrosion rate during chemical cleaning of the exfoliated parts of the materials used in the experiment is tens times of the standard values, which can be controlled by adding ascorbic acid in time.

Key words: power plant, superheater, oxide, exfoliation, chemical cleaning, localized corrosion, reducing agent

中图分类号:

邓宇强, 叶智, 祁东东, 张少勇, 张小平, 蔡国保, 王思卜, 张童童. 化学清洗时过热器氧化皮剥落部位基材腐蚀试验研究[J]. 中国电力, 2018, 51(5): 123-127,146.

DENG Yuqiang, YE Zhi, QI Dongdong, ZHANG Shaoyong, ZHANG Xiaoping, CAI Guobao, WANG Sipu, ZHANG Tongtong. Study on Localized Corrosion Between Oxides Dissolution and Substrate Material in the Process of Chemical Cleaning for Superheaters[J]. Electric Power, 2018, 51(5): 123-127,146.

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https://www.electricpower.com.cn/CN/Y2018/V51/I5/123

参考文献

[1] FRY A, OSGERBY S, WRIGHT M. Oxidation of alloys in steam environments:a review[J]. Computer Methods in Applied Mechanics & Engineering, 2002, 85(4):374-375.
[2] 邓宇强, 曹杰玉, 张祥金, 等. 火电厂过热器化学清洗配方及工艺的研究[J]. 中国电力, 2013, 46(3):78-81.DENG Yuqiang, CAO Jieyu, ZHANG Xiangjin, et al. Study on superheater chemical cleaning with different agents[J]. Electric Power, 2013, 46(3):78-81.
[3] 陈超, 庄文军, 张祥金, 等. 过热器管道化学清洗试验研究[J]. 热力发电, 2013, 42(1):67-72.CHEN Chao, ZHUANG Wenjun1, ZHANG Xiangjin, et al. Experimental study on chemical cleaning of superheater tubes[J]. Thermal Power Generation, 2013, 42(1):67-72.
[4] CHRISTOV M, POPOVA A. Adsorption characteristics of corrosion inhibitors from corrosion rate measurements[J]. Corrosion Science, 2004, 46(7):1613-1620.
[5] SATO N. The stability of localized corrosion[J]. Corrosion Science, 1995, 37(12):1947-1967.
[6] CHENG Y F, BULLERWELL J, STEWARD F R.Electrochemical investigation of the corrosion behavior of chromium-modified carbon steels in water[J]. Electrochimica Acta, 2003, 48(1):1521-1530.
[7] YAMASHITA M, NAGANO H, ORIANI R A. Dependence of corrosion potential and corrosion rate of a low-alloy steel upon depth of aqueous solution[J]. Corrosion Science, 1998, 40(9):1447-1453.
[8] 林卫丽, 邓宇强, 张祥金, 等. 过热器化学清洗中金属材料的腐蚀[J]. 腐蚀与防护, 2014.35(1):74-77.LIN Weili, DENG Yuqiang, ZHANG Xiangjin, et al. Metal materials corrosion during superheater chemical cleaning[J]. Corrosion & Protection, 2014.35(1):75-77.
[9] 国家能源局. 火力发电厂锅炉化学清洗导则:DL/T 794-2012[S]. 北京:中国电力出版社. 2012.
[10] LEE S O, TRAN T, JUNG B H, et al. Dissolution of iron oxide using oxalic acid[J]. Hydrometallurgy, 2007, 87(3):91-99.
[11] MANJANNA J, G.VENKATESWARAN G, B.SHERIGARA B S, et al. Dissolution studies of chromium substituted iron oxides in reductive-complexing agent mixtures[J]. Hydrometallurgy, 2001, 60(2):155-162.
[12] MANJANNA J, VENKATESWARAN G, SHERIGARA B S, et al. Reductive Dissolution of chromium substituted hematites in V(Ⅱ)-EDTA formulation[J]. Power plant Chemistry, 2001, 3(2):80-86.
[13] A M Al-Mayouf. Dissolution of magnetite coupled galvanically with iron in environmentally friendly chelant solutions[J]. Corrosion Science, 2006, 48(4):898-912.
[14] 庄文军, 龙国军, 甘超齐, 等. 过热器氧化皮催化柠檬酸清洗研究及应用[J]. 中国电力, 2015, 48(3):13-16.ZHUANG Wenjun, LONG Guojun, GAN Chaoqi, et al. Study and application of catalytic citric acid cleaning of superheater tubes[J]. Electric Power, 2015, 48(3):13-16.

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化学清洗时过热器氧化皮剥落部位基材腐蚀试验研究

Study on Localized Corrosion Between Oxides Dissolution and Substrate Material in the Process of Chemical Cleaning for Superheaters

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化学清洗时过热器氧化皮剥落部位基材腐蚀试验研究

Study on Localized Corrosion Between Oxides Dissolution and Substrate Material in the Process of Chemical Cleaning for Superheaters

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