碳化及氯盐侵蚀条件下锌牺牲阳极对钢筋保护行为研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (1): 113-120.

碳化及氯盐侵蚀条件下锌牺牲阳极对钢筋保护行为研究

陈立保¹, 刘光严², 金林森¹, 穆松², 王涛², 汤金辉³

1.中铁第四勘察设计院集团有限公司,水下隧道技术国家地方联合工程研究中心,武汉 430063;
2.江苏省建筑科学研究院有限公司,高性能土木工程材料国家重点实验室,南京 210008;
3.东南大学材料科学与工程学院,南京 211189

收稿日期:2023-08-24 修订日期:2023-10-25 出版日期:2024-01-15 发布日期:2024-01-16
通信作者: 刘光严,工程师。E-mail:liugy813@163.com
作者简介:陈立保(1979—),男,正高级工程师。主要从事隧道与地下工程设计及研究工作。E-mail:58500464@qq.com
基金资助:
国家自然科学基金(U1934206);钻爆法海底隧道喷锚支护耐久性技术研究(2021K036-W01)

Protective Behavior of Zinc Sacrificial Anode on Steel Bars under Carbonization and Chloride Salt Erosion

CHEN Libao¹, LIU Guangyan², JIN Linsen¹, MU Song², WANG Tao², TANG Jinhui³

1. National-Local Joint Engineering Research Center of Underwater Tunnelling Technology, China Railway Siyuan Subway and Design Group Co., Ltd., Wuhan 430063, China;
2. State Key Laboratory of High Performance Civil Engineering Materials, Jiangsu Research Institute of Building Science Co., Ltd., Nanjing 210008, China;
3. School of Materials Science and Engineering, Southeast University, Nanjing 211189, China

Received:2023-08-24 Revised:2023-10-25 Online:2024-01-15 Published:2024-01-16

摘要/Abstract

摘要： 采用水泥基材料包覆的金属锌作为牺牲阳极,通过混凝土模拟孔溶液模拟碳化及氯离子侵蚀环境,研究牺牲阳极材料对钢筋的保护作用。电化学测试结果表明,当Q235钢片和纯锌片形成电偶对时,Q235钢在质量分数为1.5%的氯化钠溶液中易发生锈蚀,而在溶液中添加适量的碱(LiOH)以及卤素碱金属化合物(LiBr)能够激发金属锌持续溶解,持续提供牺牲阳极保护,有效抑制钢片的腐蚀。结合XRD测试结果可知:LiOH可以维持锌的溶解,并且与锌片反应生成锌的氢氧化物;卤素碱金属化合物可以诱发金属锌的腐蚀。相比于卤素碱金属化合物,加入高浓度LiOH对钢筋的阻锈效果更好。本研究有助于完善牺牲阳极材料的激发技术,提升牺牲阳极技术对钢筋的保护作用。

关键词: 牺牲阳极, 金属锌, 激发剂, 腐蚀电流密度, 电化学阻抗谱

Abstract: In this paper, with the metal zinc coated with cement-based materials as a sacrificial anode, the protective effect of sacrificial anode on steel bars was studied in concrete simulated pore solution to simulate carbonization and chloride ion erosion environments. The electrochemical test results show that when Q235 steel and pure zinc sheet form a galvanic pair, Q235 steel is prone to corrosion in a 1.5% (mass fraction) sodium chloride solution. However, adding an appropriate amount of alkali (LiOH) and halogen alkali metal compounds (LiBr) to simulated pore solution can stimulate the continuous dissolution of metallic zinc, continue to provide sacrificial anode protection and effectively inhibite the corrosion of steel sheets. Combined with XRD test results, it can be judged that LiOH can maintain zinc dissolution and generate zinc hydroxide, and the presence of halogen can induce corrosion of metallic zinc. Compared to halogen alkali metal compounds, adding high concentration of LiOH has a better rust resistance effect on steel bars. This study contributes to improve the excitation technology of sacrificial anode materials and enhance the protective effect of sacrificial anode technology on steel bars.

Key words: sacrificial anode, zinc metal, activator, corrosion current density, electrochemical impedance spectroscopy

中图分类号:

TU528

陈立保, 刘光严, 金林森, 穆松, 王涛, 汤金辉. 碳化及氯盐侵蚀条件下锌牺牲阳极对钢筋保护行为研究[J]. 硅酸盐通报, 2024, 43(1): 113-120.

CHEN Libao, LIU Guangyan, JIN Linsen, MU Song, WANG Tao, TANG Jinhui. Protective Behavior of Zinc Sacrificial Anode on Steel Bars under Carbonization and Chloride Salt Erosion[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(1): 113-120.

参考文献

[1] 黄锦圳. 疏水功能型有机阻锈剂的阻锈作用和机理[D]. 广州: 华南理工大学, 2021.
HUANG J Z. Anti-rust effect and mechanism of hydrophobic functional organic rust inhibitor[D]. Guangzhou: South China University of Technology, 2021 (in Chinese).
[2] CHESS P. Corrosion in reinforced concrete structures[M]//Cathodic Protection of Steel in Concrete and Masonry, Second Edition. Leiton: CRC Press, 2013: 1-16.
[3] MAHASIRIPAN A, TANGTERMSIRIKUL S, SANCHAROEN P. A study of different sacrificial anode materials to protect corrosion of reinforcing steel in concrete[J]. Thammasat International Journal of Science and Technology, 2014, 19: 16-25.
[4] THOMAS S, BIRBILIS N, VENKATRAMAN M S, et al. Corrosion of zinc as a function of pH[J]. CORROSION, 2012, 68(1): 1-9.
[5] 孔纲, 陈九龙, 卢锦堂. 饱和Ca(OH)₂溶液pH值对热镀锌钢表面锌酸钙覆盖层的影响[J]. 材料工程, 2010, 38(9): 74-79.
KONG G, CHEN J L, LU J T. Effects of pH value of saturated Ca(OH)₂ solution on CaHZn coating of hot dip galvanized steel[J]. Journal of Materials Engineering, 2010, 38(9): 74-79 (in Chinese).
[6] TROCONIS DE RINCÓN O, TORRES-ACOSTA A, SAGÜÉS A, et al. Galvanic anodes for reinforced concrete structures: a review[J]. Corrosion, 2018, 74(6): 715-723.
[7] KHOMWAN N, MUNGSANTISUK P. Startup Thailand: a new innovative sacrificial anode for reinforced concrete structures[J]. Engineering Journal, 2019, 23(4): 235-261.
[8] BULLARD S J, CRAMER S, COVINO B. Effectiveness of cathodic protection: final report, June 30, 2009[R]. National Energy Technology Laboratory, 2009.
[9] ZHANG X G. Corrosion and electrochemistry of zinc[M]. New York: Plenum Press, 1996.
[10] WANG F, XU J X, XU Y, et al. A comparative investigation on cathodic protections of three sacrificial anodes on chloride-contaminated reinforced concrete[J]. Construction and Building Materials, 2020, 246: 118476.
[11] GARNICA-RODRíGUEZ A, MONTOYA R, RODRíGUEZ-GOMEZ F J, et al. Effect of a fast potential change on the early stage of zinc passivation in a saturated calcium hydroxide solution[J]. Frontiers in Materials, 2022, 9: 877728.
[12] Standard test method for determining effects of chemical admixtures on corrosion of embedded steel reinforcement in concrete exposed to chloride environments: ASTM G109[S]. Pennsylvania: American Society of Testing Materials, 2023.
[13] STERN M. Closure to “Discussion of ‘Electrochemical Polarization, 1. A Theoretical Analysis of the Shape of Polarization Curves’ [M. Stern and A. L. Geary (pp. 56-63, Vol. 104)]”[J]. Journal of the Electrochemical Society, 1957, 104(12): 751.
[14] SCULLY J. The polarization resistance method for determination of instantaneous corrosion rates[M]//Electrochemical Techniques in Corrosion Science and Engineering. Leiton: CRC Press, 2002.
[15] CHEN W, DU R G, YE C Q, et al. Study on the corrosion behavior of reinforcing steel in simulated concrete pore solutions using in situ raman spectroscopy assisted by electrochemical techniques[J]. Electrochimica Acta, 2010, 55(20): 5677-5682.
[16] KOLEVA D A. Corrosion and protection in reinforced concrete: pulse cathodic protection: an improved cost-effective alternative[D]. Delft: TU Delft, 2007.
[17] YU Y Z, WANG Y Z, LI J, et al. In situ click-assembling monolayers on copper surface with enhanced corrosion resistance[J]. Corrosion Science, 2016, 113: 133-144.
[18] FAWCETT T G, KABEKKODU S N, BLANTON J R, et al. Chemical analysis by diffraction: the powder diffraction file^TM[J]. Powder Diffraction, 2017, 32(2): 63-71.
[19] MACíAS A, ANDRADE C. Corrosion rate of galvanized steel immersed in saturated solutions of Ca(OH)₂ in the pH range 12-13.8[J]. British Corrosion Journal, 1983, 18(2): 82-87.
[20] MACíAS A, ANDRADE C. Corrosion of galvanized steel in dilute Ca(OH)₂ solutions (pH 11.1-12.6)[J]. British Corrosion Journal, 1987, 22(3): 162-171.
[21] FARINA S B, DUFFÓ G S. Corrosion of zinc in simulated carbonated concrete pore solutions[J]. Electrochimica Acta, 2007, 52(16): 5131-5139.