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高矿化度矿井水中螺纹钢锚杆点蚀机制研究

褚晓威 鞠文君 付玉凯

褚晓威, 鞠文君, 付玉凯. 高矿化度矿井水中螺纹钢锚杆点蚀机制研究[J]. 矿业科学学报, 2021, 6(3): 305-313. doi: 10.19606/j.cnki.jmst.2021.03.007
引用本文: 褚晓威, 鞠文君, 付玉凯. 高矿化度矿井水中螺纹钢锚杆点蚀机制研究[J]. 矿业科学学报, 2021, 6(3): 305-313. doi: 10.19606/j.cnki.jmst.2021.03.007
Chu Xiaowei, Ju Wenjun, Fu Yukai. Study on pitting mechanism of rebar rockbolt in highly-mineralized mine water[J]. Journal of Mining Science and Technology, 2021, 6(3): 305-313. doi: 10.19606/j.cnki.jmst.2021.03.007
Citation: Chu Xiaowei, Ju Wenjun, Fu Yukai. Study on pitting mechanism of rebar rockbolt in highly-mineralized mine water[J]. Journal of Mining Science and Technology, 2021, 6(3): 305-313. doi: 10.19606/j.cnki.jmst.2021.03.007

高矿化度矿井水中螺纹钢锚杆点蚀机制研究

doi: 10.19606/j.cnki.jmst.2021.03.007
基金项目: 

国家自然科学基金 52004126

国家自然科学基金 51804159

天地科技开采设计事业部科技创新基金 KJ-2018-TDKCZL-13

详细信息
    作者简介:

    褚晓威(1986—),男,山东枣庄人,副研究员,博士研究生,主要从事煤矿巷道矿压理论与支护技术等方面的研究工作。Tel: 010-84263126-8004,E-mail: chuxiaowei2003@163.com

  • 中图分类号: TD353;TG172

Study on pitting mechanism of rebar rockbolt in highly-mineralized mine water

  • 摘要: 受地下水侵蚀及开采环境影响,锚杆易发生腐蚀甚至断裂,点蚀等局部腐蚀形式通常是锚杆失效的主要源头。为研究螺纹钢锚杆在腐蚀性矿井水中的点蚀行为,采用金相、电化学及显微视频等手段,观测了4种锚杆点蚀发展过程并初步揭示其形成机制。结果表明,锚杆的点蚀易发生在夹杂物处,夹杂物及界面处基体优先溶解形成界面沟槽并出现局部酸化,从而进一步加速基体和夹杂物的溶解、脱落而形成点蚀坑;采用大小电极极化试验对比验证了界面沟槽对腐蚀的加速作用。
  • 图  1  试样加工方法及尺寸

    Figure  1.  Processing method and size of rockbolts samples

    图  2  两种材料显微组织照片

    Figure  2.  Microstructures of the 2 materials observed by OM

    图  3  氧化物夹杂形态及元素分布

    Figure  3.  Oxide inclusion morphology and elements mapping

    图  4  小电极封装示意图

    Figure  4.  The schematic of small electrode

    图  5  小电极测试及观测系统示意图

    Figure  5.  The schematic of test and observation apparatus for small electrode

    图  6  热处理600锚杆腐蚀后表面形貌

    Figure  6.  The surface morphology of HT600 after corrosion

    图  7  热轧500锚杆腐蚀过程样品表面形貌

    Figure  7.  The evolution of surface morphology of HR500 during the corrosion

    图  8  动电位极化后锚杆腐蚀形貌

    Figure  8.  The surface morphology of rockbolts after macro-scale polarization

    图  9  热轧335腐蚀前后夹杂物形貌

    Figure  9.  The inclusion morphology of HR335 before and after corrosion

    图  10  锚杆腐蚀演化及点蚀形成过程示意图

    Figure  10.  Schematic diagram of rockbolt corrosion evolution and pitting process

    图  11  小电极样品与大电极样品在模拟溶液中的极化曲线

    Figure  11.  Macro-scale and micro-scale polarization curves of different materials in simulating solution

    图  12  部分典型锚杆加工损伤

    Figure  12.  Part of typical machining damage of rockbolt

    表  1  锚杆钢材化学成分

    Table  1.   Chemical composition of rockbolts

    试样元素含量/%
    CSiMnPSCrNiMoCuV
    HR3350.280.310.780.0260.0260.0230.0170.0040.0190.003
    HR5000.230.371.490.0230.0280.0410.0240.0070.0280.068
    HT6000.210.461.520.0150.0070.0220.0100.0070.0130.050
    HT7000.230.481.530.0100.0060.0250.0090.0070.0140.047
    下载: 导出CSV

    表  2  非金属夹杂物检验结果

    Table  2.   Results of nonmetallic inclusion test

    锚杆非金属夹杂物/级DS
    ABCD
    HR3351000000.500
    HT6001000000.500
    注:A为硫化物类;B为氧化铝类;C为硅酸盐类;D为球状氧化物;DS为单颗粒球状类。
    下载: 导出CSV

    表  3  腐蚀性矿井水离子浓度

    Table  3.   Ion concentration of corrosive mine water

    离子类型离子浓度/(mg·L-1)
    双柳煤矿红庆河煤矿
    K+1.422.60
    Na+385288
    Ca2+3.969.43
    Mg2+1.203.43
    Cl-302321
    SO42-14.24203
    HCO3-558428
    CO32-024.06
    总矿化度1 2661 280
    下载: 导出CSV

    表  4  模拟溶液配比

    Table  4.   The proportion of simulated solution

    溶质NaClNaHCO3Na2SO4
    浓度/(mg·L-1)530589601
    下载: 导出CSV

    表  5  大小电极自腐蚀电流密度对比

    Table  5.   Comparison of self-corrosion current densities between small and large electrode

    材料大电极自腐蚀
    电流密度/(A·cm-2)
    小电极自腐蚀
    电流密度/(A·cm-2)
    HR3358.9×10-61.26×10-5
    HR5006.61×10-61.2×10-5
    HT6006.42×10-61.5×10-5
    HT7009.8×10-61.17×10-5
    下载: 导出CSV
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  • 收稿日期:  2020-11-07
  • 修回日期:  2021-01-15
  • 刊出日期:  2021-06-01

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