氯化物与硫酸盐浓度比对黄铜-铅电偶腐蚀的影响

    Effect of Chloride-to-sulfate Mass Ratio on Galvanic Corrosion of Brass-Lead Joints

      摘要
    • 摘要: 以供水管道中黄铜与铅焊接的电偶连接为研究对象，探究不同氯化物与硫酸盐浓度比（CSMR）对黄铜-铅电偶腐蚀的影响。分析了黄铜-铅电偶腐蚀的金属释放量、电化学行为及腐蚀产物。结果表明，CSMR使得多电偶对中阳极极性改变。在CSMR=0～0.5时，铅锌同作为阳极；CSMR=1时锌单独作为阳极；而CSMR=∞时，铅单独作为阳极。铅的腐蚀产物为棒状的PbCO3及片状的Pb3（CO3）2（OH）2，锌的产物为板状的ZnO2，而铜和锡的产物分别为颗粒状Cu2O和块状SnO2。当供水管道中黄铜与含铅材料电偶连接时，为减少铅的释放，建议将CSMR控制在1左右。

       

      Abstract: Taking the galvanic coupling connection of brass and lead soldering in water distribution system as the object, the effect of different chloride to sulfate mass ratio (CSMR) on the brass-lead galvanic corrosion was investigated.The metal release, electrochemical behavior and corrosion products of the brass-lead galvanic corrosion were analyzed.The results show that CSMR makes the anodic polarity change in the multi-electrode pairs.At CSMR of 0-0.5, lead and zinc are acted as anode simultaneously; at CSMR=1, zinc is acted as anode alone; and at CSMR=∞, lead is acted as anode alone. The corrosion products of lead are PbCO3 in the form of rods and Pb3(CO3) 2(OH) 2 in the form of flakes.The product of zinc is flat ZnO2, the product of copper is granular Cu2O, and the product of tin is lumpy SnO2.When brass is galvanic connected to lead-containing material in the water supply pipeline, it is recommended to control the CSMR around 1 to reduce the release of lead.

       

      • HTML全文
      • 参考文献(29)
      • 相关文章
      • 施引文献
    • 资源附件(0)

    /

    返回文章
    返回
    邮件订阅 RSS