再生水氯消毒对管网腐蚀的影响
首发时间:2016-09-28
摘要:为了弄清加氯消毒后的再生水对管材的腐蚀程度,对加氯后的再生水腐蚀水泥砂浆内衬和铸铁管材的情况开展试验研究,分析硅酸盐和钙离子在试验管段中的释放浓度,结果发现再生水加氯在短时间内对水泥砂浆内衬腐蚀的影响不大。采用电镜扫描、电化学法和失重法等研究再生水对铸铁材料的腐蚀情况,从多重角度分析加氯对腐蚀速率的影响。结果表明,提高加氯量能够间接减缓再生水对铸铁材料的腐蚀速率;经过再生水加氯腐蚀后的金属表面形成了含氯的腐蚀产物。
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Effect of reclaimed water chlorination on corrosion of pipelines
Abstract:The corrosion of reclaimed water to pipe materials is evident. However, whether the reclaimed water chlorination would accelerate the corrosion process is unknown. According to the situation, the corrosion of reclaimed water to cement mortar linings (CML) and cast iron materials after chlorination was studied in detail. The concentrations of silicates and calcium ions released in pipes were analyzed to study the corrosion of CML. Results showed that CML corrosion was not directly influenced by chlorination in the initial period. Moreover, the scanning electron microscope (SEM), electrochemical methods, and the weight-loss method were used to investigate the influence of chlorination on the corrosion rate of cast iron materials. It was proved that increased chlorine dosage could indirectly retard corrosion. Besides, corrosion products with Cl were produced on the cast iron surface after the corrosion process.
Keywords: municipal engineering corrosion chlorine disinfection cement mortar linings cast iron pipe
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No.4705479222691474****
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