淡化海水后处理对金属管材腐蚀性的影响研究

发布时间：2019-02-22 10:58

【摘要】：采用硫酸溶解方解石的方法对反渗透淡化海水进行矿化,参照以色列颁布的淡化水后处理水质标准进行混合、加NaHCO_3调节水质,考察碱度、pH、碳酸钙沉淀势与NaHCO_3添加量的关系;采用挂片法和电化学法考察淡化海水的后处理对铸铁、不锈钢、双相钢腐蚀性的影响。结果表明,碱度、碳酸钙沉淀势和pH随NaHCO_3添加量的增大而升高。随着NaHCO_3添加量的增加,3种金属的腐蚀速率都呈下降趋势,其中双相钢的耐蚀性最好。在实验条件下处理后的淡化海水CaCO_3的质量浓度为99.3 mg/L,碱度(CaCO_3计)为82.9 mg/L、碳酸钙沉淀势(CaCO_3计)为6.6 mg/L(CaCO_3计),pH=7.76,水质稳定,具备一定的缓冲能力,可以进入市政供水系统。
[Abstract]:The method of sulfuric acid dissolving calcite was used to mineralize reverse osmosis desalination seawater. According to the water quality standard issued by Israel for desalination treatment, NaHCO_3 was added to adjust the water quality. The alkalinity and pH, were investigated. The relationship between the precipitation potential of calcium carbonate and the addition of NaHCO_3; The effect of desalination on corrosion of cast iron stainless steel and duplex steel was investigated by means of hanging plate method and electrochemical method. The results show that the alkalinity, precipitation potential and pH of calcium carbonate increase with the increase of NaHCO_3 content. With the increase of NaHCO_3 content, the corrosion rate of the three metals decreased, and the corrosion resistance of dual-phase steel was the best. Under the experimental conditions, the mass concentration of CaCO_3 in desalinated seawater was 99.3 mg/L, basicity (CaCO_3 meter), 82.9 mg/L, CaCO3 precipitation potential (CaCO_3 meter) was 6.6 mg/L (CaCO_3 meter), pH=7.76, The water quality is stable, has certain buffer ability, may enter the municipal water supply system.
【作者单位】：中国海洋大学海洋化学理论与工程技术教育部重点实验室;国家海洋局天津海水淡化与综合利用研究所;
【基金】：海洋公益性行业科研专项经费(201305039);海洋公益性行业科研专项经费(201405035);海洋公益性行业科研专项经费(201505021) 山东省“泰山学者”建设工程专项经费
【分类号】：P747

【相似文献】