再生水水质因素对铸铁管道的腐蚀研究

doi:10.11902/1005.4537.2019.133

中国腐蚀与防护学报

2020, Vol. 40

Issue (6): 569-576 DOI: 10.11902/1005.4537.2019.133

研究报告

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再生水水质因素对铸铁管道的腐蚀研究

贾世超¹, 高佳祺¹, 郭浩¹, 王超², 陈杨杨², 李旗², 田一梅¹(

)

1.天津大学环境科学与工程学院天津 300350
2.天津生态城水务投资建设有限公司天津 300467

Influence of Water Quality on Corrosion of Cast Iron Pipe in Reclaimed Water

JIA Shichao¹, GAO Jiaqi¹, GUO Hao¹, WANG Chao², CHEN Yangyang², LI Qi², TIAN Yimei¹(

)

1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
2. Tianjin Eco-City Water Investment & Construction Co. , Ltd, Tianjin 300467, China

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摘要:

基于再生水管道 (无内衬球墨铸铁管) 腐蚀模拟实验装置，选取pH、总硬度、SO₄^2-和Cl^-等开展多水质因素腐蚀实验，采用电化学测试方法和挂片失重法，研究了再生水管道的瞬时腐蚀速率、平均腐蚀速率与腐蚀垢层阻抗特性的变化规律。结果表明，电化学测试所得瞬时腐蚀速率、挂片失重法所得平均腐蚀速率与腐蚀垢层阻抗变化规律具有一致性。正交试验结果表明，水质因素对球墨铸铁管腐蚀影响程度排序为：pH＞总硬度＞SO₄^2-＞Cl^-；偏酸性、低硬度的水体更易造成管道腐蚀，且水体低pH对管道腐蚀最为明显；偏碱性的水体在减少管壁腐蚀的同时，促进管道形成管垢保护管壁；阴离子浓度越高，垢层扩散阻抗值越小，垢层越不稳定。

关键词 ：再生水, 管道腐蚀, 瞬时腐蚀速率, 平均腐蚀速率, 腐蚀垢层阻抗

Abstract：

In view of the complexity of the corrosion for reclaimed water pipe, the corrosion behavior of coupons of reclaimed water pipe (ductile iron pipe without lining) in collected reclaimed waters with varying pH, total hardness, SO₄^2-- and Cl^--content was characterized by means of weight loss measurement, potentiodynamic polarization measurement and electrochemical impedance spectroscopy. The results indicated that: the instantaneous corrosion rate obtained by electrochemical test and the average corrosion rate obtained by weight loss method of the coupons are consistent with the variation of corrosion scale resistance. The orthogonal experimental results show that the effect degree of water parameters on corrosivity of reclaim waters may be ranked corresponding to the following order: pH＞total hardness＞SO₄^2-＞Cl^-. The slightly acidic water with low hardness was apt to cause corrosion of the pipeline coupon, and the water of low pH value presented the most obvious effect on the corrosion of the pipeline coupon. The alkalescent water could promote the formation of scales on the pipeline coupons so that to act as a protective scale for the substrate. However, the higher the anion concentration of waters, the smaller the diffusion impedance of the scale, and the more unstable the scale.

Key words： reclaimed water corrosion of pipeline instantaneous corrosion rate average corrosion rate corrosion layer impedance

收稿日期: 2019-08-27

ZTFLH:

TG172.5

基金资助:国家自然科学基金(51478307)

通讯作者: 田一梅 E-mail: ymtian_2000@126.com

Corresponding author: TIAN Yimei E-mail: ymtian_2000@126.com

作者简介: 贾世超，女，1991年生，博士生

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引用本文:

贾世超, 高佳祺, 郭浩, 王超, 陈杨杨, 李旗, 田一梅. 再生水水质因素对铸铁管道的腐蚀研究[J]. 中国腐蚀与防护学报, 2020, 40(6): 569-576.
Shichao JIA, Jiaqi GAO, Hao GUO, Chao WANG, Yangyang CHEN, Qi LI, Yimei TIAN. Influence of Water Quality on Corrosion of Cast Iron Pipe in Reclaimed Water. Journal of Chinese Society for Corrosion and protection, 2020, 40(6): 569-576.

链接本文:

https://www.jcscp.org/CN/10.11902/1005.4537.2019.133 或 https://www.jcscp.org/CN/Y2020/V40/I6/569

表1 再生水厂出水水质指标

表2 正交试验方案表

表3 水质检测项及方法

图1 电解池构造图

图2 动态循环再生水中金属腐蚀实验装置

图3 瞬时腐蚀速率随时间的变化

表4 瞬时腐蚀速率极差分析表

图4 正交试验阻抗分析Nyquist图

图5 正交试验阻抗分析Bode图

图6 等效电路

表5 等效电路拟合结果

图7 正交试验阻抗值变化

表6 Warburg阻抗影响因素的极差分析计算

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