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| 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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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, SO42-- 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＞SO42-＞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.
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Received: 27 August 2019
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| Fund: National Natural Science Foundation of China(51478307) |
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Corresponding Authors:
TIAN Yimei
E-mail: ymtian_2000@126.com
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