期刊
WATER RESEARCH
卷 88, 期 -, 页码 816-825出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.watres.2015.11.021
关键词
Reclaimed water; Stainless steel; Localized corrosion; Corrosion scale; Podiform chromite deposit; Water quality parameters
资金
- National High-tech Research Plan of China [2013AA065205]
- Program for Changjiang Scholars and Innovative Research Team in University [IRT1261]
- Beijing Science and Technology Program [Z141100006014048]
To reveal corrosion behavior of stainless steel delivery pipe used in reclaimed water treatment, this research focused on the morphological, mineralogical and chemical characteristics of stainless steel corrosion scale and corroded passive film. Corrosion scale and coupon samples were taken from a type 304 pipe delivering reclaimed water to a clear well in service for more than 12 years. Stainless steel corrosion scales and four representative pipe coupons were investigated using mineralogy and material science research methods. The results showed corrosion scale was predominantly composed of goethite, lepidocrocite, hematite, magnetite, ferrous oxide, siderite, chrome green and chromite, the same as that of corroded pipe coupons. Hence, corrosion scale can be identified as podiform chromite deposit. The loss of chromium in passive film is a critical phenomenon when stainless steel passive film is damaged by localized corrosion. This may provide key insights toward improving a better comprehension of the formation of stainless steel corrosion scale and the process of localized corrosion. The localized corrosion behavior of stainless steel is directly connected with reclaimed water quality parameters such as residual chlorine, DO, Cl- and SO42-. In particular, when a certain amount of residual chlorine in reclaimed water is present as an oxidant, ferric iron is the main chemical state of iron minerals. (C) 2015 Elsevier Ltd. All rights reserved.
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