Physico-chemical characteristics of corrosion scales in old iron pipes.

Corrosion scales play an important role in modifying water quality in drinking water distribution systems. The corrosion scales from old iron/steel pipes were analyzed for their structure and composition. Scales were studied both before and after drying. and goethite, magnetite and lepidocrocite were identified as the primary constituents of the dried samples. High concentrations of readily soluble ferrous phases were detected in wet-scale samples. The corrosion scales had a shell-like, enveloping layer, covering porous deposits of iron oxide phases. Our studies were able to identify important differences between corrosion scales found in two different water distribution systems. Further studies are needed to establish the role of corrosion scales in the mechanism of iron release from corroded pipes.

[1]  William H. Walker,et al.  THE CORROSION OF IRON AND STEEL. , 1912, Science.

[2]  T. E. Larson,et al.  Laboratory Studies Relating Mineral Quality of Water to Corrosion of Steel and Cast Iron , 1958 .

[3]  Thurston Eric Larson,et al.  Corrosion and Tuberculation of Cast Iron , 1957 .

[4]  Vernon L. Snoeyink,et al.  The siderite model of the formation of corrosion-resistant scales , 1981 .

[5]  M. Abdelmoula,et al.  Mechanisms of formation and structure of green rust one in aqueous corrosion of iron in the presence of chloride ions , 1998 .

[6]  Rolf Eliassen,et al.  Effects of pH and Velocity on Corrosion of Steel Water Pipes , 1956 .

[7]  J. E. Singley,et al.  Influence of Buffer Capacity, Chlorine Residual, and Flow Rate on Corrosion of Mild Steel and Copper , 1987 .

[8]  Werner Stumm,et al.  Determination of Ferrous Iron in the Presence of Ferric Iron With Bathophenanthroline , 1960 .

[9]  A. Kuch,et al.  INVESTIGATIONS OF THE REDUCTION AND RE-OXIDATION KINETICS OF IRON (III) OXIDE SCALES FORMED IN WATERS , 1988 .

[10]  R. H. Loeppert,et al.  Arsenite and Arsenate Adsorption on Ferrihydrite: Kinetics, Equilibrium, and Adsorption Envelopes , 1998 .

[11]  Thurston Eric Larson,et al.  Corrosion by Water at Low Flow Velocity , 1954 .

[12]  Olli H. Tuovinen,et al.  Bacterial, chemical, and mineralogical characteristics of tubercles in distribution pipelines , 1980 .

[13]  Ramon G. Lee,et al.  Examining the Relationship Between Iron Corrosion and the Disinfection of Biofilm Bacteria , 1993 .

[14]  J. Génin,et al.  Hyperfine interactions and structures of ferrous hydroxide and green rust II in sulfated aqueous media , 1988 .

[15]  M. Abdelmoula,et al.  Identification of Green Rust Compounds in the Aqueous Corrosion Processes of Steels; the Case of Microbially Induced Corrosion and Use of 78 K CEMS , 1998 .

[16]  Bernard Humbert,et al.  Thermodynamic Equilibria in Aqueous Suspensions of Synthetic and Natural Fe(II)−Fe(III) Green Rusts: Occurrences of the Mineral in Hydromorphic Soils , 1998 .

[17]  R. J. Hill,et al.  Quantitative phase analysis from neutron powder diffraction data using the Rietveld method , 1987 .

[18]  Thurston E. Larson,et al.  Loss in Water Main Carrying Capacity , 1967 .

[19]  H. Rietveld.  A profile refinement method for nuclear and magnetic structures , 1969 .

[20]  P. Refait,et al.  The anionic species competition in iron aqueous corrosion: Role of various green rust compounds , 1997 .

[21]  Werner Stumm,et al.  THE SOLUBILITY OF FERROUS IRON IN CARBONATE‐BEARING WATERS , 1970 .

[22]  John R. Baylis,et al.  Prevention of Corrosion and “Red Water” , 1926 .