Abstract
Abstract Dynamic templating as a result of cathodic hydrogen gas production is suggested as a possible mechanism for the formation of tube-like corrosion products on an unlined cast iron pipe in a drinking water distribution system. Mounds of corrosion product, with protruding tubes and freestanding tubes, were observed within a single 30 cm section of piping. Internal morphologies for all shapes were texturally complex although mineralogically simple, composed of two iron oxide/oxyhydroxides minerals: α-FeOOH (goethite) and Fe3O4 (magnetite). Static templating by either microorganisms or minerals was rejected as a possible mechanism for tube formation in this study.
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