Astrakhan-Mangyshlak Water Main: Corrosion State of the Inner Surface, and Methods for Its Corrosion Protection

摘要

It is inadmissible to employ the inhibitors of polyphosphate type, including KW/2353, for the corrosion protection of the inner surface of long-distance water mains. When becoming deficient due to its exhaustion, the inhibitor aggravates the localized corrosion. On the other hand, in sufficient concentration, it facilitates microbial corrosion, serving as a nutrient for microorganisms. The optimum method for the corrosion protection of the steel equipment contacting water media consists in their deoxygenation. Complex investigations, including corrosion-elecrochemical, physical and analytical tests, are necessary to predict both the rate and character of the corrosion of engineering equipment in contact with such media; the weighing procedures may be disinformative.