White rust control

Requirements for white rust control in a new cooling system are ... 

Rust of iron (the most abundant corrosion product), and white rust of zinc are examples of nonprotective oxides. Aluminum and magnesium oxides are more protective than iron and zinc oxides. Patina on copper is protective in certain atmospheres. Stainless steels are passivated and protected, especially in chloride-free aqueous environments due to a very thin passive film of Cr2C>3 on the surface of the steel. Most films having low porosities can control the corrosion rate by diffusion of reactants through the him. In certain cases of uniform general corrosion of metals in acids (e.g., aluminum in hydrochloric acid or iron in reducible acids or alkalis), a thin him of oxide is present on the metal surface. These reactions cannot be considered hlm-free although the him is not a rate-determining one.1... 

Extension of such new culture technology to other orange and white rust pathogens would enable the development of countless other rust species to control their specific weed hosts. 

Rust rost [ME, fr. OE rusP, akin to OE read red] (before 12c) n. The reddish, brittle coating formed on iron or its alloys resulting from exposure to humid atmosphere or chemical attach. Note—Not to be confused with white rust. Baboian R (2002) Corrosion engineer s handbook, 3rd edn. NACE International - The Corrosion Society, Houston, TX. Uhlig HH (1948, 1971, 2000) Corrosion and corrosion control. John Wiley and Sons Inc., New York. 

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