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03426 MEASUREMENT OF CORROSION IN SATURATED SOLUTIONS UNDER SALT DEPOSITS USING COUPLED MULTIELECTRODE ARRAY SENSORS

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Product Number: 51300-03426-SG
ISBN: 03426 2003 CP
Author: Lietai Yang, Roberto T. Pabalan, Lauren Browning, and Gustavo A. Cragnolino
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The corrosion rates of type 1010 carbon steel, and types 304 and 316 stainless steels in saturated solutions under salt deposits were measured using coupled multielectrode sensors. The measurements were carried out in the presence of the following salts: KCl, NaCl, NaNO3, MgCl2, NiCl2, FeCl3, FeCl2, CuCl2, and an NaCl+NaNO3 mixture. The results indicate that the corrosiveness of the salts increased in the following order: KCl ~ NaCl ~ NaNO3 ~ NaCl+NaNO3 ~ MgCl2 < NiCl2 < FeCl3 < FeCl2 < CuCl2 for carbon steel, and KCl ~ NaCl ~ MgCl2 ~ NiCl2 ~ NaCl+NaNO3 < FeCl3 ~ FeCl2 ~ CuCl2 for type 304 stainless steel. Some inhibition of corrosion of type 316 stainless steel by NaNO3 was observed in a mixture of NaCl+NaNO3, but not in pure NaNO3 solution. Key words: galvanically coupled sensor, multiple-electrode sensor, multielectrode, wire beam electrode, localized corrosion, salt deposit corrosion, under salt corrosion
The corrosion rates of type 1010 carbon steel, and types 304 and 316 stainless steels in saturated solutions under salt deposits were measured using coupled multielectrode sensors. The measurements were carried out in the presence of the following salts: KCl, NaCl, NaNO3, MgCl2, NiCl2, FeCl3, FeCl2, CuCl2, and an NaCl+NaNO3 mixture. The results indicate that the corrosiveness of the salts increased in the following order: KCl ~ NaCl ~ NaNO3 ~ NaCl+NaNO3 ~ MgCl2 < NiCl2 < FeCl3 < FeCl2 < CuCl2 for carbon steel, and KCl ~ NaCl ~ MgCl2 ~ NiCl2 ~ NaCl+NaNO3 < FeCl3 ~ FeCl2 ~ CuCl2 for type 304 stainless steel. Some inhibition of corrosion of type 316 stainless steel by NaNO3 was observed in a mixture of NaCl+NaNO3, but not in pure NaNO3 solution. Key words: galvanically coupled sensor, multiple-electrode sensor, multielectrode, wire beam electrode, localized corrosion, salt deposit corrosion, under salt corrosion
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