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Silicomolybdates as chloride pitting corrosion inhibitors for steel
Breakdown potentials of mild steel were measured in sodium chloride solutions at pH 11, with and without sodium silicates and molybdates. It was shown that there was a substantial increase in the passive film breakdown potential when the silicates and molybdates anions were added together compared to the individual anions. When used in 10-2 M sodium chloride, 10-3 M sodium molybdate plus 10-2 sodium silicate were required to raise the breakdown potential to about +90mv(SCE). This is compared with -70mv(SCE) for 10-2 M sodium silicate and -35mv(SCE) for 10-2 M sodium molybdate. Although these were laboratory conditions, they modelled the environment of sodium chloride contaminated cement being at high alkalinity (pH 11). These inhibitors appear to form insoluble compounds within the pits. Although pit initiation occurred, they soon stopped growing and were shallow and growth was short-lived.
Silicomolybdates as chloride pitting corrosion inhibitors for steel
Breakdown potentials of mild steel were measured in sodium chloride solutions at pH 11, with and without sodium silicates and molybdates. It was shown that there was a substantial increase in the passive film breakdown potential when the silicates and molybdates anions were added together compared to the individual anions. When used in 10-2 M sodium chloride, 10-3 M sodium molybdate plus 10-2 sodium silicate were required to raise the breakdown potential to about +90mv(SCE). This is compared with -70mv(SCE) for 10-2 M sodium silicate and -35mv(SCE) for 10-2 M sodium molybdate. Although these were laboratory conditions, they modelled the environment of sodium chloride contaminated cement being at high alkalinity (pH 11). These inhibitors appear to form insoluble compounds within the pits. Although pit initiation occurred, they soon stopped growing and were shallow and growth was short-lived.
Silicomolybdates as chloride pitting corrosion inhibitors for steel
Lee, C.M. (author) / Boden, P.J. (author)
2000
11 Seiten, 5 Bilder, 1 Tabelle, 7 Quellen
Conference paper
English
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