CORROSION COMPOSITIONS OF CARBON STEELUNDER ION-SELECTIVE COATINGS BY XPS

J Chin Soc Corr Pro

2001, Vol. 21

Issue (5): 273-279 DOI:

Research Report

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CORROSION COMPOSITIONS OF CARBON STEELUNDER ION-SELECTIVE COATINGS BY XPS

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厦门大学材料科学与工程系

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Abstract Ion-selective (anion-selective,cation-selective and bipolar) phenolic coatings were prepared by mixing phenolic varnish with ion ex changers.SO2-4-type anion exchanger resin and Na+-type cation exchange r resin were utilized as anion and cation exchangers respectively.The bipolar co ating consisted of an anion-selective inner layer and a cation-selective outer l ayer.The corrosion compositions of carbon steel depriving of the painted ion-sel ective coatings after exposure in 3%NaCl solution for 30 days were investigated by XPS.The research results of XPS showed that the main compositions in the surf ace layer of carbon steel are Fe2+,OH-,O2- and Cl-under SO2- 4-type anion-selective coating,whereas the main compositions are Fe2+, Fe0,OH-,and O2- under Na+-type cation-selective and SO2-4-ty pe anion-selective / Na+-type cation-selective bipolar coatings.The XPS signal o f Cl-can be inspected obviously on the surface layer of carbon steel with anio n-selective coating,whereas there is no obvious signal in the case of cation-sel ective and bipolar coatings.This indicated that Cl- could migrate from the NaC l solution to the substrate metal when carbon steel covered with anion-selective coating,whereas the migration of Cl- would be blocked in the case of cation-se l ective and bipolar coatings.From these results,it can be concluded that SO2- 4-type anion-selective coating has poor corrosion resistance,Na+-type cati on-selective coating has better corrosion resistance,and SO2-4-type anio n-selective/Na+-type cation-selective bipolar coating has excellent corrosion resistance.

Key words: ion-selective coating carbon steel corrosion compositi on XPS

Received: 07 July 2000

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. CORROSION COMPOSITIONS OF CARBON STEELUNDER ION-SELECTIVE COATINGS BY XPS. J Chin Soc Corr Pro, 2001, 21(5): 273-279 .

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https://www.jcscp.org/EN/ OR https://www.jcscp.org/EN/Y2001/V21/I5/273

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