[中文文摘]用XPS分析不同离子选择性涂层下碳钢表层的化学组成 .结果表明 ,SO2 - 4 型阴离子选择性和Na+ 型阳离子选择性涂层下碳钢表面锈层的主要成分是含结合水的Fe(OH) 2 和少量FeO ,SO2 - 4 型阴离子选择性 /Na+ 型阳离子选择性双极涂层下碳钢表面的主要成分是Fe0 ,Fe2 + 所占比例很少 .在涂装阴离子选择性涂层的碳钢表面可以检测到比较明显的Cl- 的XPS信号 ,而在涂装阳离子选择性涂层和双极性涂层的碳钢表面则不明显 .[英文文摘]Ion-selective (anion-selective,cation-selective and bipolar) phenolic coatings were prepared by mixing phenolic varnish with ion exchangers.SO 2- 4-type anion exchanger resin and Na +-type cation exchanger resin were utilized as anion and cation exchangers respectively.The bipolar coating consisted of an anion-selective inner layer and a cation-selective outer layer.The corrosion compositions of carbon steel depriving of the painted ion-selective coatings after exposure in 3%NaCl solution for 30 days were investigated by XPS. The research result s of XPS showed that the main compositions in the surface layer of carbon steel are Fe2 + ,OH- ,O2 - and Cl- under SO2-4 - type anion - selective coating ,whereas the main compositions are Fe2 + , Fe0 ,
OH- ,and O2 - under Na + - type cation - selective and SO2 -4 - type anion - selective / Na + -type cation - selective bipolar coatings. The XPS signal of Cl - can be inspected obviously on the
surface layer of carbon steel with anion - selective coating ,whereas there is no obvious signal in the case of cation - selective and bipolar coatings. This indicated that Cl - could migrate from the NaCl solution to the subst rate metal when carbon steel covered with anion - selective coating ,whereas the migration of Cl- would be blocked in the case of cation -selective and bipolar coatings. From these results
,it can be concluded that SO2-4 - type anion - selective coating has poor
corrosion resistance , Na + - type cation - selective coating has better corrosion resistance , and SO2-4 -type anion - selective/ Na + - type cation - selective bipolar coating has excellent corrosion resistance
