摘要
以优选工艺,进行单宁酸溶液处理Fe-30Mn-2.7S i恒弹性合金,在其表面形成化学转化膜.采用X射线衍射与扫描电镜及在1 mol/L Na2SO4溶液中测定阳极极化曲线与电化学阻抗谱等技术研究化学转化膜的结构、成膜机制与提高其耐电化学腐蚀性能的效果.依据在Fe-30Mn-2.7S i合金表面进行10%CuSO2滴浸的加速腐蚀实验,初步选定较优的单宁酸反应成膜工艺条件.这种转化膜很可能是由有一定孔隙的非晶态合金单宁酸膜层构成.在1 mol/L Na2SO4溶液中,由阳极极化曲线与电化学阻抗谱等参数表征单宁酸转化膜的抗腐蚀性能优于Fe-30Mn-2.7S i合金基体.文中还简要地讨论单宁酸转化膜的结构与电化学性能.
Forming mechamism and anti-corrosion effect of a chemical conversion film formed on a Fe-30Mn-2.7Si alloy by tannin treatment have been studied using X-ray diffraction and scanning electron microscopy analysis, anodic polarization and electrochemical impedance spectroscopy in 1 mol/L Na2SO4 solution. Optimum process of tannic reaction for forming film was selected by accelerated corrosion test with 10% CuSO2 solution dipping on Fe-30Mn- 2.7Si alloy. The conversion film is probably constituted of amorphous and pored alloying tannate chelate. Corrosion resistance of tannic film characterized by anadic polarization curves and impedance spectroscopy are superior to that of Fe-30Mn- 2.7Si alloy. Structure and electrochemical properties of the tannic conversion film have been discussed in brief.
出处
《大连铁道学院学报》
2006年第1期66-70,共5页
Journal of Dalian Railway Institute
