摘要
采用电化学方法研究了块体Mg65Cu25Gd10非晶合金在0.01mol/L,pH=13的NaCl溶液及0.1mol/L,pH=13的NaOH溶液中的腐蚀行为。在2种电解质溶液中,非晶合金样品的极化曲线具有明显的钝化区和较低的钝化电流密度。浸蚀样品的表面形貌和腐蚀产物采用SEM和EDS来表征。恒电位钝化后样品表面层化学信息运用DP-XPS来考察。结果表明,样品在NaOH溶液中形成致密少孔的钝化膜,而在含Cl离子的溶液中,样品表面钝化膜疏松且多孔,导致合金在含Cl离子的溶液中具有较低的耐蚀性。
The corrosion behavior of bulk amorphous Mg65Cu25Gd10 alloy was studied by electrochemical measurement. The potentiodynamic polarization tests were carried out in 0.01 mol/L NaCI solution and 0.1 mol/L NaOH solution with pH=13. The amorphous Mg65Cu25Gd10 alloy was spontaneously passivated at a significantly low passivation current density in the two kinds of solutions. The surface morphology and corrosive products of samples after dipping tests were characterized by scanning electron microscopy （SEM） and energy dispersion spectroscopy （EDS）. The potentiostatically formed surface layers on Mg65Cu25Gd10 were investigated with a depth profile X-ray photoelectron spectroscopy （DP-XPS）. The results show that the potentiostatically formed surface layer in NaOH solution is more compact and less porous than that in NaCl solution, indicating that the Mg65Cu25Gd10 alloy has a better corrosion resistance in the solution without Cl^-.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第1期110-114,共5页
Rare Metal Materials and Engineering
基金
国家863项目(2003AA305071)
