采用粉末冶金和轧制工艺制备出TZM合金和稀土镧掺杂的La-TZM合金,通过动电位极化研究合金电化学腐蚀行为,扫描电子显微镜观察、能谱定量分析表征腐蚀产物显微结构特征.保持Cl-浓度不变分别探讨合金在中性、酸性、碱性介质中耐侵蚀能力.结果表明,TZM合金在中性和碱性介质中抗腐蚀性能优于La-TZM合金,而在酸性介质中La-TZM合金抗腐蚀性能优于TZM合金,两类合金抗腐蚀性均表现为酸性介质强于中性介质,碱性介质最弱.Cl-有效破坏腐蚀表面形成的钝化膜,OH-和Cr双重侵蚀促使两类合金晶间腐蚀加剧、粉末冶金制备的TZM合金及La-TZM合金对酸性介质具有良好的耐蚀性.
Titanium-zirconium-molybdenum (TZM) alloy and rare earth lanthanum doped La-TZM alloy were fabricated using powder metallurgy and roiling technique.Their electrochemical corrosion behavior was studied quantitatively using potentiodynamic polarization,scanning electron microscope and energy spectrum techniques.Their corrosion behavior was investigated in neutral,acidic and alkaline medium,while keeping the CI concentrations invariant.The results show that the corrosion resistance of the tested TZM alloy is better than that of the La-TZM alloy in neutral and alkaline media,while in an acidic medium,the La-TZM alloy is better.It is also found that the alloys are more corrosion-resistant in an acidic medium than in a neutral medium,and are the least corrosion-resistant in an alkaline medium.Finally,we find that Cl-effectively destroys the passivation film formed on the corrosion surface;OFF and C1-double erosion promoted these two types of alloy intergranular corrosion increased.
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