阳极氧化
材料科学
腐蚀
线性扫描伏安法
塔菲尔方程
X射线光电子能谱
合金
氧化物
循环伏安法
计时安培法
扫描电子显微镜
极化(电化学)
无定形固体
缓蚀剂
冶金
化学工程
无机化学
电化学
电极
复合材料
化学
结晶学
物理化学
铝
工程类
作者
Alejandra Leonor Martínez,Daniel Omar Flamini,S.B. Saidman
标识
DOI:10.1016/s1003-6326(22)65917-x
摘要
Colorful thin oxide films were synthesized by galvanostatic anodization on Ti-6Al-4V alloy. Three different aqueous solutions containing corrosion inorganic inhibitors (Na2MoO4, NaH2PO4 and NH4VO3) were employed for the anodization treatment. The effect of inhibitor anions on the corrosion behavior of the alloy in Ringer solution was studied. Open circuit potential (OCP), Tafel polarization, linear sweep voltammetry (LSV) and chronoamperometry (CA) were performed to evaluate the corrosion performance of the treated electrodes. The incorporation of the inhibitor ions was detected by the release of Mo, V and P through ICP-AES technique. The formed oxides were characterized by scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS). The results show that compact, amorphous oxides without pores or cracks were obtained independently of the solution used. The sample anodized in Na2MoO4 solution registered the lowest corrosion current density (0.11 μA/cm2), and it was able to protect the alloy even after 168 h of immersion in Ringer solution. No cracks or corrosion products were detected. The XPS analysis reveals the incorporation of molybdenum to the oxide film in the form of Mo6+ and Mo4+.
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