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首页> 外文期刊>International Journal of Electrochemical Science >Electrochemical Studies of Titanium and its Ti-6Al-4V Alloy in Phosphoric Acid Solutions
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Electrochemical Studies of Titanium and its Ti-6Al-4V Alloy in Phosphoric Acid Solutions

机译：钛及其钛-6Al-4V合金在磷酸溶液中的电化学研究

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摘要

The influence of phosphoric acid concentration and temperature on the electrochemical behavior ofpure Ti and Ti-6Al-4V alloy was investigated using electrochemical techniques. The open circuitpotential (OCP) and electrochemical impedance results over a wide range of concentration (1.0-14 M)showed that Ti appears more corrosion resistant than its alloy. Two different types of behavior wereobserved for Ti and its alloy, in the concentration range up to 4.0M for Ti and 3.0M for the alloy, theOCP exhibits initial positive shift in potential associated with thickening of the oxide film formed onthe material surface, after that and as the acid concentration is increased to higher values, the potentialchanges towards more negative values due to its thinning and dissolution. The electrochemicalimpedance spectroscopy (EIS) confirms this trend as can be identified by the values of the resistanceRox and the oxide thickness 1/cox. On the other hand, at any given temperature, titanium exhibits higher-1 thickening rate ( / nm decade ) for its oxide film growth in 1.0 M H3PO4 medium.
机译：利用电化学技术研究了磷酸浓度和温度对纯Ti和Ti-6Al-4V合金电化学行为的影响。在很宽的浓度范围（1.0-14 M）下，开路电位（OCP）和电化学阻抗结果表明，钛比其合金更耐腐蚀。对于Ti及其合金，观察到两种不同类型的行为，在Ti的浓度范围最大为4.0M，合金的浓度范围为3.0M时，OCP在与材料表面上形成的氧化膜变厚相关的电位上显示出初始的正位移。随着酸浓度增加到更高的值，由于其稀化和溶解，电势朝着更大的负值变化。电化学阻抗谱（EIS）证实了这一趋势，可以通过电阻值Rox和氧化物厚度1 / cox来确定。另一方面，在任何给定温度下，钛在1.0 M H3PO4介质中的氧化膜生长均表现出更高的1增厚速率（/ nm十倍）。

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