TC4钛合金在有机盐完井液中的腐蚀性能

摘要: 针对钛合金在苛刻油田环境中的适用性，通过模拟腐蚀失重实验以及电化学测试分析，研究了TC4钛合金在高温高压完井液中的抗腐蚀及电化学腐蚀行为。结果表明，在总压为10 MPa，密度为1.4 g/cm³的甲酸钾完井液环境中经过360 h腐蚀，TC4钛合金有较高的腐蚀速率，其抗腐蚀性能较差，在210℃时，腐蚀速率达0.1361 mm/a。TC4钛合金阳极极化曲线均有钝化区，随温度升高，自腐蚀电流密度增大，腐蚀倾向性增大。电化学阻抗谱有明显的容弧特征，电荷转移电阻随温度升高减小很快，钝化膜的保护性减弱，表明TC4钛合金在高温高压甲酸钾完井液中的抗腐蚀性逐渐降低。
- TC4钛合金 /
- 腐蚀速率 /
- 极化曲线 /
- 阻抗
Abstract: Aiming at applicability of titanium alloy in harsh oilfield environment, the corrosion resistance and electrochemical corrosion behavior of TC4 titanium alloy in high temperature and high pressure completion fluid were studied with simulated corrosion weightlessness test and electrochemical test analysis. The results show that TC4 titanium alloy has high corrosion rate and poor corrosion resistance after 360 h corrosion in potassium formate completion fluid with total pressure of 10 MPa and density of 1.4 g/cm³. The corrosion rate reaches 0.1361 mm/a at 210℃. The anodic polarization curves of TC4 titanium alloy all have passivation zones at different temperatures. With the increase of temperature, the self-corrosion current density and corrosion tendency increase. The electrochemical impedance spectroscopy (EIS) has obvious arc capacitance characteristics. The charge transfer resistance decreases rapidly with the increase of temperature, and the protectivity of passive film decreases. This indicates that the corrosion resistance of TC4 titanium alloy in high temperature and high pressure potassium formate completion fluid decreases gradually.
- TC4 alloy /
- Corrosion rate /
- Polarization curve /
- Impedance

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