用旋转弯曲腐蚀疲劳试验研究碳钢在钻井液中的腐蚀疲劳行为,并用电化学滞后时间法研究钻井中碳钢的氢扩散行为。结果表明:钻井液中碳化物能促进原子氢进入碳钢基体,加速碳钢的腐蚀疲劳;咪唑啉类缓蚀剂可以抑制原子氢的生成,减小氢扩散作用,提高碳钢在钻井液中的腐蚀疲劳寿命;施加一定范围的阴极保护(-300～-700mV)可以延长钻井液中碳钢的腐蚀疲劳寿命。
The corrosion fatigue behavior of carbon steel in drilling fluids was investigated with a self-made rotary type bending corrosion fatigue testing apparatus under simulated drilling conditions. The hydrogen permeation into carbon steel in drilling fluids was studied by electrochemical method.Experimental results showed that sulfide addition into drilling fluid accelerated the corrosion fatigue failure of the steel by promoting hydrogen permeation. The imidazoline inhibitor (DPI-2) suppressed the generation of hydrogen atoms and hydrogen embrittlement and thus prolonged the corrosion fatigue life of carbon steel. Cathodic protection in a specific range of potential (-300～-700mV) could increase the corrosion fatigue resistance of carbon steel in drilling fluid, but excessive cathodic polarization would promote crack propagation and therefore would be harmful.
参考文献
| [1] |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%