后注浆灌注桩的管道在不同模拟环境中的耐蚀性研究

Research on Corrosion Resistance of Pipeline Used on Post Grouting Pile in Different Simulation Environment

以后注浆灌注桩用13Cr钢管为研究对象,研究了在不同温度、不同CO_2分压和不同Cl^-浓度下钢管的腐蚀行为,并分析了其腐蚀机理。结果表明,在温度为180℃、CO_2分压为3MPa以及Cl^-浓度为100000mg/L时,钢管的腐蚀速率达到最大0.08 mm/a时,仍然保持着良好的耐腐蚀性能;Cr元素主要以Cr_2O_3形式存在于表面钝化膜中,在表面富集Cr_2O_3后可有效降低腐蚀速率。

Taking 13Cr steel used on grouting pile as research object, the corrosion behavior of the steel was studied at different temperatures, different CO2 partial pressure and different Cl- concentration, and then, the corrosion mechanism was analyzed. The results show that, at 180℃ the partial pressure of CO2 for 3MPa and Cl- concentration for 100000 mg/L, the corrosion rate of the steel reach the maximum of 0.08 mm/a, which still maintains a good corrosion resistance. Cr elements mainly exist in the surface passivation film with the form of Cr2O3. The surface enrichment of Cr2O3 can effectively reduce the corrosion rate.