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采用矩形缝隙装置,通过对X70/酸性土壤(鹰潭)浸出液体系进行阴极极化、通入CO2和钢表面预腐蚀,研究了X70钢在酸性土壤中的缝隙腐蚀行为.实验测量了模拟剥离涂层下,X70钢在不同位置的电位、溶液pH及氧含量随时间的变化曲线.结果表明,酸性土壤环境中,随着阴极极化程度增加,缝内X70钢电位负移,缝内外电位差加大,缝内过剩的阴极电流导致H2O还原使溶液pH升高.缝内溶解氧耗尽与外加阴极电流没有关系.CO2的存在抑制了缝隙内碱性溶液环境的形成,导致近中性pH应力腐蚀产生的电位-pH环境.钢表面的预腐蚀产物降低了缝内的极化速率.
The rectangular crevice device was used to study the crevice corrosion behavior of X70 steel in acid soils by cathodic polarization of X70 / acid soil (Yingtan) leachate system and the pre-corrosion of CO2 and steel surface.The effects of simulated peel coating , The potential of X70 steel at different positions, the pH value of solution and the content of oxygen with time.Results show that with the increase of cathodic polarization, the potential of X70 steel in the suture is negatively shifted and the potential difference between the inside and outside of the suture increases The excess cathode current in the seam leads to the reduction of H 2 O to increase the pH of the solution.The depletion of dissolved oxygen in the seam has no relation with the applied cathodic current.The presence of CO 2 inhibits the formation of alkaline solution in the interstitial environment and leads to near-neutral pH stress Potential produced by corrosion - pH environment Pre-etched products on the steel surface reduce the polarization rate within the seam.