Effect Of The Different Ph Acidity To The Corrosion Behavior Of X70ce Steel In Different Soil Simulated Solution

In this paper, we mainly study the corrosion of X70 and X70Ce in 4 different simulated solution(Baotou Kuerle Yimeng Yingtan), and study corrosion of the two steels in different pH solutions.Firstly, the result of X70 and X70Ce dipped in NaCl solution with different pH (3.5,7.5,9.5) for 45 days shows that the surface of the samples are corrupted uneven, as the planting time and PH increasing, the corrosive rate is going up; the EIS and polarization curves of different time shows that the corrosive rate of X70Ce pipe steels is lower than the one of X70, the solution of pH is 3.5 is the most corrupted, the second corrupted one's PH is 7.5, the third one's pH is 7.5. The corrosive offspring showed by XRD is mainly including iron oxide, iron chloride and sulfid.Secondly, X70Ce steel and X70 steel and steel were immersed in four kinds of simulated solution. They were corroded most seriouly in Yingtan simulation solution, The second serious solution is KuErLe soil solution, the thirdly serious corrosion solution is Baotou simulated solutions, corrosion lightest solution is YiMeng soil simulation solution. Polarization curve and impedance spectrum results show that with extension of soak time, corrosion current density was increased firstly and then decreased in Yingtan soil simulation solution. The mainly reason of corrosion rate increases firstly and then decreases is that dense rust layer discontinuous early, protective effects of the steel can not afford, rust layer has sufficient thickness and density in medium-term, it has some protective effect on the steel substrate, as time moves on, the outer layer of rust off, leading to corrosion increases again again. In the other three soil simulation solution, with the time increasing, more and more serious corrosion. Uniform corrosion occur inYimeng and Baotou simulated soil solution. Pitting occurs in Korla and Yingtan simulation soil solution. Pitting is more seriously in Yingtan simulation soil solution.Finally, Comparing the corrosions of X70 and X70Ce in 4 different simulated solutions with the ones of them in different pH, the result shows that, the addition of CE could improve the causticity of the steels...