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通过动电位极化、电化学阻抗和浸泡失重等方法,考察了X80钢在含有不同浓度CO2的库尔勒土壤模拟溶液中的腐蚀行为,采用扫描电镜对腐蚀形貌进行了观察。结果表明:当土壤模拟溶液中通入的CO2和N2的体积比分别为CO2∶N2=10∶90,20∶80和30∶70时,不同浓度的CO2都促进了X80钢在库尔勒土壤介质中的腐蚀速率。这主要是因为通入的CO2使模拟溶液的p H值显著下降,导致溶液变为酸性,腐蚀过程由原来的氧控制变为了析氢反应为主,阴极反应过程进一步加快。另一方面,溶液中存在的CO2增加了X80钢表面腐蚀产物膜的缺陷,对基体的保护作用下降。这些因素导致X80钢的腐蚀速率增大。
The corrosion behavior of X80 steel in simulated solution of Korla soil with different CO2 concentrations was investigated by potentiodynamic polarization, electrochemical impedance and immersion weight loss. The corrosion morphology was observed by scanning electron microscopy. The results show that when the volume ratio of CO2 to N2 in the simulated soil solution is CO2: N2 = 10:90, 20:80 and 30:70 respectively, different concentrations of CO2 promote the growth of X80 steel in Korla soil medium The corrosion rate. This is mainly due to the introduction of CO2 so that the p H value of the simulated solution significantly decreased, resulting in the solution becomes acidic, the corrosion process from the original oxygen control into a hydrogen evolution reaction, cathode reaction further accelerated. On the other hand, the presence of CO2 in the solution increases the defect of the corrosion product film on the surface of X80 steel and decreases the protective effect on the substrate. These factors led to X80 steel corrosion rate increases.