高盐分高湿热滩涂地带X80管线钢和Q235钢腐蚀行为研究
发布时间：2018-07-21 09:18
【摘要】：滩涂作为我国重要的六大后备土地资源之一,在资源短缺环境日益恶化的21世纪迅速走进人们视线,滨海滩涂港口城镇的建设、石油化工等工业的发展离不开大量的钢铁设施,而钢铁设施的腐蚀问题严重威胁着人民生命财产的安全,尤其是在滨海滩涂这种高盐分高湿热的苛刻环境中,金属材料的腐蚀问题不容忽视。本文以工程设施常用材料Q235钢和长输油气管道常用材料X80管线钢为研究对象,采用电化学交流阻抗和动电位极化曲线技术,结合腐蚀形貌观察,研究了X80管线钢和Q235钢两种材料在滨海滩涂土壤中的腐蚀行为及规律,并研究了温度和土壤模拟液浓度对X80管线钢和Q235钢腐蚀行为的影响。研究表明,X80管线钢和Q235钢在滨海滩涂土壤模拟液中的短期腐蚀行为均经历了三个阶段:连续致密的腐蚀产物膜未形成时的腐蚀初期;形成有良好保护作用的连续致密腐蚀产物膜,钢基体腐蚀速率明显减小的腐蚀中期;由于疏松外锈层脱落导致腐蚀速率增大的腐蚀后期。在25℃~60℃的温度范围内,温度升高能加快X80管线钢和Q235钢在滨海滩涂土壤模拟液(浓度20g/L~80g/L)中的腐蚀速率;在20g/L~80g/L浓度范围内,浓度愈高,滨海滩涂土壤模拟液中溶氧量越低,Q235钢的腐蚀速率愈小,而对于X80管线钢,在25℃~50℃时,浓度越高,电极腐蚀速度会由于溶氧量的减少而减小,温度达到60℃,溶氧量对腐蚀的影响不明显。
[Abstract]:As one of the six important reserve land resources in our country, the tidal flat has come into the sight of people in the 21st century when the resource shortage and environment are worsening day by day. The development of port towns and petrochemical industry along the coastal beach can not be separated from a large number of iron and steel facilities. The corrosion problem of iron and steel facilities is a serious threat to the safety of people's lives and property. Especially in the harsh environment of high salinity and high humidity and heat the corrosion problem of metal materials can not be ignored. In this paper, Q235 steel, a common material used in engineering facilities, and X80 pipeline steel, a common material for oil and gas pipelines, are studied. Electrochemical impedance and potentiodynamic polarization curves are used to observe the corrosion morphology of Q235 steel and X80 pipeline steel. The corrosion behavior and regularity of X80 pipeline steel and Q235 steel in coastal shoal soil were studied. The effects of temperature and soil simulated liquid concentration on corrosion behavior of X80 pipeline steel and Q235 steel were studied. The results show that the short-term corrosion behavior of X80 pipeline steel and Q235 steel in the simulated solution of coastal beach soil has experienced three stages: the initial corrosion of continuous dense corrosion product film is not formed; A continuous dense corrosion product film with good protective effect was formed, the corrosion rate of steel substrates decreased obviously in the middle of the corrosion period, and the corrosion rate increased in the late stage due to the loose outer rust layer falling off. In the temperature range of 25 鈩，
本文编号：2135058
[Abstract]:As one of the six important reserve land resources in our country, the tidal flat has come into the sight of people in the 21st century when the resource shortage and environment are worsening day by day. The development of port towns and petrochemical industry along the coastal beach can not be separated from a large number of iron and steel facilities. The corrosion problem of iron and steel facilities is a serious threat to the safety of people's lives and property. Especially in the harsh environment of high salinity and high humidity and heat the corrosion problem of metal materials can not be ignored. In this paper, Q235 steel, a common material used in engineering facilities, and X80 pipeline steel, a common material for oil and gas pipelines, are studied. Electrochemical impedance and potentiodynamic polarization curves are used to observe the corrosion morphology of Q235 steel and X80 pipeline steel. The corrosion behavior and regularity of X80 pipeline steel and Q235 steel in coastal shoal soil were studied. The effects of temperature and soil simulated liquid concentration on corrosion behavior of X80 pipeline steel and Q235 steel were studied. The results show that the short-term corrosion behavior of X80 pipeline steel and Q235 steel in the simulated solution of coastal beach soil has experienced three stages: the initial corrosion of continuous dense corrosion product film is not formed; A continuous dense corrosion product film with good protective effect was formed, the corrosion rate of steel substrates decreased obviously in the middle of the corrosion period, and the corrosion rate increased in the late stage due to the loose outer rust layer falling off. In the temperature range of 25 鈩，
本文编号：2135058
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