【摘要】：灘涂作為我國(guó)重要的六大后備土地資源之一,在資源短缺環(huán)境日益惡化的21世紀(jì)迅速走進(jìn)人們視線,濱海灘涂港口城鎮(zhèn)的建設(shè)、石油化工等工業(yè)的發(fā)展離不開(kāi)大量的鋼鐵設(shè)施,而鋼鐵設(shè)施的腐蝕問(wèn)題嚴(yán)重威脅著人民生命財(cái)產(chǎn)的安全,尤其是在濱海灘涂這種高鹽分高濕熱的苛刻環(huán)境中,金屬材料的腐蝕問(wèn)題不容忽視。本文以工程設(shè)施常用材料Q235鋼和長(zhǎng)輸油氣管道常用材料X80管線鋼為研究對(duì)象,采用電化學(xué)交流阻抗和動(dòng)電位極化曲線技術(shù),結(jié)合腐蝕形貌觀察,研究了X80管線鋼和Q235鋼兩種材料在濱海灘涂土壤中的腐蝕行為及規(guī)律,并研究了溫度和土壤模擬液濃度對(duì)X80管線鋼和Q235鋼腐蝕行為的影響。研究表明,X80管線鋼和Q235鋼在濱海灘涂土壤模擬液中的短期腐蝕行為均經(jīng)歷了三個(gè)階段:連續(xù)致密的腐蝕產(chǎn)物膜未形成時(shí)的腐蝕初期;形成有良好保護(hù)作用的連續(xù)致密腐蝕產(chǎn)物膜,鋼基體腐蝕速率明顯減小的腐蝕中期;由于疏松外銹層脫落導(dǎo)致腐蝕速率增大的腐蝕后期。在25℃~60℃的溫度范圍內(nèi),溫度升高能加快X80管線鋼和Q235鋼在濱海灘涂土壤模擬液(濃度20g/L~80g/L)中的腐蝕速率;在20g/L~80g/L濃度范圍內(nèi),濃度愈高,濱海灘涂土壤模擬液中溶氧量越低,Q235鋼的腐蝕速率愈小,而對(duì)于X80管線鋼,在25℃~50℃時(shí),濃度越高,電極腐蝕速度會(huì)由于溶氧量的減少而減小,溫度達(dá)到60℃,溶氧量對(duì)腐蝕的影響不明顯。
[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，

本文編號(hào)：2135058