【摘要】：管道內(nèi)腐蝕是引起管道失效的主要因素之一,腐蝕監(jiān)測(cè)技術(shù)日益成為現(xiàn)代管道工業(yè)研究的熱點(diǎn)問(wèn)題。傳統(tǒng)的管道腐蝕監(jiān)測(cè)技術(shù)受限于工作環(huán)境與介質(zhì)環(huán)境,電化學(xué)方法不適用于非電解質(zhì)油氣管道的內(nèi)腐蝕監(jiān)測(cè),插入式電阻探針監(jiān)測(cè)數(shù)據(jù)只是管道內(nèi)的均勻腐蝕狀態(tài),對(duì)管道內(nèi)壁的局部腐蝕具有很大局限性。本文針對(duì)這些問(wèn)題,建立基于環(huán)形結(jié)構(gòu)電阻探針的管道內(nèi)壁腐蝕監(jiān)測(cè)實(shí)驗(yàn)平臺(tái),進(jìn)行長(zhǎng)期的腐蝕監(jiān)測(cè)與緩釋劑對(duì)管道作用效果的實(shí)驗(yàn),最后對(duì)實(shí)驗(yàn)結(jié)果進(jìn)行了分析討論。首先,采用電阻法結(jié)合電化學(xué)方法對(duì)同一電子試片進(jìn)行腐蝕監(jiān)測(cè),研究X65管線鋼在海水中的氧去極化腐蝕過(guò)程及特性。對(duì)比分析了失重法、電阻法、LPR和EIS四種監(jiān)測(cè)方法的腐蝕速率,實(shí)驗(yàn)發(fā)現(xiàn)電阻法在長(zhǎng)期腐蝕監(jiān)測(cè)種具有更高的準(zhǔn)確性,實(shí)驗(yàn)得到X65鋼在海水環(huán)境中的腐蝕速率為分布為0.06～0.36mma之間,為實(shí)驗(yàn)平臺(tái)的實(shí)驗(yàn)結(jié)果分析奠定數(shù)據(jù)基礎(chǔ)。其次,搭建基于電阻技術(shù)的的管道內(nèi)壁腐蝕監(jiān)測(cè)實(shí)驗(yàn)平臺(tái)。其核心為集成了環(huán)形探針的腐蝕監(jiān)測(cè)管線,研究預(yù)先完成了環(huán)形探針的溫度標(biāo)定實(shí)驗(yàn),得到腐蝕測(cè)量的初始參數(shù),然后完成了管道內(nèi)壁腐蝕的長(zhǎng)期監(jiān)測(cè)實(shí)驗(yàn)。實(shí)驗(yàn)結(jié)果顯示,管道內(nèi)壁腐蝕存在周向差異,底部沉積物等因素造成了管道周向的電位差異,形成了電偶腐蝕,底部為陽(yáng)極區(qū),腐蝕速率加��；實(shí)驗(yàn)平臺(tái)能實(shí)現(xiàn)管道周向的腐蝕監(jiān)測(cè),對(duì)管道周向局部腐蝕具有很好的敏感性；由于腐蝕產(chǎn)物與沉積物的作用,緩蝕劑對(duì)管道周向的作用效果存在差異。
[Abstract]:Pipeline internal corrosion is one of the main factors causing pipeline failure. Corrosion monitoring technology has become a hot issue in modern pipeline industry. The traditional pipeline corrosion monitoring technology is limited by the working environment and the medium environment. The electrochemical method is not suitable for the internal corrosion monitoring of non-electrolyte oil and gas pipelines. The plug-in resistance probe monitoring data is only the uniform corrosion state in the pipeline. It is very limited to the local corrosion of the inner wall of the pipeline. In order to solve these problems, an experimental platform of pipeline inner wall corrosion monitoring based on ring structure resistance probe is established, and the effect of corrosion monitoring and slow release agent on pipeline is tested for a long time. Finally, the experimental results are analyzed and discussed. Firstly, the corrosion process and characteristics of X65 pipeline steel under oxygen depolarization in seawater were investigated by means of resistance method and electrochemical method. The corrosion rates of weightlessness method, resistance method, LPR method and EIS method are compared and analyzed. It is found that the resistance method has higher accuracy in long-term corrosion monitoring. The results show that the corrosion rate of X65 steel in seawater environment is distributed between 0.06~0.36mma, which provides a data basis for the experimental results analysis of the experimental platform. Secondly, an experimental platform for corrosion monitoring of pipeline inner wall based on resistance technology is built. The core is the corrosion monitoring pipeline integrated with the ring probe. The temperature calibration experiment of the ring probe is completed in advance, the initial parameters of the corrosion measurement are obtained, and the long-term monitoring experiment of the corrosion of the inner wall of the pipeline is completed. The experimental results show that there are circumferential differences in the corrosion of the inner wall of the pipeline, and some factors, such as sediment at the bottom, cause the difference of the potential in the circumferential direction of the pipeline and form the galvanic corrosion, the bottom of which is the anode area, and the corrosion rate is aggravated. The experimental platform can realize pipeline circumferential corrosion monitoring and has good sensitivity to circumferential local corrosion of pipeline, and the effect of corrosion inhibitor on pipeline circumferential corrosion is different due to the effect of corrosion products and sediment.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TE988.2

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