本文選題：碳鋼　切入點(diǎn)：緩蝕劑　出處：《江西理工大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：碳鋼在不同介質(zhì)中的腐蝕機(jī)理各不相同,本文從多種介質(zhì)入手,研究碳鋼的腐蝕規(guī)律和機(jī)理。實(shí)驗(yàn)分為油田水處理區(qū)現(xiàn)場(chǎng)腐蝕實(shí)驗(yàn)和實(shí)驗(yàn)室靜態(tài)掛片實(shí)驗(yàn)。油田現(xiàn)場(chǎng)實(shí)驗(yàn)分為現(xiàn)場(chǎng)取樣模擬實(shí)驗(yàn)和水處理區(qū)現(xiàn)場(chǎng)投放掛片在線實(shí)驗(yàn)。從水處理區(qū)腐蝕實(shí)驗(yàn)中統(tǒng)計(jì)碳鋼在油氣處理廠水處理區(qū)的腐蝕趨勢(shì)和規(guī)律。通過(guò)實(shí)驗(yàn)室靜態(tài)掛片實(shí)驗(yàn)電化學(xué)實(shí)驗(yàn)研究碳鋼在HF介質(zhì)中腐蝕機(jī)理,并設(shè)計(jì)合成相應(yīng)的酸化用緩蝕劑。緩蝕劑通過(guò)硫脲與L-半胱氨酸的酰化反應(yīng)制備得到,目標(biāo)主產(chǎn)物為(2-氨基-2-巰基-乙�；�)-硫脲(ASAT)。緩蝕劑分別在1%,2%和5%HF中進(jìn)行研究;實(shí)驗(yàn)溫度設(shè)計(jì)為常溫、40℃、45℃。通過(guò)靜態(tài)掛片法、Langmuir等溫吸附線、阻抗譜(EIS)、極化曲線等手段研究碳鋼在HF介質(zhì)中的腐蝕機(jī)理以及緩蝕劑的效果和緩蝕機(jī)理。采用靜態(tài)掛片法和Langmuir等溫吸附法來(lái)研究腐蝕介質(zhì)中緩蝕劑在碳鋼表面的吸附情況,經(jīng)過(guò)計(jì)算得出緩蝕劑在碳鋼表面的吸附模型為單分子層化學(xué)吸附。緩蝕劑在碳鋼表面的吸附反應(yīng)可分為兩種情況:(1)高溫下有發(fā)生吸附反應(yīng)的趨勢(shì)但不自發(fā)吸附,(2)低溫下有發(fā)生吸附反應(yīng)的趨勢(shì),可以自發(fā)吸附。通過(guò)極化曲線與阻抗譜可以看出緩蝕劑在此系統(tǒng)中起到了一定的緩蝕效果,探究出碳鋼在HF中的腐蝕機(jī)理以及腐蝕速率同介質(zhì)溫度、HF濃度之間的關(guān)系,同時(shí)分析得出以(2-氨基-2-巰基-乙�；�)-硫脲為主要成分的緩蝕劑的緩蝕機(jī)理。極化曲線表明該緩蝕劑為陽(yáng)極型緩蝕劑。對(duì)比各溫度下的實(shí)驗(yàn)數(shù)據(jù)發(fā)現(xiàn),溫度和HF濃度越高,腐蝕電流密度越大,腐蝕速率越快,溫度和氫氟酸濃度會(huì)影響碳鋼的腐蝕速率。在光學(xué)顯微鏡下觀察發(fā)現(xiàn),碳鋼在各濃度HF介質(zhì)中腐蝕一段時(shí)間后會(huì)出現(xiàn)均勻腐蝕和點(diǎn)蝕現(xiàn)象,在掃面電鏡下發(fā)現(xiàn)針狀腐蝕產(chǎn)物疏松的堆積在碳鋼表面。
[Abstract]:The corrosion mechanism of carbon steel in different media is different. The corrosion law and mechanism of carbon steel were studied. The experiments were divided into field corrosion experiment in oilfield water treatment area and static hanging sheet experiment in laboratory. The corrosion tendency and regularity of carbon steel in water treatment area of oil and gas treatment plant were analyzed from the corrosion experiment of water treatment area. The corrosion mechanism of carbon steel in HF medium was studied by electrochemical experiment of static hanging sheet in laboratory. The corrosion inhibitor was prepared by acylation of thiourea and L-cysteine. The main product was 2-amino-2-mercapto-acetyl-thiourea. The inhibitor was studied in 1% and 5HF, respectively. The experimental temperature was designed as normal temperature 40 鈩，

本文編號(hào)：1567499