本文選題：X100管線鋼 + 縫隙腐蝕��； 參考：《內(nèi)蒙古科技大學(xué)》2015年碩士論文

【摘要】：土壤對(duì)管線鋼的腐蝕不可避免，尤其是縫隙腐蝕對(duì)埋地管線鋼的破壞尤其嚴(yán)重�？p隙腐蝕主要是由于縫內(nèi)狹小空間造成內(nèi)外氧濃差與氯離子遷移產(chǎn)生的，氯離子大量遷移到縫隙內(nèi)破壞了縫內(nèi)金屬的鈍化狀態(tài)，縫隙內(nèi)形成閉塞電池，并且縫內(nèi)不斷進(jìn)行其自催化效應(yīng)，使得金屬嚴(yán)重腐蝕。本文應(yīng)用模擬縫隙裝置，實(shí)驗(yàn)選取我國(guó)江西鷹潭、新疆庫(kù)爾勒、內(nèi)蒙古伊盟三地具有代表性的酸性、堿性、中性土壤模擬溶液作為腐蝕介質(zhì)，研究了X100管線鋼在模擬縫隙裝置內(nèi)的縫隙腐蝕行為，并且研究了外加電流陰極保護(hù)法對(duì)縫隙腐蝕的影響，探索在酸堿中性土壤模擬環(huán)境下，X100管線鋼的縫隙腐蝕規(guī)律。 實(shí)驗(yàn)研究了X100管線鋼在模擬江西鷹潭、新疆庫(kù)爾勒、內(nèi)蒙古伊盟土壤溶液下的縫隙腐蝕行為。實(shí)驗(yàn)結(jié)果表明：X100管線鋼模擬縫隙試樣，在鷹潭、庫(kù)爾勒、伊盟土壤模擬溶液介質(zhì)下，縫內(nèi)溶液的Cl-濃度均隨時(shí)間的延長(zhǎng)而增加，并且在浸泡初期Cl-濃度增加迅速，浸泡時(shí)間超過(guò)20h后Cl-濃度增加較為緩慢。X100管線鋼在鷹潭土壤模擬溶液、庫(kù)爾勒土壤模擬溶液、伊盟土壤模擬溶液介質(zhì)下，隨浸泡時(shí)間的延長(zhǎng)，縫內(nèi)各位置處的電極電位E均有不同程度的降低；并且電極電位E從縫口到縫底逐步降低，說(shuō)明縫底處腐蝕最為嚴(yán)重。 實(shí)驗(yàn)研究了X100管線鋼在縫隙內(nèi)部的陰極極化特點(diǎn)，研究了極化時(shí)間、縫口陰極極化控電位、不同介質(zhì)等因素對(duì)縫內(nèi)極化電位的影響趨勢(shì)，并分析了在陰極保護(hù)條件下三種介質(zhì)下X100管線鋼的縫隙腐蝕的程度。結(jié)果表明：X100管線鋼模擬縫隙試樣，在鷹潭、庫(kù)爾勒、伊盟土壤模擬溶液介質(zhì)下，縫口通入-1000mVCS極化電壓，隨極化時(shí)間的延長(zhǎng)，縫內(nèi)各位置處的極化電位均呈梯度下降趨勢(shì)；在同一極化時(shí)間下，縫口到縫底極化電位呈一定梯度的增加趨勢(shì)，并且隨極化時(shí)間的延長(zhǎng)，縫口到縫底的極化電位變化梯度越不明顯；X100管線鋼模擬縫隙試樣，在鷹潭、庫(kù)爾勒、伊盟土壤模擬溶液介質(zhì)下，，隨著縫口通入控制電位的降低，縫內(nèi)各位置處的極化電位均呈現(xiàn)一定梯度的負(fù)移現(xiàn)象；當(dāng)極化電位為-1000mVCSE、-1150mVCSE時(shí)，縫內(nèi)各位置處極化電極均在臨界保護(hù)電壓以下，均達(dá)到陰極保護(hù)效果；當(dāng)縫口電壓為-850mVCSE時(shí)，鷹潭土壤模擬溶液介質(zhì)下，縫底深處為處于欠保護(hù)狀態(tài)。
[Abstract]:Soil corrosion to pipeline steel is inevitable, especially crevice corrosion to buried pipeline steel.Slot corrosion is mainly caused by the oxygen concentration difference and chloride ion migration in the narrow space of the gap. The chloride ions migrate to the gap to destroy the passivation state of the metal in the gap, and the closed cell is formed in the gap.And the self-catalytic effect is carried out continuously in the seam, which causes the metal to corrode seriously.In this paper, three representative acidic, alkaline and neutral soil simulated solutions in Yingtan, Xinjiang, and Yimeng, Inner Mongolia were selected as corrosion medium.The crevice corrosion behavior of X100 pipeline steel in simulated gap device was studied, and the effect of applied current cathodic protection on gap corrosion was studied, and the crevice corrosion law of X100 pipeline steel in acid-base neutral soil simulation environment was explored.The crevice corrosion behavior of X100 pipeline steel in simulated soil solution of Yingtan, Xinjiang and Inner Mongolia was studied.The experimental results show that the Cl-concentration of the solution in the soil of Yingtan, Korla and Yimeng increases with the prolongation of time, and the Cl-concentration increases rapidly in the initial stage of soaking.After soaking for more than 20 hours, the increase of Cl-concentration was slow. X100 pipeline steel in Yingtan soil simulation solution, Korla soil simulation solution, Yimeng soil simulation solution medium, with the prolongation of soaking time.The electrode potential E at each position in the seam decreased to different degrees, and the electrode potential E gradually decreased from the seam opening to the seam bottom, which indicated that the corrosion at the bottom of the joint was the most serious.The cathodic polarization characteristics of X100 pipeline steel in the gap are experimentally studied. The influence of polarization time, cathode polarization control potential and different media on the polarization potential in the gap are studied.The degree of crevice corrosion of X100 pipeline steel under three kinds of media under cathodic protection was analyzed.The results show that in the soil simulated solution medium of Yingtan, Korla and Yimeng, the polarization voltage of -1000mVCS enters through the seams of the WX100 pipeline steel, and the polarization potential at each position in the seam decreases with the prolongation of the polarization time.At the same polarization time, the polarization potential from the seam to the bottom of the seam increases with the prolongation of the polarization time, and the gradient of the polarization potential from the seam to the bottom of the seam is less obvious than that of the simulated slit specimen of the X100 pipeline steel in Yingtan, Korla.In the soil simulated solution medium, with the decrease of the control potential at the seams, the polarization potential at all positions in the seam showed a negative gradient, and when the polarization potential was -1000mVCSE-1150mVCSE,The polarization electrode at every position in the seam is below the critical protection voltage, and the cathodic protection effect is achieved, and when the slit voltage is -850mVCSE, the depth of the slit bottom is in the underprotected state in the simulated solution medium of Yingtan soil.
【學(xué)位授予單位】：內(nèi)蒙古科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG142.1

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