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高溫高壓噴射條件下X70管線鋼的CO2腐蝕形貌

CO2 corrosion morphology of X70 pipeline steel under jet impingement at high temperature and high pressure environment

  • 摘要: 利用自主研發的高溫高壓環路噴射裝置并結合流體動力學模擬計算,研究了高溫高壓CO2環境流體噴射條件下X70鋼的腐蝕產物微觀形貌、基體表面三維形貌、腐蝕減薄量及其統計規律,并探討了與流體狀態之間的關系.結果表明,高溫高壓流體噴射條件下,不同流態區域內流體傳質速率和壁面切應力的差異是造成X70鋼腐蝕產物、基體表面三維形貌及腐蝕減薄量差異的主要原因.按照層流區→壁面噴射區→過渡區的順序,流體壁面切應力逐漸增加,不斷減薄腐蝕產物膜直至其脫落,造成傳質過程阻力減小,傳質速率增大,腐蝕過程不斷加劇.因此,按照層流區→壁面噴射區→過渡區的順序,X70鋼表面腐蝕產物膜由完整致密向疏松多孔變化,基體表面三維形貌呈現平坦→陡峭→非常陡峭的特征,三維表面高度偏差和均方根偏差、腐蝕減薄量平均值和標準差均呈現逐漸增大的趨勢.在高溫高壓流體噴射條件下,X70鋼的CO2腐蝕速率與壁面切應力之間較好地滿足指數關系.

     

    Abstract: The CO2 corrosion behavior of X70 pipeline steel, including the corrosion product's morphology, three-dimensional surface topography, and corrosion thickness reduction as well as its statistical analysis, was investigated in high temperature and high pres-sure CO2 environment using self-developed loop jet impingement apparatus and computation fluid dynamic (CFD) technique. The relationship between the obtained results and flow regimes under jet impingement was also discussed. It is found that the differences of fluid mass transfer and wall shear stress distributed on the steel surface located at different flow regimes are the main reason for the differences of the corrosion product's morphology, three-dimensional surface topography and corrosion thickness reduction. According to the order of the laminar zone, the wall jet zone and the transition zone, the corrosion product is thinned, degraded and even removed from the steel surface because of the continuous increasing of wall shear stress, which will decrease the mass transfer resistance, accelerate the mass transfer rate, and continuously enhance the corrosion process of the steel. Therefore, in the order of the laminar zone, the wall jet zone and the transition zone, the structure of the corrosion product changes from complete and compact to loose and porous, the three-dimensional morphology of the substrate surface changes from flat to steep, the average roughness and the root mean square as well as the average corrosion thickness reduction and the standard deviation gradually increase. The corrosion rate and the wall shear stress can be correlated properly with the exponential relationship.

     

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