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溫度對3%Cr管線鋼CO2腐蝕產物膜的影響

Effect of temperature on CO2 corrosion production scales on 3%Cr pipeline steel

  • 摘要: 經濟型低Cr合金鋼具有較好的抗CO2腐蝕性能,利用高溫高壓反應釜研究了3%Cr管線鋼的CO2腐蝕行為,采用X射線衍射(XRD)、掃描電鏡(SEM)和能譜儀(EDS)等對腐蝕產物膜的微觀形貌、化學成分以及結構進行分析,探討了溫度對3%Cr管線鋼腐蝕產物膜的影響.結果表明,CO2分壓0.8 MPa、液體流速1.0 m.s-1時,在40~140℃范圍內,3%Cr管線鋼均未發生局部腐蝕,其平均腐蝕速率呈先升高后降低的趨勢,峰值溫度在100℃左右.3%Cr管線鋼的腐蝕產物膜具有兩層結構:內層膜為致密的富Cr層(Cr富集程度可高達Cr/Fe=8/5),主要由含Cr化合物和非晶態FeCO3構成,并隨著溫度的升高,Cr富集程度增加,內層膜厚度降低;外層膜則由晶態FeCO3堆積而成.

     

    Abstract: Economic low-chromium steels show superior resistance to CO2 corrosion.The corrosion performance of 3%Cr pipeline steel was studied with a high-temperature and high-pressure autoclave.In a CO2 environment,X-ray diffraction(XRD),scanning electron microscopy(SEM) and energy-dispersive spectrometry(EDS) were used to analyze the morphologies and characteristics of corrosion production scales on 3%Cr steel.The formation of the scales at different temperatures was also discussed.The results show that when the CO2 partial pressure is 0.8 MPa and the flow velocity is 1.0m·s-1 within the temperature range of 40 to 140℃,the average corrosion rate first increases and then decreases with increasing temperature,and its maximum can be obtained at about 100℃.For all the test conditions no localized corrosion was observed.There is a two-layer structure in the scales.The inner layer,which is mainly composed of Cr compounds and amorphous FeCO3,is denser and more stable because of Cr enrichment.The Cr content of the inner layer increases with increasing temperature and the mass ratio of Cr to Fe can reach 8/5.The outer layer is formed from the precipitation of crystalline FeCO3.

     

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