第36卷第2期（2017.02）技木纵横
含硫原油对不同管材顶部腐蚀行为的影响魏彦方彭浩平1.2
刘军，程雅雯1赵会军1孙晚需
摘要：采用高温腐蚀试验箱模拟输油管道的环境，分别研究了义65钢和80钢在含硫原油中不同温度条件下的腐蚀行为。利用扫描电子显微镜（SEM）、能谱仪（EDS）和义射线衍射（义RD）等分析手段来表征离蚀产物膜的宏观、微观形貌结构及成分，并辅以失重法计算试样的腐蚀速率。结果表明，试样顶部与底部腐蚀形态明显不同，底部腐蚀主要为点蚀，而顶部受腐蚀产物膜的影响呈台地腐蚀。试样顶部腐蚀产物膜脱落的位置与腐蚀严重的部位一致，蚀产物膜对试样有一定的保护作用。在30～80℃范图内，试样的离蚀速率均随温度的升高先增大后减小，在测试温度下义80钢表现出较好的耐腐蚀性。
关键词：顶部腐蚀；X65钢；X80钢；温度；腐蚀产物膜；腐蚀速率 Doi:10.3969/j.issn.10066896.2017.2.021
Effectsof Sour CrudeOil onCorrosionBehavior of Different SteelattheTop ofthePipe Wei Yanfang,Peng Haoping, Liu Jun,Cheng Yawen,Zhao Huijun, Sun Xiaoyu
Abstract: The corrosion behavior was investigated by using a hightemperature corrosion test case in order to simulate the corrosion environment of oil pipeline. The corrosion behaviors of X65 and X80 steel in sour crude oil under various temperature conditions were investigated respectively. The corro sion products were studied by scanning electron microscope (SEM), energy dispersive spectrometer(EDS) and Xray diffraction (XRD) to analyze the structure shape of the macro and micro morphol ogy of corrosion product film and composition of corrosion product scale. The corrosion rate was cal culated by weight loss method. The results demonstrate that the corrosion forms of top of the line and bottom of the line have obvious difference. The corrosion at the bottom is mainly pitting corrosion, and the top of line corrosion affected by corrosion product film show platform corrosion.The position of serious corrosion parts corresponded with the position of localized corrosion after removal of corro sion scales.The corrosion product film has certain protective effect to the sample. In the range of 30 °C ~ 80 C , the corrosion rates of samples all increase with the increasing temperature and then de creases.The X8O steel exhibit the better corrosion resistance in the test temperature.
Key words: top of the line corrosion; X65 steel;X80 steel; temperature; corrosion product film; corrosion rate
随着经济的发展，我国正在逐年增加原油进口力度，进口原油的产区主要为中东地区，其原油的特点是含硫量高、腐蚀性强。在长输管道输送含硫原油过程中，埋地管道通常是多相混输，管道内部高温介质与土壤之间存在明显的温差，导致管道顶部产生大量的凝析水，若管道中的酸性气体（如 COz、H,S等）和挥发性的腐蚀介质（乙酸等）溶于凝析水中并聚集在管道顶部，会导致管道发生严
“基金论文：国家自然科学基金资助项自（51301028）。
重的顶部腐蚀（Top of theLine Corrosion，TLC）-s。在管道运行过程中，顶部腐蚀较其他部位腐蚀明香
管道腐蚀损坏不仅带来巨大的经济间题，还会造成恶劣的社会影响，因此管线钢的顶部腐蚀一直受到特别关注。
输送含硫原油管道的顶部腐蚀主要与CO,和 H,S的含量有关-5。研究含硫原油在管道顶部和底部的腐蚀行为后，主要讨论含硫原油中管道顶部的
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