35CrMo钢在O2、H2S和CO2共存体系中的腐蚀行为研究
Corrosion Behavior of 35CrMo Steel Under O2, H2S and CO2 Mixed System
浏览(1384) 下载(6)
- 引用格式:
-
宋晓琴,王彦然,梁建军,陈龙,周飞龙,王喜悦,刘玲.35CrMo钢在O2、H2S和CO2共存体系中的腐蚀行为研究[J].天然气与石油,2018,36(6):0.doi:
Song Xiaoqin, Wang Yanran, Liang Jianjun, Chen Long, Zhou Feilong, Wang Xiyue, Liu Ling.Corrosion Behavior of 35CrMo Steel Under O2, H2S and CO2 Mixed System[J].Natural Gas and Oil,2018,36(6):0.doi:
- DOI:
- 作者:
- 宋晓琴1 王彦然1 梁建军2 陈 龙2 周飞龙1 王喜悦1 刘 玲1
Song Xiaoqin1, Wang Yanran1, Liang Jianjun2, Chen Long2, Zhou Feilong1, Wang Xiyue1, Liu Ling1
- 作者单位:
- 1. 西南石油大学石油与天然气工程学院,2. 新疆油田工程技术研究院
School of Petroleum and Natural Gas Engineering, Southwest Petroleum University,Chengdu,Sichuan, 610500,China 2. Xinjiang Oilfield Engineering Technology Research Institute, Karamay,Xinjiang, 834000,China
- 关键词:
- 火驱尾气;35CrMo钢;腐蚀产物;O2/H2S/CO2的交互作用
Fire drive off-gas; 35CrMo steel; Corrosion product; Interaction of O2/H2S/CO2
- 摘要:
-
新疆油田的火驱尾气中含有O2、H2S和CO2三种腐蚀性气体。以35CrMo钢为实验材料,基于新疆油田火驱尾气的现场工况,设计正交实验条件;采用失重法测试35CrMo钢的腐蚀速率;结合SEM等手段对典型工况的腐蚀产物进行测试分析。结果表明:35CrMo钢在实验条件下发生均匀腐蚀,气质组成对腐蚀速率的影响最大,其次是温度和总压;产物形态以粒状为主,在含氧条件下有片状产物,较高温度和含氧条件下产物膜厚度较大,产物中有Fe、C、O、S四种元素,并含有Cr元素,既有Fe的硫化物,也有Fe和Cr的氧化物;O2除了参与吸氧反应,还会氧化Fe2+等,也会与H2S发生交互作用生成单质S,与CO2交互作用抑制FeCO3生成。该研究结果为金属材料在O2、H2S和CO2混合体系中的腐蚀机理和防护研究提供了理论基础。
The fire drive off-gas in Xinjiang oilfield contains three types of corrosive gases, namely O2, H2S and CO2.In the paper, 35CrMo steel is selected as experimental material.Orthogonal experiment is designed based on field working conditionsand the corrosion rate is studied by weight loss method.Aimed at typical conditions, corrosion product films are studied by SEM and the like.The findings reveal that general corrosion occurs on the 35CrMo steel under experimental conditions and the composition of gases exerts the greatest impact on corrosion rate,followed by temperature and total pressure in turn.Corrosion product is mainly granular, mixed with platelet when O2is contained.As partial pressure of O2and temperature increasing, corrosion rate become much higher, product film becomes thicker.There are four elements of Fe, C, O, S in corrosion product mainly, Cr was detected as well.Corrosion product consisted of sulfide of Fe and oxide of Fe and Cr.The reason is that besides precipitating in oxygen absorption reaction, O2also oxidizes some product such as Fe2+.Moreover, O2interacts with H2S, generating S, and with CO2, restraining formation of FeCO3.The findings provides research on corrosion mechanism and protection of metallic materials with theoretical basis under O2, H2S and CO2mixed system.
