特石管线腐蚀行为及机理研究
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摘要
利用失重法、动电位极化,结合扫描电子显微镜SEM,研究了不同地域特石管线管段的腐蚀行为,以及主要腐蚀性离子对腐蚀行为的影响规律。研究结果表明:不同地域管段不同区域腐蚀介质中的氯离子和碳酸氢根离子含量越高,特石管线腐蚀速率越大。其中特石管线双台子河水管段腐蚀速率最大,腐蚀最严重,其次是首站外管段腐蚀较为明显,大坝西处管段腐蚀速率最小。不同管段腐蚀行为腐蚀机理相同,均属于阳极溶解的电化学腐蚀,只是由于不同管段环境中的离子浓度不同导致腐蚀速率不同。三种环境模拟溶液中,HCO3-,Cl-均对X52钢腐蚀起促进作用,随着两种离子浓度的增加,腐蚀速率也增加。
The weight loss method, potentiodynamic polarization and scanning electron microscopy(SEM) were used to study the corrosion behavior of Teshi pipeline in different regions and the influence of main corrosive ions on the corrosion behavior. The results showed that the higher the content of chloride ions and bicarbonate ions in the corrosive media in different regions of different sections of the pipeline, the greater the corrosion rate of pipeline. Among them, the pipeline located in Shuangtaizi River water pipe section had the highest corrosion rate and the most serious corrosion,followed by the pipeline located at the outer pipe section of the first station, and the corrosion rate of the pipeline at the west of the dam was the smallest. Corrosion behaviors and corrosion mechanisms of different pipe sections were the same because it belonged to the electrochemical corrosion of anodic dissolution, but due to the different ion concentrations in different pipe sections, the corrosion rates were different. Among the three kinds of environmental simulation solutions, HCO3-and Cl-all promoted the corrosion of X52 steel. With the increase of the two ion concentrations, the corrosion rate also increased.
The weight loss method, potentiodynamic polarization and scanning electron microscopy(SEM) were used to study the corrosion behavior of Teshi pipeline in different regions and the influence of main corrosive ions on the corrosion behavior. The results showed that the higher the content of chloride ions and bicarbonate ions in the corrosive media in different regions of different sections of the pipeline, the greater the corrosion rate of pipeline. Among them, the pipeline located in Shuangtaizi River water pipe section had the highest corrosion rate and the most serious corrosion,followed by the pipeline located at the outer pipe section of the first station, and the corrosion rate of the pipeline at the west of the dam was the smallest. Corrosion behaviors and corrosion mechanisms of different pipe sections were the same because it belonged to the electrochemical corrosion of anodic dissolution, but due to the different ion concentrations in different pipe sections, the corrosion rates were different. Among the three kinds of environmental simulation solutions, HCO3-and Cl-all promoted the corrosion of X52 steel. With the increase of the two ion concentrations, the corrosion rate also increased.
引文
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[11]聂向晖,李云龙,李记科,等.Q235碳钢在滨海盐土中的腐蚀形貌、产物及机理分析[J].材料工程,2010,2010(8):24-28.
[12]郭昊,杜翠薇,李晓刚,等.X70钢在碳酸氢钠溶液中的腐蚀行为研究[J].装备环境工程,2007,4(3):40-44.
[2]Chin D T,Sabde G M.Current Distribution and Electrochemical Environment in a Ca-thodically Pr-otected Crevice[J].Corrosion-Houston Tx-,1999,55(3):229-237
[3]路民旭,白真权.油气采集储运中的腐蚀现状及典型案例[J].腐蚀与防护,2002,23(3):000105-113.
[4]刘智勇,贾静焕,杜翠薇,等.X80和X52钢在模拟海水环境中的腐蚀行为与规律[J].中国腐蚀与防护学报,2014,34(4):327-332.
[5]丁清苗,范玥铭,沈陶,等.机场供油管线X52钢腐蚀的影响因素[J].腐蚀与防护,2016,37(4):345-349.管线腐蚀行为及机理研究925
[6]张军,慕立俊,赵文轸.HCO3-对J55钢在1%NaCl溶液中腐蚀行为的影响[J].腐蚀科学与防护技术,2010,22(3):188-191.
[7]周建龙,李晓刚,张新,等.Cl-对X80管线钢在HCO3-溶液中的电化学行为影响[J].腐蚀与防护,2013(10):865-869.
[8]谷琦琦,简璐,张西雷,等.HCO3-对X80钢在Na Cl溶液中腐蚀性能的影响[J].金属热处理,2015(8):179-183.
[9]张淑雁,梁平,胡传顺,等.库尔勒土壤中阴离子对X80管线钢腐蚀行为的影响[J].腐蚀与防护,2014,35(1):14-17.
[10]许立宁,常炜,覃慧敏,等.X70管线钢在含CO2湿气环境下腐蚀产物膜的生长[J].中国石油大学学报:自然科学版,2012,36(5):146-150.
[11]聂向晖,李云龙,李记科,等.Q235碳钢在滨海盐土中的腐蚀形貌、产物及机理分析[J].材料工程,2010,2010(8):24-28.
[12]郭昊,杜翠薇,李晓刚,等.X70钢在碳酸氢钠溶液中的腐蚀行为研究[J].装备环境工程,2007,4(3):40-44.