Sb对低合金钢在油船货油舱上甲板环境下耐蚀性的影响

通过自主设计腐蚀模拟试验装置、冷场发射扫描电镜及EDAX能谱分析系统、激光拉曼光谱分析仪、电子探针和X射线光电子能谱仪等手段,模拟油船货油舱上甲板环境,研究分析了Sb元素对低合金钢在含CO2-SO2-O2-H2S气体干湿交替环境中耐蚀性的影响.结果 表明:Sb元素可以有效降低钢在上甲板环境中的腐蚀减薄量,含Sb钢内锈层...     

N80油套管钢CO_2腐蚀产物膜的形成过程分析

在模拟油田井的高温环境下,研究分析了N80钢在采出液(主要是CO2水溶液)中的腐蚀行为.用光学显微镜、SEM、XRD对N80钢的腐蚀产物膜的表面形貌、横截面形貌、结构及成分进行了分析.探讨了N80钢腐蚀产物膜的形成原因和发展过程.结果表明,N80钢表面腐蚀产物膜有三层大小和致密程度不同的FeCO3晶体组成,内层致密度高,外层疏松.     

高含H2S和CO2环境中L80钢的腐蚀规律

 采用失重腐蚀方法研究了在模拟气田井下腐蚀环境中腐蚀影响因素(总压力、温度、腐蚀时间、H2S、Cl-、溶液流速),对套管钢(L80)腐蚀的影响规律,并用扫描电镜分析了腐蚀产物膜形貌。结果表明：60 ℃为L80钢在H2S+CO2腐蚀环境中的腐蚀临界温度,此时,L80钢的腐蚀速率最小;当总压力大于等于9 MPa,温度为120 ℃,H2S、CO2达到各自的超临界点,L80钢的腐蚀速率比温度为90 ℃时小;随腐蚀时间延长,腐蚀速率明显下降;相对在单一的CO2环境下,引入H2S可降低腐蚀速率;Cl-可促进L80钢的腐蚀;溶液流速加快,腐蚀速率提高。     

Cr对改善低合金钢抗CO2腐蚀性能的影响

研究了不同Cr含量的低合金钢在模拟不同油田CO2腐蚀环境下的抗CO2腐蚀性能,并对Cr元素改善钢的抗CO2腐蚀行为及机理进行了分析.     

耐蚀钢中铜元素对耐蚀性的影响规律探讨

采用浸泡腐蚀试验、锈层XRD分析、环境扫描显微镜(SEM)和电化学分析等方法,研究了不同Cu含量的油轮耐蚀钢在模拟原油船货油舱环境下的腐蚀规律和机理。结果表明:Cu含量增加,油轮钢耐腐蚀性能增加;短期浸泡腐蚀过程中,铜元素的加入可显著提高腐蚀电位、降低腐蚀电流密度;长周期浸泡腐蚀过程中,铜元素改善了产物膜结构和致密度,提高了与基体的结合度,从而有效抑制了基体的进一步腐蚀,提高了低合金钢长周期浸泡的耐蚀性能。     

低铬抗硫套管的H_2S/CO_2腐蚀行为研究

通过高温高压及H2S应力腐蚀开裂(SSC)实验,采用SEM、EDS、XRD和TEM技术,研究3Cr110S在模拟环境中的H2S/CO2腐蚀行为。结果表明:在模拟H2S/CO2高温高压腐蚀环境中,H2S腐蚀占主导作用,3Cr110S的均匀腐蚀速率为0.1272 mm/a,局部腐蚀轻微,试样表面腐蚀产物为FeS;在施加应力为72%、80%的最低屈服强度时,3Cr110S试样均未发生应力腐蚀开裂,具有良好的抗SSC性能;3Cr110S回火索氏体组织的条束之间位相差大,铬元素在晶界及晶内以粒状碳化物析出、位错纠结、弥散分布碳化物的位错定扎对SSC裂纹扩展起着良好的阻碍作用。     

经济型抗CO2腐蚀油套管用低合金钢的研究

在油套管CO2腐蚀失效分析基础上,研究了不同成分和组织钢在模拟不同油田采出液介质中的抗CO2腐蚀性能和腐蚀行为.针对油田特定的腐蚀环境,优选出抗CO2、Cl-腐蚀性能良好的经济型低合金钢种.     

CO2分压对油管钢CO2/H2S腐蚀的影响

采用高温高压釜、失重法和扫描电镜，对不同CO2分压(310．2642、930．7926、1551．3210、2171．8494kPa)条件下油管钢N80和P110的CO2／H2S腐蚀进行了研究。结果表明，随着CO2分压的升高，两种钢的CO2／H2S腐蚀速率均单调增加；除了CO2分压极低的情况以外，P110钢的腐蚀速率总是大于N80钢。     

Fe_3Al及不锈钢多孔材料在含H2S气氛中的腐蚀试验研究

随着洁净煤技术在中国的快速发展,高温H2S环境下的除尘技术及材料得到越来越高的重视。测试并分析了Fe3Al及不锈钢多孔材料在H2S环境下的腐蚀增重及孔隙渗透性的变化,并采用扫描电镜观察腐蚀后的微观形貌,从而评价材料的耐蚀性能。结果表明:经过1 500 h试验,Fe3Al多孔材料在2%H2S(体积分数)浓度下具有优良的耐蚀性能;不锈钢材料耐蚀性较差,其产生的腐蚀产物容易堵塞孔隙,导致孔径与渗透性的大幅度下降。能谱分析与X射线衍射结果表明,Fe3Al表面基本未形成含S的腐蚀产物,而316L不锈钢表面形成了以Fe S为主的含S腐蚀产物。     

AZ31镁合金在海洋大气环境中的腐蚀行为

通过室外大气暴露试验,研究了AZ31镁合金在万宁和青岛2个海洋大气环境试验站点1～5年的腐蚀规律,用失重法测定了腐蚀速率,并用SEM和XRD分析了5年后表面腐蚀形貌和腐蚀产物的组成。研究表明,AZ31镁合金暴露在海洋大气环境5年后的腐蚀动力学符合幂函数规律,万宁站的腐蚀速率高于青岛站,且腐蚀速率都随暴露时间的延长而降低,但青岛站腐蚀速率降低幅度更大,腐蚀产物膜对基体保护作用较万宁站强;AZ31镁合金暴露在万宁站和青岛站5年后的腐蚀速率分别为37.6和13.5μm·a-1,腐蚀产物以MgCl2,MgCO3,MgSO3,MgSO4,Mg5(CO3)4(OH)2·8H2O和Mg2(OH)3Cl·4H2O为主;AZ31镁合金在海洋大气环境中不耐腐蚀,表面布满点蚀坑,相对湿度对镁合金较长周期的腐蚀有显著影响。     

基于IMO标准的船用耐蚀钢检测技术研究与应用

对国际海事组织(IMO)规定的货油舱耐蚀钢腐蚀性能标准及检测技术条件进行了分析,详细介绍了自主研发的上甲板、内底板腐蚀评价装置的性能指标和试验情况。结果表明,在精确控制试样循环温度和水温基础上研制的检测装置,各项技术参数可以满足IMO的相关规定,为国产耐蚀钢及其配套型材、焊材的腐蚀评价提供了设备保证,标志着中国已经完全掌握了IMO标准化的船用耐蚀钢腐蚀检测技术。     

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The corrosion environment of cargo oil tank (COT) was simulated according to performance standard for corrosion resistant steel of IMO in this paper, to study the corrosion behavior of two different ship hull steel on the upper deck of COT. The results showed general corrosion in wet-dry environments contained H2S, the corrosion rate of conventional E36 steel reached 0??4mm/a. The addition of Cu and Ni improved the formation of the stable phase ??-FeOOH, which decreased the defect in the rust and made the rust more compact. Inclusions such as CaO and CaS formed in the Ca treated ship steel, which dissolved under the corrosion media and alkaline product generated, the alkaline product increased the pH value of the liquid film on the surface of steel and slowed down the corrosion rate of steel.     

Corrosion Behavior of 110S Tube Steel in Environments of High H2S and CO2 Content

 The corrosion behavior of the 110S tube steel in the environments of high H2S and CO2 content was investigated by using a high-temperature and high-pressure autoclave, and the corrosion products were characterized by scanning electron microscopy and X-ray diffraction technique. The results showed that all of the corrosion products under the test conditions mainly consisted of different types of iron sulfides such as pyrrhotite of Fe0. 95S, mackinawite of FeS0. 9, Fe0. 985S and FeS, and the absence of iron carbonate in the corrosion scales indicated that the corrosion process was controlled by H2S corrosion. The corrosion rate of the 110S steel decreased firstly and then increased with the rising of temperature. The minimum corrosion rate occurred at 110 ℃. When the H2S partial pressure PH2S below 9 MPa, the corrosion rate declined with the increase of PH2S. While over 9 MPa, a higher PH2S resulted in a faster corrosion process. With the increasing of the CO2 partial pressure, the corrosion rate had an increasing trend. The morphologies of the corrosion scales had a good accordance with the corrosion rates.     

Investigation of Mechanical Property of Oil Tube Steel P110S in High Temperature and High Pressure Environment Containing H2S/CO2

With the exploitation of high sour and deep oil well in china,the corrosion medium containing CO 2,H 2 S,Cl-and organic acid threaten the safety of oil equipment and tube steel severely.In this article,many experiments,including corrosion tests,tensile tests,hydrogen concentration measurement tests and SEM examinations,were performed to investigate the effect of H 2 S partial pressure and loading stress on the mechanical property of oil tube steel P110S in high temperature and high pressure environment containing H 2 S/CO 2.The tensile strength and yield strength during fracture process of P110S steel were obtained experimentally and the fracture morphology was analyzed by SEM.The results indicate that both tensile strength and yield strength decreased after corrosion.The damage of tensile strength and yield strength became serious with an increase in H 2 S partial pressure and loading stress.According to the fracture analysis,the fracture mode exhibited quasi-cleavage and dimple mixed fracture,and the area of quasi-cleavage pattern increased with H 2 S partial pressure and loading stress increasing.According to the results of tensile test and hydrogen concentration measurement test,the tensile property degradation is closely associated with diffusible hydrogen concentration of P110S steel in the H 2 S/CO 2 environment.     

pH值对货油舱用耐蚀钢腐蚀特性的影响

针对油轮货油舱底部的高氯离子强酸性腐蚀环境,参照了IMO《货油舱用耐蚀钢实验程序》的要求,深入研究了腐蚀溶液的pH值对其腐蚀特性的影响,对比分析了普通E36级船板钢以及等强度级别的耐蚀船板钢腐蚀行为的差异.研究结果表明,pH值对钢的腐蚀速率有显著影响.pH＜3.0时,耐蚀钢的耐腐蚀性能,尤其是耐点蚀性能明显优于传统钢;pH≥3.0时,耐蚀钢和传统钢的腐蚀速率未表现出明显差异.强酸性氯离子环境下,实验钢的纯净度、微量耐蚀合金设计、显微组织共同决定了其耐腐蚀性能.钢中的非金属夹杂物是诱发局部腐蚀的主要原因;Cu、Ni、Sn元素的复合添加能显著提高耐蚀钢的腐蚀电位,同时耐蚀合金元素在锈层内部富集,提高了耐蚀钢表面锈层的致密性与稳定性;单一均匀的贝氏体显微组织有利于提高实验钢在酸性氯离子环境下的耐蚀性能,这主要是由于贝氏体组织中富碳相较少且分布均匀.     

钛表面钛钯合金层耐蚀性能及耐蚀机理研究

采用磁控溅射沉积钯膜层+热扩散技术在工业纯钛表面制备Ti-Pd合金层,研究了Ti-Pd合金层的耐蚀性能,用重量法评价了合金层的腐蚀速率,分析了不同样品经腐蚀后的表面形貌和成分。结果表明:Ti-Pd合金层在37%(质量分数,下同) HCl溶液和80%H_2SO_4溶液中的腐蚀速率比纯钛降低了2个数量级。Ti-Pd合金层经37%HCl腐蚀后,表面含有Ti、Pd、O元素,表面有微小的点蚀坑。Ti-Pd合金层经80%H_2SO_4腐蚀后,表面含有Ti、Pd、S、O元素,表面有亚微米级的点蚀坑。提出了Ti-Pd合金层的耐蚀机理:微量的Pd和Ti O2组成的钝化膜使表面腐蚀电位提高,产生耐蚀效果。     

Influence of Inclusion on Corrosion Behavior of E36 Grade Low-alloy Steel in Cargo Oil Tank Bottom Plate Environment

Corrosion behavior of low-alloy steel was investigated in simulated cargo oil tank （COT） bottom plate service environment （10% NaCl solution, pH = 0.85）. The corrosion behavior of inclusion was studied by in-situ scanning electron microscopy （SEM） and energy dispersive spectroscopy （EDS）. It was found that pitting corrosion was inclined to occur around the place where inclusions exist. After initial corrosion, an area of 10-20μm in diameter was formed as a cireinate cathode around the edge of inclusion. MnS inclusion dissolved in the simulated COT corrosion solution before low-alloy steel matrix, and pitting was formed at the place where MnS dissolved. TiO2 inclusion dissolved in the simulated COT corrosion solution after low alloy steel matrix, and pitting was formed at the place where steel matrix dissolved. The corrosion tended to occur at the area where the curvature radius of inclusion is smaller. The size of round TiO2 inclusions had little influence on corrosion behavior in this certain environment.     

Effect of CO2 partial pressure on corrosion of 3Cr steel in high temperature steam environment

To study the effects of CO2 pressure on 3Cr steel in the high temperature steam environment. The corrosion tests were conducted in a HTHP autoclave to simulate the CO2 auxiliary steam drive. 3Cr steels were subjected to weight loss test under the condition of CO2 partial pressure range of 1-4MPa at 160??. The corrosion morphology and product composition were explored by SEM, EDS, XRD and XPS. The results show that the corrosion rate of 3Cr steel is lower than the corrosion control line of oil field (0. 076mm/a). With the increase of CO2 partial pressure, the corrosion rate firstly increases and then decreases. When the CO2 partial pressure is 1-2MPa, the FeCO3 generated by corrosion process gradually deposits on the surface of steel, and the number of FeCO3 crystals gradually increases. When the CO2 partial pressure is 3-4MPa, a small amount of FeCO3 crystals in the corrosion products dissolves, and the corners of FeCO3 crystals become rounder and the corrosion products become more compact. The results show that CO2 partial pressure mainly affects the deposition and dissolution of FeCO3 in the high temperature steam containing CO2 environment, which influences the protective properties of 3Cr steel corrosion products, thus further affecting the corrosion rate.