材料期刊网

MECHANISM RESEARCH ON MECHANICS PROPERTIES’FLUCTUATION OF 67CrVA PATENTED SPRING STEEL WIRE

Z.T. Yang , X.Q. Xing , H.Y. Wang and S.L. Tao Departmentof Research and Design , Research Institute of Steel Wire and Wire Products , Zhengzhou 450007 , China

金属学报(英文版)

Advanced TEMand SEMexperimenteinstrumentshave been used to analysethe Φ4 5 m m , 67 CrVAspringsteel wire, which hasbeen patented underthe processof920℃×3 15 min + (500 ～600)℃×2 min. The mechanics properties’fluctuation and corresponding mi crostructure featuresof which havebeenstudied.

关键词: CrVAsteel wire , null , null

Corrosion of Y, Fe and Fe-15Y in H_2-H_2S Mixture under 10~(-3) Pa S_2 at 600～800℃

Yan NIU , Weitao WU and Chaoliu ZENG (State Key Lab. for Corrosion and Protection , Institute of Corrosion and Protection of Metals , Chinese Academy of Sciences , Shenyang 110015 , China)F. Gesmundo and F. Viani (Instituto di Chimica , Facolta di Ingegneria , Un

材料科学技术（英文）

The corrosion of an Fe-based alloy containing 15 wt pct Y in H2-H2S mixtures under 10-3 Pa S2 was studied at 600~800℃ in an attempt to find materials with improved sulphidation resistance with respect to pure Fe. The presence of Y has been shown to be beneflcial, but not sufficient to the level expected. In fact, the alloy is able to form at all tested temperatures an external FeS layer, beneath which a zone containing a mixture of the two sulphides is also present. Thus,Fe can still diffuse through this region to form the outer FeS layer with non-negligible rate. The corrosion rate of Fe is considerably reduced by the Y addition. but the alloy corrodes still much more rapidly than Y. The sulphidation kinetics is generally rather irregular for both the pure metals, while the corrosion rate of the alloy decreases with time and tends to become parabolic after an initial period of 12~17 h. The sulphidation behaviour of the alloys is discussed by taking into account the presence of an intermetallic compound Fe17Y2 and the limited solubility of Y in Fe

关键词:

Corrosion of Y, Fe and Fe-15Y in H-2-H2S mixture under 10(-3) Pa S-2 at 600 similar to 800 degrees C

材料科学技术（英文）

The corrosion of an Fe-based alloy containing 15 wt pet Y in H-2-H2S mixtures under 10(-3) Pa S-2 was studied at 600 similar to 800 degrees C in an attempt to find materials with improved sulphidation resistance with respect to pure Fe. The presence of Y has been shown to be beneficial, but not sufficient to the level expected. In fact, the alloy is able to form at all tested temperatures an external FeS layer, beneath which a zone containing a mixture of the two sulphides is also present. Thus, Fe can still diffuse through this region to form the outer FeS layer with non-negligible rate. The corrosion rate of Fe is considerably reduced by the Y addition, but the alloy corrodes still much more rapidly than Y. The sulphidation kinetics is generally rather irregular for both the pure metals, while the corrosion rate of the alloy decreases with time and tends to become parabolic after an initial period of 12 similar to 17 h. The sulphidation behaviour of the alloys is discussed by taking into account the presence of an intermetallic compound Fe17Y2 and the limited solubility of Y in Fe.

关键词: high-temperature sulfidation;most-reactive component;ni-nb alloys;h2-h2s mixtures;behavior;600-degrees-c-800-degrees-c;oxidation

SULFIDATION OF Co-15wt%Y ALLOY IN H_2-H_2S MIXTURES AT 600-800℃

NIU Yan , F.GESMUNDO , WU Weitao , ZENG Chaoliu , F.VIANI , (State Key Laboratory for Corrosion and Protection , Institute of Corrosion and Protection of Metals , Chinese Academy of Sciences , Shenyang.110015 , China)(Istituto di Chimica , Facolta'di Ingegneria , Universita'di Genova , Fiera del Mare , Pad.D , 16129 Genova , Italy)Manuscript received 3 July 1995

金属学报(英文版)

The corrosion properties of a Co-15wt% Y alloy were studied in H_2-H_2S mixtures under a sulfur pressure of 10-3 Pa at 600-800℃ and of 10-2 Pa at 800℃ to examine the effect of Y on the resistance of pure cobalt to sulfur attack at high temperatures.The alloy is nearly single-phase.containing mostly the intermetallic compound Co17Y2 plus a little amount of the solid solution of Y in cobalt.At 600-700℃ and at 800℃ under 10-2 Pa of S2 the alloy forms multi-layered scales consisting of an outer region of pure cobalt sulfide,an intermediate region of a mixture of the sulfides of the two metals and finally an innermost layer of a mixture of yttrium sulfide with metal cobalt.At 800℃ under 10-3Pa of S2,below the dissociation pressure of cobalt sulfide, the alloy forms only a single layer composed of a mixture of metallic cobalt with yttrium sulfide.Pure Y produces only the oxysulfide Y2O2S, as a result of the good stability of this compound and of the presence of some impurities in the gas mixtures used The corrosion kinetics is generally rather complex and irregular except al 800℃under 10-3 Pa of S2.The addition of yttrium always reduces the sulfidation rate of cobalt, even though the formation of a continuous protective external layer of yttrium sulfide is never achieved.The internal sulfidation of Y in Co-15% Y is not associated with a depletion of Y in the alloy.This kind of diffusionless internal attack is typical of alloys with a very small solubility of the most reactive component Y in the base metal A.which restricts severely the Y flux from the alloy towards the alloy-scale interface.

关键词: :cobalt-yttrium alloy , null , null

L80钢在CO2/H2S腐蚀环境中的力学特性

林海 , 许杰 , 范白涛 , 张羽臣 , 王桂萍 , 霍宏博 , 殷启帅

表面技术 doi:10.16490/j.cnki.issn.1001-3660.2016.05.014

目的：研究L80钢在CO2/H2S环境中的力学特性。方法利用微机控制慢应变速率拉伸试验机，对特定腐蚀条件下的L80钢试样进行拉伸实验，分析各因素对L80钢力学特性的影响变化规律。结果在CO2/H2S环境中，随着含水率的增加，L80钢的屈服强度、抗拉强度、延伸率均下降，L80钢拉伸曲线出现劣化。随预拉应力的增大，L80钢的屈服强度变化不明显，而抗拉强度和延伸率降低，当预拉应力超过0.8σs时，L80钢的腐蚀速率显著增加，表现出较强的应力腐蚀敏感性；随着H2S分压的增加， L80钢的力学性能发生劣化，表现出氢脆敏感性，而受CO2分压的影响不明显；温度升高导致L80钢的拉伸曲线出现了轻度劣化，延伸率和屈服区宽度小幅降低，但抗拉强度变化不大。结论 L80钢在CO2/H2S环境中的力学特性受温度、CO2分压影响程度小。含水率和预拉应力的增大降低了L80钢的力学韧性，预拉应力的存在使L80腐蚀速率加快，缩短了耐腐蚀寿命。L80钢的力学性能对于H2S分压较对CO2分压更为敏感，试样的断裂是机械拉力和应力腐蚀共同作用的结果。

关键词: L80钢 , CO2腐蚀 , H2S腐蚀 , 力学特性 , 腐蚀速率 , 应力腐蚀

L360钢在H₂S/CO₂环境中腐蚀的预测

赵景茂 , 魏辉荣 , 张娇娇 , 熊金平 , 唐聿明 , 左禹

腐蚀学报（英文）

运用BP人工神经网络技术建立了预测L360钢在H₂S/CO₂环境中腐蚀的模型,神经网络拓扑结构为5-4-1, 网络模型训练成功以后,应用它预测L360钢在H₂S/CO₂中的腐蚀速度. 结果表明,人工神经网络模型预测的结果与实验数据相当符合, 误差在14%以内.由此可见,BP神经网络模型可以作为预测H₂S/CO₂环境致集输管线腐蚀速率的工具.

关键词: L360钢 , H₂S/CO₂ corrosion , BP artifical neural network , corrosion rate

L80油管钢在CO2/H2S环境中的腐蚀行为

林海 , 许杰 , 幸雪松 , 范白涛 , 杨进 , 王晓鹏

表面技术 doi:10.16490/j.cnki.issn.1001-3660.2016.05.013

目的：研究L80油管在CO2/H2S环境中的腐蚀行为。方法利用扫描电镜（SEM）、EDAX能谱分析L80油管内壁腐蚀产物形貌特征和化学组成，采用高温高压反应釜，以实际油水分离的水样为腐蚀介质进行模拟实验，研究原油含水率、CO2/H2S 分压和温度对 L80油管腐蚀速率的影响规律。结果在CO2/H2S环境中，L80油管内壁呈现明显的局部腐蚀特征，部分表面点蚀坑深度超过100μm，形成FeS、FeCO3等腐蚀产物。随着含水率的增加，L80油管腐蚀速率逐渐增大，含水率为30%时的腐蚀速率为0.0377 mm/a，含水率为100%时的腐蚀速率为0.0952 mm/a。CO2分压不变时，随着 H2S分压的增加，L80钢的腐蚀速率增大，H2S分压为0.04 MPa时的腐蚀速率为0.0377 mm/a，H2S分压为0.3 MPa时的腐蚀速率为0.0952 mm/a；H2S分压不变时，随着CO2分压的增大，L80钢腐蚀速率变化不明显且腐蚀速率较小。随着温度的升高，腐蚀速率先以较大幅度增大，再以较小幅度减小，从40℃增加至100℃时，腐蚀速率由0.0083 mm/a升至0.1264 mm/a，100℃左右时的腐蚀速率最大，120℃对应的腐蚀速率为0.106 mm/a。结论 L80油管在CO2/H2S环境中以均匀腐蚀和局部点蚀为主。L80油管腐蚀速率对H2S分压比CO2分压更敏感，CO2分压增大促使具有良好保护性的FeCO3保护膜的形成，降低了腐蚀速率。温度升高至一定范围，导致碳酸盐等难溶性盐溶解度降低，并覆盖在钢表面形成保护层，从而使腐蚀速率下降。

关键词: L80油管钢 , CO2/H2S腐蚀 , 腐蚀产物 , 腐蚀速率 , 腐蚀形貌 , 影响因素

饱和H₂S对316L不锈钢腐蚀电化学行为的影响

唐俊文 , 邵亚薇 , 张涛 , 孟国哲 , 王福会

中国腐蚀与防护学报

利用极化曲线和电化学阻抗谱（EIS），结合电化学噪声（EN）技术研究了316L不锈钢在80℃ H₂S-HCl-H₂O环境下的腐蚀电化学行为，利用散粒噪声理论并结合统计方法分析了其腐蚀过程及其腐蚀发展趋势。结果表明，饱和H₂S 的存在使316L不锈钢的钝化区消失，加速了腐蚀；使钢腐蚀的频率加大，且更容易产生严重的腐蚀。

关键词: 316L不锈钢 , H₂S , corrosion , EN

H₂S/CO₂环境中L360钢点蚀行为研究

李挺 , 刘德绪 , 龚金海 , 徐新波 , 赵景茂 , 左禹

腐蚀学报（英文）

利用静态挂片失重法研究了含H₂S/CO₂模拟油田水溶液中, 温度及Cl^-浓度对L360管线钢点蚀的影响, 并利用Gumbel第一类近似函数分析了最深蚀孔概率. 结果表明, 在40℃~70℃之间, Cl^-浓度为10 g/L条件下, 点蚀的严重程度随温度增高而增大. 恒定温度下, Cl^-浓度对点蚀发生也有明显的影响, 当Cl^-在10×15 g/L范围时, 腐蚀试样发生明显的点蚀; 当Cl^-浓度大于20 g/L时, 试样主要发生均匀腐蚀, 随着Cl^-浓度的增大, 腐蚀产物膜变得更加疏松, 保护性能下降, 均匀腐蚀速率增大. 最深点蚀分布服从Gumbel第一类近似函数.

关键词: H₂S/CO₂环境 , pipeline steel , pitting corrosion , chlorine ion , temperature , statistical analysis

H2S／CO2环境中L360钢点蚀行为研究

李挺 , 刘德绪 , 龚金海 , 徐新波 , 赵景茂 , 左禹

腐蚀学报（英文）

利用静态挂片失重法研究了含H2S／CO2模拟油田水溶液中，温度及Cl^-浓度对L360管线钢点蚀的影响，并利用Gumbel第一类近似函数分析了最深蚀孔概率．结果表明，在40℃-70℃之间，Cl^-1浓度为10g／L条件下，点蚀的严重程度随温度增高而增大．恒定温度下，C1^-1浓度对点蚀发生也有明显的影响，当Cl在10-15g／L范围时，腐蚀试样发生明显的点蚀；当Cl^-浓度大于20g／L时，试样主要发生均匀腐蚀，随着Cl^-浓度的增大，腐蚀产物膜变得更加疏松，保护性能下降，均匀腐蚀速率增大．最深点蚀分布服从Gumbel第一类近似函数．

关键词: H2S/CO2环境 , 管线钢 , 点蚀 , 氯离子 , 温度 , 统计分析