桥架接头1) pit corrosion depth
In combination with corrosion analysis, especially with the pit corrosion analysis, a model for calculating collecting line pit corrosion depth and a model for statistically predicting the leak off in the collecting line caused by pit corrosion are established on the basis of corrosion investigation.
以腐蚀分析特别是局部点蚀分析为基础,以腐蚀调查为依据,建立了集油管道点蚀深度的统计模型,以及集油管道点蚀泄漏的统计预测模型。 2) maximum pit depth
最大点蚀深度
Based on the corresponding pitting corrosion mechanics and Melchers pitting corrosion model, a simplified maximum pit depth model is proposed, which will be more concisely to predict the statistical characteristics of maximum macro-pit depth.
此外氯仿沸点
,依据青岛、厦门、榆林海域碳钢试验数据,文中还对海水环境因素,如:溶解氧浓度、平均温度、盐度、PH值等,以及钢材成分变化对新型最大点蚀深度模型各参数的影响进行了初步探讨,得出了相应的函数关系式及相关结论。 3) pitting
点蚀
The effects of two types of electrode pitting morphologies,ring type and hole type on resistance spot welding of aluminum alloy 5182 were investigated by the combination of finite element analysis and physical modeling methods.
采用有限元分析和物理模拟相结合的方法,研究了环形和孔形两种电极点蚀形貌对铝合金AA5182电阻点焊的影响。 2.Results show that the material is 316 stainless steel,and the failure was due to pitting induced by chloride which was enriched from the enviroment in the medium in local areas of it.
针对某炼油厂加氢裂化装置中的循环氢压缩机出口仪表引压管的氢泄漏事故,对该管的材料成分、金相组织、腐蚀状况、裂纹及断口等进行了分析.结果表明,该管的材质为316不锈钢;失效原因是由于在其管外壁的局部环境中氯化物的富集而发生点蚀,进而引发管子应力腐蚀开裂,最终造成管内氢气的泄漏
3.On the other hand,it is demonstrated that pitting sensitivity of Al-6Mg-Zr-Sc alloy in the SRB solution is decreased and its microbiologically influenced corrosion r.
muhdpe合金管结果表明,添加Sc元素后,合金的氧化膜更加致密,具有更好的保护作用,使电极开路电位正移100 mV左右,同时Sc元素的加入降低了材料在SRB菌液中的点蚀敏感性,使材料耐微生物腐蚀性能得到提高,但是添加Sc后的合金对SRB更加敏感。
4) pitting corrosion
点蚀
A computational method,FEM is adopted to calculate the collapse load of pressurized elbow with pitting corrosion,by taking the immense deformation effects and stress stiffeni
ng into consideration.
应用有限元分析软件ANSYS,对含点蚀缺陷的弯管在内压载荷作用下进行有限元分析,分析中考虑材料非线性和几何非线性,根据腐蚀区的载荷-应变图,对模型的塑性极限压力进行了预测,得出了缺陷尺寸对塑性极限载荷的影响及变化规律,并得到了一些对含缺陷弯管的安全评定有参考价值的结论。
The effect of heat treatment on pitting corrosion and intergranular corrosion of 0Cr18Ni9Ti was studied by oxalic acid electrolyte test combined with metallographic analysis and potentiodynamic polarization measurement.
用草酸电解实验结合金相观察以及动电位极化法研究了不同热处理工艺后0Cr18Ni9Ti不锈钢的耐晶间腐蚀和耐点蚀性能.结果表明,单一固溶处理后试样具有较好的耐点蚀性,稳定化处理后虽然具有很好的抗晶间腐蚀性能自行车儿童座椅,但是耐点蚀性较差.同时,采用交流阻抗测试研究发现固溶处理后试样表面钝化膜比较稳定
The pitting corrosion of 304 and 316 stainless steels has been studied by monitoring the
evolution process of corrosion current with temperature in NaCl solutions with different concentration under constant applied potentials.
采用外加恒定电位下腐蚀电流-温度扫描的方法分别研究了304、316不锈钢在不同浓度NaC l水溶液中的临界点蚀温度.得到了材料临界点蚀温度随编织袋折边器C l-浓度变化的关系曲线.在分析温度与C l-浓度分别对钝化膜影响的基础上阐述了二者对不锈钢点蚀的综合作用机理
pit corrosion
点蚀
1.The tests reveal that the corrosion damage is caused by the pit corrosion of chlorine ions.
试验证明,腐蚀破坏是氟离子的点蚀造成的,并指出对不锈钢作阳极氧化处理后耐蚀性增强,并建议使用含钼较高的1Cr18Ni9TiMo不锈钢作搅拌桨。
2.The detailed analysis of contusion failure of FCC main fractionator overhead recycle oil
heat exchanger tubes,concludes that the corrosion of external wall of heat exchanger is mainly the comprehensive corrosion of H_2S-HCl-NH_3-H_2O while the internal corrosion is main- ly the pit corrosion by chlorine ion and oxygen depolarization.
文章对催化裂化装置分馏塔顶循环油换热器管束腐蚀穿孔原因进行了详细分析,指出换热器管外壁的腐蚀主要是H_2S-HCl-NH-3-H_2O型的全面腐蚀,管内壁主要是氯离子及氧的去极化引起的点蚀。
3.Stress corrosion cracking and pit corrosion of steam generators in Tianwan Nuclear Power Plant is described,The cause of corrosion is preservation method which is not correct during transportation and installation,measurement and suggestions for safe operation of steam generator is proposed.
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